Albuquerque, the largest city in New Mexico, is home to a vibrant community and a robust infrastructure that supports its populace. Among the critical infrastructures essential for maintaining the health and welfare of Albuquerque’s residents, the Albuquerque Collection System stands out. This wastewater management system is a complex network designed to efficiently collect and treat wastewater for the entire city. As a case study in municipal Collection & Conveyance infrastructure, Albuquerque’s collection system illustrates the engineering, operational, and community engagement challenges facing mid-sized arid-region cities — where limited water resources, rapid growth, aging infrastructure, and climate-driven variability in both water supply and stormwater create a uniquely demanding operating environment for collection system professionals.
The Albuquerque Collection System serves a population of approximately 560,000 residents across both residential and commercial properties, ensuring that wastewater generated from homes, businesses, and public facilities is effectively managed and treated. The system encompasses over 3,000 miles of sewer mains ranging from 6-inch laterals to large-diameter trunk sewers, more than 80 lift stations that convey sewage across the city’s varied topography, and two primary water reclamation plants — the Southside Water Reclamation Plant and the Westside Water Reclamation Plant.
Each day, the Albuquerque Collection System manages approximately 57 million gallons of wastewater. This volume underscores the city’s responsibility to maintain a system that can handle both the daily loads and potential surges due to weather events or population growth. The treatment plants associated with the system are equipped to process up to 76 million gallons of wastewater per day — providing a meaningful buffer above current average daily flow to accommodate peak wet-weather conditions and future growth.
Albuquerque’s collection system presents characteristics typical of arid-climate western cities that differ substantially from eastern and Gulf Coast utilities. The Rio Grande basin setting creates a dual water challenge — limited precipitation means that the collection system routinely conveys flow volumes well below design capacity under dry weather conditions, but the episodic high-intensity monsoon events characteristic of the region can produce rapid inflow and infiltration (I&I) surges that briefly exceed system capacity. The city’s significant elevation variation — ranging from approximately 4,900 to 6,700 feet across the urbanized area — requires a lift station network that must pump sewage against substantial head in some corridors while gravity mains serve flatter central areas.
The prevalence of older clay and concrete sewer mains in established neighborhoods — many dating to the 1950s and 1960s — creates chronic I&I vulnerability through cracked pipe joints, deteriorated connections, and root intrusion that admits groundwater and stormwater into the sanitary system. Managing this I&I load while the city continues to grow presents the central capital planning challenge for the Albuquerque Bernalillo County Water Utility Authority (ABCWUA).
The Albuquerque Collection System illustrates the operational and infrastructure planning challenges common to municipal collection systems across the western United States — but the collection and conveyance discipline extends beyond gravity sewer networks to encompass the specialized solids conveyance equipment used within treatment plants to move biosolids, screenings, and grit between process units. The subtopics below address the primary collection systems topics and solids conveyance equipment comparisons covered in depth on this site.
Wastewater collection systems — the network of gravity sewers, force mains, lift stations, and associated structures that convey raw wastewater from homes and businesses to treatment plants — represent the largest single component of wastewater utility asset value and the most operationally complex infrastructure category that collection system professionals manage. Municipal gravity sewer networks are typically designed at slopes sufficient to maintain self-cleaning velocity of 0.6 m/s (2 ft/s) at full-pipe flow conditions, preventing solids deposition that would otherwise cause odor, corrosion, and blockages — but in practice, many legacy systems contain flat-gradient reaches that operate below self-cleaning velocity under average flow conditions, creating accumulation zones that require periodic flushing. Lift stations — pumped systems that raise sewage to a higher elevation for continued gravity conveyance — are the highest-maintenance elements of collection systems, requiring submersible or dry-pit pumps, redundant pump sets for N-1 reliability, wet well storage for flow equalization, emergency generator connections for power outage continuity, and telemetry for remote monitoring and alarm response. Collection system sustainability strategies increasingly incorporate asset management frameworks — using CCTV inspection data, pipe age, material, and soil condition to prioritize rehabilitation investments — rather than calendar-based replacement that ignores actual pipe condition. In arid-climate systems like Albuquerque’s, wastewater recycling from water reclamation plants back to recharge basins or direct agricultural use represents an integrated collection-treatment-reuse cycle that closes the urban water loop in water-scarce environments.
