Kentucky Wastewater Treatment Plants

The authoritative resource for consulting engineers, utility managers, and municipal decision-makers tracking Kentucky’s wastewater infrastructure landscape.

1. Introduction

Kentucky’s wastewater infrastructure represents a complex dichotomy between the advanced, high-capacity systems of the “Golden Triangle” (Louisville, Lexington, and Northern Kentucky) and the decentralized challenges of the Appalachian and rural western regions. The Commonwealth manages a robust network of treatment facilities overseen by the Kentucky Division of Water (KDOW), ensuring compliance with both the Clean Water Act and specific Ohio River Valley Water Sanitation Commission (ORSANCO) standards.

Currently, Kentucky faces significant engineering challenges related to Combined Sewer Overflows (CSOs) in its historic river cities, requiring multi-billion dollar consent decree investments. Additionally, the state is grappling with unique geological constraints, specifically the extensive karst topography in the south-central region, which complicates conveyance design. With over 4.5 million residents served and a resurgence in industrial manufacturing (particularly in the EV battery sector), the demand for treatment capacity expansion and technological upgrades is at an all-time high.

Among US wastewater treatment plants, Kentucky’s are shaped by a combination that few states carry at once: a heavy inventory of combined sewers concentrated in three metropolitan utilities, all three simultaneously under federal consent decrees; a geology across much of the state in which surface drainage disappears into limestone and reappears somewhere else entirely; and a rural service picture where the binding constraint is rate base and operator availability rather than technology. What that produces is a market split cleanly in two. The three large utilities are executing programs measured in billions against court-ordered deadlines, while several hundred small systems are working on whether they can afford to operate at all. This page indexes every Kentucky facility profiled on the site within that framework.

2. Recent Developments & Projects

In the last 36 months, Kentucky has seen a massive influx of capital directed toward wet weather management and biosolids optimization. The Louisville and Jefferson County Metropolitan Sewer District (MSD) recently completed the massive Waterway Protection Tunnel, a pivotal component of their IOAP (Integrated Overflow Abatement Plan). Similarly, Sanitation District No. 1 (SD1) in Northern Kentucky is advancing its “Clean H2O40” program, utilizing smart sewer technology to optimize storage and conveyance rather than solely relying on gray infrastructure expansion.

Funding availability has surged due to the Infrastructure Investment and Jobs Act (IIJA), administered through the Kentucky Infrastructure Authority (KIA). Significant focus is also being placed on resilience following the catastrophic 2022 flooding in Eastern Kentucky, prompting new designs for flood-proof lift stations and treatment plants. Furthermore, the massive BlueOval SK Battery Park in Glendale has triggered urgent requirements for new municipal infrastructure in Hardin County to support the influx of industrial wastewater and population growth.

Two structural shifts sit beneath these projects. Industrial recruitment has begun to drive treatment capacity decisions in places with no prior history of large capital work, which means several mid-size utilities are now planning expansions sized around a single employer’s process water and a projected population that has not yet arrived. And the wet weather strategy at the large utilities has moved decisively toward real-time control and in-system storage rather than new concrete, which shifts spending from tankage toward instrumentation, actuated gates, modeling, and the operational capability to run a collection system dynamically during a storm.

3. Top 20 Largest Treatment Plants in Kentucky

The following table ranks the largest wastewater treatment plants in Kentucky by design capacity (MGD). Data is compiled from KDOW facility reports, EPA ECHO databases, and municipal utility annual reports.

Profiles of the Top 5 Largest Facilities

1. Morris Forman Water Quality Treatment Center

The Louisville Metropolitan Sewer District Morris Forman Water Quality Treatment Center is the largest facility in the Commonwealth by a wide margin and the solids processing hub for the entire MSD system.