The schwing vs jim myers for solids conveyance comparison addresses one of the most consequential equipment selection decisions in biosolids handling system design — the choice between piston pump-based solids conveyance (Schwing) and progressive cavity pump-based conveyance (Jim Myers) for transferring thickened or dewatered sludge between process units within a water reclamation plant. Schwing hydraulic piston pumps convey high-solids sludge (20–35% TS) at high pressures (up to 120 bar) over long distances using a reciprocating piston that pushes sludge in batch strokes through a pipeline — the high-pressure capability and tolerance for high-solids material make Schwing-type pumps the standard for long-distance biosolids transfer from dewatering buildings to cake storage or loading areas. Jim Myers progressive cavity pumps convey sludge at lower pressures (typically below 30 bar) using a helical rotor turning within a stator to produce smooth, continuous, non-pulsating flow — the gentler conveyance mechanism preserves floc structure in polymer-conditioned sludge better than the piston pump’s pressure surges, making progressive cavity pumps preferred for applications where sludge enters another process step (like a dryer or thermal oxidizer) where floc integrity affects performance. The selection between these two technologies depends on conveyance distance and pressure requirement, sludge solids content and rheology, whether continuous or batch conveyance is more compatible with the downstream process, and lifecycle maintenance cost — piston pumps require more frequent valve and seal maintenance but at predictable intervals, while progressive cavity pump stators have variable life dependent on sludge abrasivity.
The jim myers vs serpentix for solids conveyance comparison extends the solids conveyance equipment selection framework to belt conveyor-based systems — specifically the Serpentix flexible screw conveyor — as an alternative to progressive cavity pumps for applications where the sludge must be conveyed at lower pressure over shorter distances, or where the sludge’s high solids content and sticky texture create pipeline plugging risks that make pump-based conveyance problematic. Serpentix flexible screw conveyors use a rotating flexible helical screw inside a tube to transport dewatered sludge cake at 20–35% TS along curved or inclined paths without the pressure requirements of pump-based systems — the ability to route conveyors around obstructions and up inclines of 30–40° without the pressure rating constraints of pump pipelines provides layout flexibility in retrofitting conveyance routes through existing buildings. Jim Myers progressive cavity pumps maintain an advantage over Serpentix in applications requiring long-distance transport (above 30–50 meters), where conveyor lengths become impractical, or where the conveyance path must pass through walls or floors where a pipe penetration is more practical than a conveyor opening. The capital cost comparison depends strongly on distance and configuration — at short distances (below 20 meters), Serpentix flexible screw conveyors are typically lower capital cost than pump systems; at longer distances, the pump-plus-pipeline configuration becomes more economical.
The landscape of top oems for solids conveyance systems for water and wastewater applications spans piston pump manufacturers, progressive cavity pump suppliers, belt and screw conveyor OEMs, and specialty equipment providers for screenings, grit, and biosolids handling — each category dominated by a small number of established manufacturers with significant differences in product capability, service network, and application experience. In the piston pump category for high-pressure biosolids transfer, Schwing Bioset and Putzmeister are the primary global suppliers with established track records at large municipal facilities. In progressive cavity pumps for sludge conveyance, Moyno (Robbins & Myers), NOV (National Oilwell Varco), and Seepex are the dominant suppliers. For screw and belt conveyor systems, Serpentix, Andritz, and FLSmidth provide competing products. Evaluating OEMs for solids conveyance procurement requires assessing not just initial equipment performance but parts availability, local service engineer presence, reference installation performance data at equivalent duty conditions, and the manufacturer’s financial stability for warranty and long-term support — because a solids conveyance system failure that halts biosolids transfer from a dewatering building can shut down the entire dewatering operation within hours.
In recent years, Albuquerque has committed significant resources to upgrade its wastewater infrastructure. The city embarked on a $200 million improvement project aimed at modernizing the aging pipes and treatment plants. This initiative is expected to improve the efficiency of wastewater management and reduce the risk of system failures — focusing particularly on the replacement of deteriorated clay pipe sewer mains in older neighborhoods where I&I from failing joints is most severe.
The Environmental Protection Agency (EPA) recognized the Albuquerque Collection System for its efforts in reducing pollutants in treated wastewater, showcasing the city’s commitment to environmental stewardship. Albuquerque’s NPDES permit for the Southside Water Reclamation Plant includes stringent limits for nutrient discharge to the Rio Grande — a critical receiving water for downstream users including agricultural irrigators — making advanced nutrient removal a regulatory priority driving ongoing plant upgrades.
Albuquerque has been integrating advanced technologies into its wastewater management practices. The city has implemented a real-time monitoring system that uses sensors and data analytics to optimize the maintenance and operation of the collection system. This initiative has significantly reduced the occurrence of leaks and blockages through early detection of pump failures, high wet well levels, and I&I events — enabling targeted response before failures escalate to overflows or permit violations.