• Location: Louisville, Jefferson County
• Design Capacity: 120 MGD (Peak wet weather capacity > 300 MGD)
• Operating Authority: Louisville MSD
• Receiving Water: Ohio River
• Service Area: Metro Louisville and parts of Oldham County

Treatment Process: The flagship facility for MSD utilizes pure oxygen activated sludge secondary treatment. It features advanced preliminary treatment with coarse and fine screening to handle the heavy combined sewer load.

Infrastructure Highlights: Morris Forman is the regional hub for solids processing. It utilizes anaerobic digestion and a massive thermal hydrolysis process (THP) currently being integrated to produce Class A biosolids. The plant generates substantial renewable energy via methane capture and cogeneration.

Recent Upgrades: A major $200M+ Biosolids Processing Solution project is underway to replace aging dryers with new technology to produce marketable fertilizer pellets.

2. Dry Creek Wastewater Treatment Plant

The Sanitation District No. 1 Dry Creek Wastewater Treatment Plant is the largest facility in Northern Kentucky and treats a substantial share of the Kentucky side of the Cincinnati metropolitan area.

• Location: Villa Hills, Kenton County
• Design Capacity: 46.5 MGD
• Operating Authority: Sanitation District No. 1 (SD1)
• Receiving Water: Ohio River
• Service Area: Northern Kentucky (Boone, Kenton, and Campbell Counties)

Treatment Process: Conventional activated sludge with biological nutrient removal capabilities. The plant handles flows from a significant portion of the Cincinnati metropolitan area lying within Kentucky.

Infrastructure Highlights: Dry Creek serves as the central control node for SD1’s expansive network of pump stations and equalization tanks.

Compliance: Operating under an amended consent decree, the facility has seen significant investment in wet weather flow management to reduce CSOs into the Ohio River.

3. Town Branch Wastewater Treatment Plant

The Lexington-Fayette Urban County Government Town Branch Wastewater Treatment Plant serves downtown and northern Lexington and carries much of the city’s consent decree obligation.

• Location: Lexington, Fayette County
• Design Capacity: 30.0 MGD (Peak flow 64 MGD)
• Operating Authority: Lexington-Fayette Urban County Government (LFUCG)
• Receiving Water: Town Branch of Elkhorn Creek
• Service Area: Downtown and North Lexington

Treatment Process: Advanced secondary treatment utilizing oxidation ditches and vertical loop reactors. Tertiary treatment includes deep bed gravity filters and UV disinfection.

Recent Upgrades: As part of Lexington’s EPA Consent Decree, Town Branch has undergone massive rehabilitation, including a new Wet Weather Flow Storage facility capable of holding 22 million gallons.

4. Derek R. Guthrie Water Quality Treatment Center

• Location: Louisville, Jefferson County
• Design Capacity: 26.5 MGD
• Operating Authority: Louisville MSD
• Receiving Water: Ohio River

Treatment Process: Uses a vertical shaft oxidation ditch system. It is a key facility for managing suburban growth in southern Jefferson County.

Infrastructure: Known for its energy efficiency and automated SCADA integration. The plant utilizes UV disinfection to eliminate chlorine hazards.

5. West Hickman Creek Wastewater Treatment Plant

• Location: Lexington, Jessamine County line
• Design Capacity: 21.0 MGD
• Operating Authority: LFUCG
• Receiving Water: West Hickman Creek

Treatment Process: Utilizes vertical loop reactors for biological treatment. The plant is critical for the rapidly growing southern sector of Lexington.

Notable Features: Recipient of multiple NACWA Peak Performance Awards. Recent projects include filter improvements and chemical feed system upgrades for phosphorus removal.

Regional & Significant Facilities (Rank 6-20)

Regional Hubs (Rank 6-10)

• Max E. Walters (Owensboro): 16 MGD. Operated by RWRA. Features a comprehensive telemetry system monitoring over 50 pump stations.
• Bowling Green WWTP: 15 MGD. Operated by BGMU. Dealing with rapid industrial growth; sits in a high-risk karst zone requiring specialized conveyance engineering.
• Paducah WWTP: 14 MGD. Recently upgraded screw pumps and grit removal systems to handle Ohio River flood stages.

Major Municipal Plants (Rank 11-15)

• Elizabethtown WWTP: 9.5 MGD. Currently facing the most pressure in the state due to the Ford BlueOval SK battery plant construction nearby; major expansion planning is imminent.
• Western Regional (SD1): 8.5 MGD. Newer facility designed to support the explosive residential growth in Boone County.

4. Kentucky Treatment Plant Directory by Region

Kentucky’s treatment capacity concentrates in three metropolitan utilities that together carry the state’s combined sewer inventory and all three of its federal consent decrees. Outside that triangle the picture changes completely: mid-size municipal plants in the west and south-central regions, and in Eastern Kentucky a scattered set of small systems where affordability and operator availability constrain what is technically possible. The sections below index every Kentucky facility profiled on this site, grouped by region.

Louisville and the Ohio River

Louisville MSD operates the largest system in the Commonwealth and has been under a federal consent decree since 2005. The Integrated Overflow Abatement Plan behind it is instructive for how combined sewer programs have evolved: rather than eliminating overflows through separation, the strategy captures and conveys wet weather flow to treatment through deep storage, with the Waterway Protection Tunnel providing several dozen million gallons of storage that drains back to Morris Forman after a storm passes. That approach makes the treatment plant’s wet weather capacity, not the tunnel volume, the ultimate constraint, which is why Morris Forman’s peak capability runs well over twice its rated flow.

Morris Forman, historical identity. Our article on the Louisville and Jefferson County Metropolitan Sewer District Morris Forman Sewage Treatment Plant covers the facility under the name it carried before MSD reclassified its plants as water quality treatment centers. It documents the plant’s earlier configuration, its position on the Ohio River below downtown, and the solids handling arrangement that made it the district’s regional processing hub. Readers looking for the current operation should use the entry linked in the top-five profiles above; both describe the same site.

MSD’s Derek R. Guthrie, Hite Creek, and Floyds Fork facilities are not yet covered by individual articles on this site, despite Guthrie ranking fourth in the state by capacity.

Northern Kentucky and the Cincinnati Metro

Sanitation District No. 1 serves the Kentucky side of a metropolitan area whose center is in another state, which creates a planning situation with few parallels. Growth pressure comes from a regional economy SD1 does not control, the receiving water is shared with a much larger upstream discharger, and the district’s own consent decree runs alongside a separate and larger one across the river. SD1’s response has leaned harder on real-time control than most peer utilities: instrumented sewers, actuated regulator gates, and a control philosophy that treats the collection system as distributed storage to be actively managed rather than as passive pipe.

Dry Creek, district identity. A second article covers the Northern Kentucky Sanitation District No. 1 Dry Creek Sewage Treatment Plant under an earlier naming convention. It addresses the plant’s role as the hub of the district’s pump station and equalization network and the wet weather investment sequence driven by the consent decree. As with Morris Forman, this is the same facility as the entry in the top-five profiles above, documented under a different name.

SD1’s Western Regional facility in Union and Eastern Regional facility in Alexandria, both of which appear in the top-20 table, are not yet covered individually.

Lexington and the Bluegrass

Lexington’s two plants operate under a consent decree entered in 2011 addressing sanitary sewer overflows and collection system capacity rather than combined sewers. The distinction matters: where Louisville’s problem is stormwater entering pipes by design, Lexington’s is stormwater entering pipes that were never meant to receive it, which makes rehabilitation of the collection system as central to compliance as anything happening at the plants. Both facilities have added substantial wet weather storage as a result.

The Bluegrass also introduces a geological factor. Much of central Kentucky sits on soluble limestone, and in karst terrain surface drainage can enter the subsurface through sinkholes and travel considerable distances through conduits before re-emerging at a spring. For wastewater engineering this has two consequences: a discharge or an overflow can affect groundwater and a spring-fed stream some distance away with little attenuation, and conveyance construction carries a persistent risk of voids, bedding failure, and sinkhole development along the alignment. Geotechnical investigation is not a formality on a Bluegrass or Pennyrile conveyance project.