One of the most significant projects associated with the Albuquerque Collection System is the San Juan-Chama Drinking Water Project. This project diverts water from the San Juan River basin for municipal use in Albuquerque, helping to replenish the Rio Grande and maintain a sustainable water supply. By using surface water to reduce groundwater pumping, Albuquerque has been able to stabilize its groundwater levels — an essential aspect given the city’s arid environment and the historic overdraft of the Rio Grande aquifer system.
The Southside Water Reclamation Plant, one of Albuquerque’s primary wastewater treatment facilities, is undergoing extensive upgrades focusing on improving the plant’s energy efficiency and increasing its capacity. The enhancements include installing new aeration systems, advanced filtration units, and energy-efficient pumps — all designed to streamline operations, reduce energy consumption, and meet increasingly stringent nutrient discharge limits to the Rio Grande.
The Stormwater Management Initiative addresses the impact of stormwater on the wastewater collection system. By constructing new stormwater retention basins and improving drainage systems, Albuquerque aims to reduce the likelihood of sewer overflows during heavy monsoon rainfalls — the episodic high-intensity precipitation events characteristic of the region’s climate. This project also includes public education campaigns on preventing stormwater pollution. For broader context on collection and conveyance of stormwater, the Stormwater resource covers urban stormwater collection system design, CSO mitigation, and green infrastructure integration strategies that complement the approaches Albuquerque is deploying.
The I&I Reduction Program is a continuous effort to identify and repair points where extraneous water enters the wastewater system. By addressing these issues, Albuquerque aims to prevent system overloads and reduce treatment costs. The program includes regular CCTV inspections of sewer lines, advanced acoustic and flow-based leak detection methods, private property lateral inspection and rehabilitation, and prompt repairs of identified issues — targeting the highest-I&I reaches first based on flow metering data that quantifies extraneous flow contribution at the sub-basin level.
| Component | Function | Design Parameters | Key O&M Considerations | Common Failure Modes | Typical Service Life |
|---|---|---|---|---|---|
| Gravity Sewer Mains (PVC/HDPE) | Convey wastewater by gravity to trunk sewers or lift stations | Minimum 0.6 m/s self-cleaning velocity; slope ≥ 0.4% for 8-inch | Periodic flushing; CCTV inspection every 5–10 years; root control | Root intrusion; joint separation; sagging; grease blockages | 50–100+ years (PVC/HDPE); 30–50 years (clay) |
| Gravity Sewer Mains (Vitrified Clay/Concrete) | Convey wastewater; common in pre-1980 infrastructure | Same velocity/slope requirements; joint infiltration common as mains age | Root foaming; joint sealing; I&I monitoring; rehabilitation prioritization | Root intrusion at joints; cracking; corrosion in H₂S environments | 30–60 years (concrete); 50–75 years (clay) |
| Force Mains | Convey sewage under pressure from lift station discharge to gravity system | Minimum 0.9 m/s scour velocity; surge analysis; air release valve placement | Air/vacuum valve inspection; cathodic protection; pigging for grease/debris | Corrosion at high-H₂S conditions; surge damage; air binding; joint failure | 20–50 years depending on material and H₂S exposure |
| Lift Stations | Pump sewage from low points to higher elevation for continued gravity conveyance | N-1 redundancy; 30-min wet well storage; emergency generator connection | Pump inspection; valve testing; wet well cleaning; telemetry calibration | Pump clogging (rags); seal failure; control panel faults; wet well corrosion | Pumps 10–20 years; wet well structure 30–50 years |
| Manholes and Access Structures | Provide inspection, maintenance, and flow measurement access | Maximum 300–400 ft spacing; frame/cover flush with grade; chimney seal | Frame/cover replacement; chimney inspection; inflow prevention sealing | Chimney cracking (I&I entry); frame rocking (inflow); corrosion in H₂S zones | 50+ years (precast concrete); indefinite with rehabilitation |
| Solids Conveyance (Piston Pumps) | Transfer dewatered sludge cake at high pressure over long distances | Up to 120 bar operating pressure; 20–35% TS sludge; pulsating flow | Valve and seal replacement; cylinder wear inspection; pressure relief testing | Valve failure; seal wear; pipeline plugging at bends; piston wear | Cylinders 10–15 years; valves 2–5 years |
Community engagement is a cornerstone of the Albuquerque Collection System. The city’s Water Utility Authority conducts regular public outreach programs to educate residents about the importance of wastewater management and how they can contribute to its efficiency. These programs include workshops, school visits, and informational campaigns that provide insights into proper waste disposal — including fats, oils, and grease (FOG) disposal that causes grease blockages in collection sewers — and water conservation practices.
Albuquerque has established Customer Advisory Committees to involve residents in decision-making processes related to the wastewater system. These committees provide a platform for community members to voice their concerns, offer suggestions, and stay informed about ongoing and future projects. Regular meetings and open forums ensure that the public remains an integral part of the conversation about wastewater management and rate-setting decisions.
Albuquerque regularly publishes detailed reports on the performance of its wastewater collection and treatment systems, including data on wastewater volumes, treatment efficacy, environmental compliance, sanitary sewer overflow (SSO) incidents, and financial expenditures. By making this information readily available, the city fosters trust and accountability with its residents and satisfies the public notification requirements associated with its NPDES permit.
Albuquerque collaborates with local universities and schools to promote research and education around wastewater management. Partnerships with the University of New Mexico have supported cutting-edge technologies for water treatment and studies to improve system efficiency — including research on arid-climate reuse applications and climate adaptation strategies for collection systems in water-stressed regions.
One of the significant challenges facing the Albuquerque Collection System is the impact of climate change. With predictions of increased frequency in extreme monsoon rainfall events combined with longer dry periods between events, the system must be resilient enough to handle sudden I&I surges while also managing the elevated H₂S and odor conditions that develop in collection systems during low-flow dry weather periods. Albuquerque is investing in climate resilience projects including enhanced stormwater separation, real-time control of lift station operations, and sustainable wastewater reuse options that reduce dependence on withdrawals from the increasingly stressed Rio Grande system.
Albuquerque’s population is expected to grow steadily over the coming decades. Preparing for this growth involves expanding the capacity of both the collection system and the water reclamation plants, while ensuring that the I&I burden from aging infrastructure does not consume the hydraulic capacity needed for legitimate growth flows. For broader guidance on sewer system planning and rehabilitation strategies used to address aging collection system infrastructure across municipalities of all sizes, the Sewer Systems resource covers the capital planning, rehabilitation technology, and funding frameworks that define best practice in collection system asset management.
Maintaining and upgrading the Albuquerque Collection System requires substantial financial resources. The city must balance the need for ongoing investments with the requirement to keep utility rates affordable for residents. Exploring alternative funding sources — including EPA Water Infrastructure Finance and Innovation Act (WIFIA) loans, State Revolving Fund financing, and EPA grants for I&I reduction — will be essential to ensuring the financial sustainability of the system.
Continued investment in smart technologies — real-time monitoring, predictive maintenance, digital twin modeling — will enhance the system’s efficiency and reliability. Advanced treatment methods including membrane bioreactors and renewable energy integration at the water reclamation plants will contribute to sustainable wastewater management that minimizes operating costs while meeting increasingly stringent discharge limits.
Effective I&I reduction programs begin with quantifying the extraneous flow contribution at the sub-basin level using a combination of rain-event flow metering, dry-weather baseline establishment, and night flow analysis — the standard tools for distinguishing I&I from legitimate dry-weather flow contributions. Night flow analysis — comparing minimum overnight flow rates (typically 2–4 AM) to expected minimum domestic flow — is a practical first-pass I&I screening method that identifies high-I&I sub-basins for priority CCTV investigation, directing rehabilitation resources toward the highest-impact reaches before conducting costly full-system inspections. Sub-basin I&I rates above 500 gallons per inch-diameter per mile per day (GPD/in-D/mi) under dry weather conditions typically indicate significant structural defects requiring active rehabilitation; rates above 1,000 GPD/in-D/mi indicate emergency-priority conditions that exceed the USEPA guideline threshold for excessive infiltration.
The most frequent collection system capital planning error is deferring I&I rehabilitation while simultaneously designing capacity expansions for the treatment plant or lift stations — spending capital to add hydraulic capacity that will be consumed by extraneous I&I flow rather than by genuine growth in wastewater generation from new customers. Addressing I&I first — to the extent that rehabilitation cost per gallon of I&I removed is lower than the expansion cost per gallon of added capacity — consistently produces better lifecycle cost outcomes than the alternative sequence. A second common operational mistake is underestimating the maintenance burden of grease blockages in flat-gradient sewer mains in commercial corridors — facilities that do not implement mandatory grease trap inspection and pumping programs for food service establishments upstream of known flat reaches routinely experience repeat blockages at the same locations that are treated reactively rather than addressed through source control enforcement.