Lexington’s West Hickman Creek plant, the fifth largest in the state, and the Georgetown, Winchester, Frankfort, and Richmond facilities are not yet covered individually.

Western Kentucky and the Green River

Western Kentucky’s plants discharge to the Ohio, the Green, and the Tennessee, and they face two conditions the Golden Triangle does not. River stage governs hydraulics at the Ohio River cities, where flood conditions can submerge outfalls and force pumped discharge for extended periods. And the region’s agricultural and food processing economy contributes high-strength industrial load at a scale that changes a plant’s organic loading well beyond what its service population suggests.

Owensboro. Our article on the Owensboro Municipal Utilities wastewater treatment plant covers wastewater treatment serving Owensboro and Daviess County. Note that treatment in this service area is operated by the Regional Water Resource Agency rather than by Owensboro Municipal Utilities, which handles electric and water service; the article’s title reflects a common conflation of the two organizations and the attribution should be confirmed before the entry is cited. The Max E. Walters Regional facility that serves the area is notable for the telemetry network monitoring its extensive pump station system, a necessity in flat terrain where gravity conveyance is limited.

Bowling Green, Paducah, Hopkinsville, and Henderson are not yet covered by individual articles despite all appearing in the top-20 table.

Eastern Kentucky and Appalachia

Eastern Kentucky’s wastewater problem is structural rather than technical. Steep terrain and dispersed settlement patterns make conventional collection expensive per connection, the rate base to support it is small, and many systems inherited infrastructure built with grant funding decades ago that has now reached the end of its life with no replacement reserve behind it. Straight-pipe discharges and failing package plants remain a documented issue in parts of the region. The July 2022 flooding compounded all of it, destroying or damaging treatment and pumping infrastructure across several counties and shifting the immediate priority from upgrade to restoration and relocation.

For engineers, the region’s projects tend to be funding-assembly exercises as much as design exercises, drawing on Kentucky Infrastructure Authority programs, Appalachian Regional Commission support, and federal disaster funds in combination. Technology selection is constrained accordingly: processes requiring daily skilled attention are not viable where one certified operator covers several systems across mountain roads. None of the Eastern Kentucky facilities is yet covered by individual articles on this site.

5. Plants with Approved Budgets & Expansion Projects

Kentucky utilities are currently executing over $750 million in capital improvement projects driven largely by Consent Decree compliance and economic development.

A. Major Projects Under Construction (2024-2026)

B. Projects in Design/Planning Phase (2025-2027)

• Elizabethtown Regional Sewer Expansion:
  • Budget: Est. $45 Million
  • Scope: Capacity expansion and interceptor upgrades to serve the Glendale mega-site (BlueOval SK).
  • Status: Engineering design and right-of-way acquisition.
• Frankfort Sewer System Rehabilitation:
  • Budget: $18 Million (KIA Funding)
  • Scope: Rehabilitation of downtown collectors to reduce I/I (Inflow & Infiltration).

C. Recently Completed Major Projects (2022-2024)

• Waterway Protection Tunnel (Louisville): Completed in 2022. A $200M+ project creating a 4-mile long tunnel aimed at preventing combined sewer overflows into the Ohio River.
• Bowling Green Pump Station Expansions: Completed in 2023. Upgrades to key lift stations to navigate karst terrain challenges and support industrial parks.

6. Regulatory & Compliance Landscape

Kentucky facilities operate under the Kentucky Pollutant Discharge Elimination System (KPDES), managed by the Kentucky Division of Water (KDOW). The regulatory landscape is heavily influenced by the EPA’s focus on eliminating sanitary sewer overflows.

• Consent Decrees: Louisville MSD, LFUCG (Lexington), and SD1 (Northern KY) are all operating under long-term federal consent decrees requiring billions in spending to mitigate CSOs and SSOs.
• Nutrient Removal: With the Ohio River being a major contributor to Gulf hypoxia, KDOW is enforcing stricter limits on Total Nitrogen and Total Phosphorus for major dischargers.
• PFAS: Kentucky is currently conducting statewide sampling of influent, effluent, and biosolids for PFAS. While strict limits are not yet universal in permits, anticipation of federal MCLs is driving testing.
• ORSANCO standards: The Ohio River Valley Water Sanitation Commission publishes pollution control standards for the Ohio River mainstem that member states incorporate into permitting. For Kentucky, whose northern boundary is the river for its entire length, this adds an interstate layer to permits at Louisville, Northern Kentucky, Paducah, Henderson, and Ashland that inland facilities do not carry.
• Groundwater protection in karst: Where surface drainage enters the subsurface through sinkholes, KDOW applies groundwater protection requirements alongside surface water permitting. Land application, lagoon siting, and subsurface disposal all face additional scrutiny in karst counties, and a dye trace study is often necessary to establish where a discharge actually goes.

Why three consent decrees at once matters

Louisville MSD, LFUCG, and SD1 together serve well over half the state’s sewered population, and all three are executing court-supervised programs with fixed milestones. That concentration has three practical effects. It makes the Kentucky market unusually predictable, since decree schedules are public and milestone-driven rather than discretionary. It makes it unusually competitive, because the same three owners are procuring similar work in the same window. And it makes rate pressure a live political issue in all three service areas simultaneously, which constrains what any of them can add to their programs beyond what the decree requires. A project that is not decree-driven at one of these utilities faces a harder internal case than its technical merits alone would suggest.

Distillery load and high-strength waste

Kentucky’s bourbon industry concentrates in the Bluegrass and central counties, and distillation produces stillage with organic strength one to two orders of magnitude above domestic wastewater. Most large distilleries manage this on site, recovering the solid fraction as animal feed and treating or land-applying the liquid, precisely because municipal plants generally cannot absorb it. But the industry’s expansion has put pressure on the smaller municipal systems serving distillery towns, where even a modest permitted contribution represents a large share of the plant’s organic loading. Any capacity analysis in these counties should be run on organic load rather than on hydraulic flow, and pretreatment agreements deserve close attention.

7. Infrastructure Challenges & Opportunities

Karst Topography: A unique challenge for Kentucky engineers, particularly in the Bowling Green and South Central areas, is the limestone karst geology. Pipe bedding failures and sinkholes are constant risks, requiring specialized geotechnical engineering for all conveyance projects.

Workforce Development: Like many states, Kentucky faces a “Silver Tsunami” of retiring operators. Opportunities exist for firms offering automation, remote SCADA monitoring, and operational consulting to bridge the skills gap.

Small system affordability: Several hundred small municipal and district systems operate with rate bases too thin to fund asset replacement. Regionalization, shared operations contracts, and consolidation under larger districts are being pursued as alternatives to capital that cannot be raised locally, and this is where much of the state’s federal grant funding is directed.

Flood resilience: The 2022 Eastern Kentucky floods and recurring Ohio River flooding have made elevation, flood-proofing, and relocation standing considerations in plant and pump station design across large parts of the state, rather than exceptional measures at a few exposed sites.

8. Technology Trends in Kentucky

• Thermal Hydrolysis: Louisville MSD’s adoption of THP is setting a trend for large-scale biosolids management in the region.
• Peracetic Acid (PAA): Several plants are piloting or switching to PAA for disinfection to reduce the safety risks associated with chlorine gas and the cost of dechlorination.
• Real-Time Control (RTC): SD1 and MSD are leaders in using smart sensors and actuated gates to maximize in-system storage during storm events, reducing the need for building massive concrete storage tanks.
• Deep rock tunneling: The dominant wet weather strategy at both Louisville and SD1, driven by dense development and terrain that makes surface storage impractical. Shaft siting and geotechnical conditions in limestone are the critical path items.
• Oxidation ditches and vertical loop reactors: Widely used at Kentucky’s mid-size plants for their operational stability and tolerance of variable loading, both valuable where operator staffing is thin.
• Package plant replacement and regionalization: In rural counties, connecting small failing systems to a regional facility is increasingly preferred over replacing the package plant, shifting spend toward force mains and pump stations.

9. Comparing Kentucky Facility Classes

Kentucky facilities sort by sewer system type, by whether a consent decree governs the capital program, and by the operating capacity behind them. The table below summarizes how those classes differ.

10. Benchmarking and Site Selection

A state directory gets used to size a market, to find a comparable facility for a design or bid basis, and to anticipate permit requirements. In Kentucky all three start with whether a consent decree is in play.

Selecting a comparable facility

Match on sewer type and decree status before matching on capacity. A combined sewer plant under a decree has a capital profile dominated by wet weather capture and a schedule set by a court, while a separate-sewer plant of the same size is spending on capacity and asset renewal on its own timeline. Then check the organic loading against the service population, because a plant receiving significant food processing or distillery contribution operates well outside the range its flow would predict. For rural comparables, add operator staffing as a filter, since it constrains which processes were realistically available to the utility in the first place.

Worked example: sizing a comparison set

Suppose a mid-size city needs a benchmark for a 12 MGD plant expansion driven by an industrial recruitment, on a separate sewer system with no decree obligation. Filtering by decree status eliminates all three large utilities immediately, which removes most of the state’s published capital cost data. What remains is the Bowling Green, Paducah, Hopkinsville, and Elizabethtown group. Two adjustments matter before normalizing to a per-MGD figure. Separate any conveyance and interceptor scope from the plant scope, since industrial recruitment projects in Kentucky routinely bundle several miles of trunk sewer into the same program, as the Elizabethtown work does. And confirm whether the comparable sits in karst, because geotechnical investigation, foundation treatment, and conveyance alignment costs in limestone terrain are not transferable to a site outside it.

Comparing Kentucky to other state markets

Kentucky’s combination of Ohio River geography and consent decree concentration is shared with its neighbors, which makes cross-state comparison unusually direct here. The Ohio wastewater treatment plants directory covers the closest analog, with a comparable inventory of combined systems under federal decrees, the same ORSANCO standards on the mainstem, and a larger sample of tunnel and storage projects to benchmark against. The Indiana wastewater treatment plants directory covers the state directly across the river from Louisville, where a similar decree-driven program has produced its own generation of deep tunnel work. The Tennessee wastewater treatment plants directory covers the adjacent state to the south, sharing both the karst belt that runs through south-central Kentucky and a comparable rural system profile.

11. Field Notes

Consent decree schedules are the market calendar

Three utilities carry most of Kentucky’s capital spending, and their milestones are matters of public record with fixed dates. That makes the pipeline visible years in advance in a way it is not in states where capital planning is discretionary. It also means the window is narrow: decree work is procured when the schedule requires it, and a supplier or firm that misses a milestone cycle waits for the next one. Reading the decrees and their amendments is more useful than reading capital improvement plans in this state.

In karst, know where the water actually goes

A discharge, an overflow, or a land application site in limestone terrain may connect to a spring or a water supply some distance away through conduits that do not follow surface topography. Dye tracing is the standard method for establishing the connection, and its results can change a permit condition, a siting decision, or a monitoring requirement substantially. Treating a karst site as if surface drainage patterns describe the subsurface is the most consequential mistake available on a Kentucky conveyance or disposal project.

12. Permitting & Design Standards Reference

KDOW administers discharge permitting, with an interstate commission layer on the Ohio River mainstem and separate groundwater provisions that matter in karst counties.

Discharge permitting in Kentucky is administered by the Energy and Environment Cabinet, Division of Water, under the Kentucky Pollutant Discharge Elimination System, with regulations codified in Title 401 of the Kentucky Administrative Regulations. Facilities discharging to the Ohio River mainstem are additionally subject to the pollution control standards published by the Ohio River Valley Water Sanitation Commission, and construction of treatment works requires plan approval from the Division of Water. Funding through the Clean Water State Revolving Fund is administered by the Kentucky Infrastructure Authority.

Specification checklist for a Kentucky project

1. Establish whether the utility operates under a federal consent decree, and obtain the milestone schedule if so.
2. Confirm whether the collection system is combined, separate, or partially separated, and quantify inflow and infiltration.
3. Establish design average flow and wet weather peak separately, including any tunnel or storage dewatering condition.
4. Determine whether the discharge is to the Ohio River mainstem and therefore subject to ORSANCO standards.
5. Obtain nitrogen and phosphorus limits and confirm whether Gulf hypoxia-driven reductions are anticipated at renewal.
6. Establish whether the site sits in karst terrain, and commission geotechnical investigation and dye tracing accordingly.
7. Characterize industrial contribution, including distillery, food processing, and manufacturing load, on an organic basis rather than hydraulic.
8. Confirm pretreatment program requirements and the headroom available for new industrial contributors.
9. Establish flood exposure, including river stage for Ohio River cities and flash flood risk in eastern counties, and confirm elevation and flood-proofing scope.
10. Determine biosolids end use and whether land application acreage is secured within a reasonable haul distance.
11. Verify operator certification class requirements and realistic staffing availability before selecting process complexity.
12. For rural projects, evaluate regionalization or connection to a larger system as an alternative to standalone treatment.
13. Confirm Kentucky Infrastructure Authority funding participation and any conditions attached, including Appalachian Regional Commission or disaster funding where applicable.
14. Identify applicable AWWA, WEF, and ANSI/ASME standards for the specific equipment package.

13. Directory of Facilities

Browse our resources for specific plant data. The regional listings in Section 4 above provide the current facility coverage, organized by region and linked to individual profiles.

• Louisville Region Facilities (MSD): Morris Forman and the MSD system, covered above; Derek R. Guthrie, Hite Creek, and Floyds Fork not yet profiled.
• Lexington & Bluegrass Region Plants: Town Branch, covered above; West Hickman Creek, Georgetown, Winchester, Frankfort, and Richmond not yet profiled.
• Northern Kentucky / SD1 Facilities: Dry Creek, covered above; Western Regional and Eastern Regional not yet profiled.
• Western Kentucky & Paducah Area: Owensboro area treatment, covered above; Paducah, Bowling Green, Hopkinsville, and Henderson not yet profiled.
• Eastern Kentucky: No individual facility profiles yet; see the regional discussion above.

14. Resources for Engineers & Operators

• Kentucky Division of Water (KDOW): Website – Permitting and compliance data.
• Kentucky Water & Wastewater Operators Association (KWWOA): Website – Training and certification.
• Kentucky Infrastructure Authority (KIA): Website – SRF loan information and funding cycles.
• KY/TN Water Environment Association: Website – Regional WEF member association.
• ORSANCO: Ohio River mainstem pollution control standards and monitoring data.
• Kentucky Geological Survey: Karst mapping, sinkhole inventories, and groundwater flow data essential to conveyance and siting work.
• Kentucky Rural Water Association: Technical assistance and circuit rider support for small systems.
• Kentucky Public Service Commission: Rate regulation for investor-owned and certain district systems.

15. FAQ Section

How many wastewater treatment plants are in Kentucky?

Kentucky has over 250 municipal wastewater treatment plants, ranging from the massive 120 MGD Morris Forman facility to small package plants serving rural communities.

What is the largest wastewater treatment plant in Kentucky?

The Morris Forman Water Quality Treatment Center in Louisville is the largest, with a design capacity of 120 MGD and wet weather handling capabilities exceeding 300 MGD.

Which Kentucky utilities are under Consent Decrees?

The three largest utility operators—Louisville MSD, Lexington-Fayette UCG, and Sanitation District No. 1 (Northern KY)—are all currently executing projects under federal Consent Decrees to reduce sewer overflows.

What funding is available for wastewater projects in Kentucky?

Funding is primarily available through the Kentucky Infrastructure Authority (KIA), which administers the Clean Water State Revolving Fund (CWSRF). Additional funding has been made available through the federal IIJA and Cleaner Water Program grants.

How is Kentucky addressing PFAS in wastewater?

The Kentucky Division of Water (KDOW) and the Department for Environmental Protection have initiated statewide sampling studies to determine the prevalence of PFAS in wastewater effluent and biosolids, though specific discharge limits are pending federal EPA finalization.

Why does karst geology matter for wastewater engineering?

In karst terrain, soluble limestone develops sinkholes, conduits, and caves through which surface water enters the subsurface and travels considerable distances before re-emerging at a spring. Two consequences follow. A discharge or overflow can affect groundwater and a spring-fed stream well away from the point of release, with little of the attenuation a surface stream would provide, which is why dye tracing is standard practice for establishing connections. And construction carries persistent risk of voids, bedding failure, and sinkhole development along a pipeline alignment, requiring geotechnical investigation and often foundation treatment that a project outside karst would not need.

What is ORSANCO and how does it affect Kentucky permits?

The Ohio River Valley Water Sanitation Commission is an interstate body formed by the states bordering the Ohio River. It publishes pollution control standards for the mainstem that member states incorporate into their permitting programs, covering parameters and monitoring expectations that apply consistently along the river regardless of which state issues the permit. Because Kentucky’s entire northern boundary is the Ohio River, facilities at Louisville, Northern Kentucky, Paducah, Henderson, and Ashland operate under this additional layer, while inland plants discharging to the Green, Kentucky, or Licking rivers do not.

Why are three Kentucky utilities under consent decrees at the same time?

Louisville, Lexington, and Northern Kentucky all developed sewer systems in an era when combining sanitary and storm flow was standard practice, or built separate systems that later took on substantial stormwater through infiltration. EPA enforcement in the 2000s and early 2010s targeted such systems nationally, and Kentucky’s three largest utilities were addressed in sequence. The result is that a majority of the state’s sewered population is served by utilities executing court-supervised programs with fixed milestones, which makes the Kentucky capital market unusually predictable and unusually concentrated in the same window.

What is the wastewater situation in rural Eastern Kentucky?

It is primarily a financial and institutional problem rather than a technical one. Steep terrain and dispersed settlement make conventional collection expensive per connection, rate bases are small, and much of the infrastructure was grant-funded decades ago with no replacement reserve behind it. Straight-pipe discharges and failing package plants remain documented in parts of the region. The 2022 flooding damaged or destroyed treatment and pumping assets across several counties, shifting priorities toward restoration and relocation. Solutions increasingly involve regionalization and shared operations rather than replacing each small plant in place.

16. Conclusion

Kentucky’s wastewater sector runs on two tracks that barely intersect. On one, three metropolitan utilities are executing the largest capital programs in the Commonwealth’s history against milestones set by federal courts, with deep tunnels, real-time control, and thermal hydrolysis marking the technical frontier. On the other, several hundred small systems face a question that no technology answers: whether a rate base of a few thousand connections can fund the replacement of infrastructure built with grant money two generations ago. Industrial recruitment is now adding a third pattern, where mid-size utilities plan expansions around a single employer and a population that has not yet arrived.

Use this directory as an index organized around those tracks. Start from the sewer system type and whether a decree governs the schedule, check the geology before assuming anything about where a discharge goes, and only then compare capacity and cost. The regional listings above link to detailed profiles of every Kentucky facility covered on this site, and the cross-state comparisons in Section 10 help separate an Ohio River basin condition from a Kentucky one.