Collection System Operators And The Prevention Of Sanitary Sewer Overflows
Collection system operators protect the first and often most overlooked stage of wastewater treatment. Before sewage reaches a pump station or treatment plant, it must move safely through a network of gravity sewers, force mains, manholes, wet wells, and laterals. A blockage, structural failure, excessive inflow, or equipment malfunction can interrupt that movement and cause a sanitary sewer overflow (SSO).
Preventing these incidents requires much more than reacting to alarms. Operators inspect assets, monitor flow conditions, remove obstructions, maintain mechanical equipment, document field observations, and coordinate with supervisors and emergency crews. Their daily decisions preserve public health, protect waterways, and help agencies meet regulatory obligations.
For water and wastewater professionals in the Los Angeles Basin, continuing education supports this work. The LABS of CWEA community brings together operators, engineers, consultants, and agency staff who share practical knowledge about collection systems, automation, maintenance, and changing compliance expectations.
Why Collection Systems Matter
A sanitary sewer network is a dynamic infrastructure system. Dry-weather flows may be predictable, but rainfall, groundwater infiltration, commercial discharges, grease, root intrusion, and population growth can quickly change hydraulic conditions. Operators must understand how these variables affect capacity throughout the system, especially at known bottlenecks and low-lying locations.
SSOs can release untreated wastewater into streets, homes, storm drains, creeks, and coastal waters. The consequences may include environmental damage, exposure risks, property impacts, costly cleanup, and enforcement action. Even a small overflow can reveal a larger problem, such as deteriorating pipe walls, inadequate pump capacity, or a recurring obstruction that has not been addressed at its source.
Collection system personnel are therefore essential risk managers. Their routine inspections and maintenance activities create an early-warning system for the utility. A well-maintained network is less likely to experience sudden failures, and operators who know the system can respond faster when conditions begin to deteriorate.
Daily Duties That Protect Capacity
Preventive maintenance is the foundation of overflow prevention. Operators perform or coordinate sewer cleaning, condition assessments, grease control activities, root treatment, manhole inspections, and pump station maintenance. The correct frequency depends on asset history, pipe material, diameter, slope, flow characteristics, and previous incidents.
Cleaning programs should be guided by evidence rather than a fixed calendar alone. A line with repeated grease accumulations may need more frequent service, while a stable segment may be managed through periodic verification. Closed-circuit television inspections can reveal cracks, offset joints, intruding roots, sediment deposits, and defects that are not visible from the surface.
Pump stations require equally close attention. Operators check wet-well levels, pump starts and stops, electrical panels, floats, valves, backup power, ventilation, and alarm systems. Preventing an SSO at a pump station often depends on recognizing a small change—a pump that cycles too often, a rising amperage reading, or an alarm that resets unexpectedly—before it becomes an emergency.
Using Data To Anticipate Failure
Modern collection system operations increasingly combine field expertise with data. Supervisory control and data acquisition systems, remote level sensors, flow meters, historical work orders, rainfall information, and customer reports can reveal patterns that are difficult to detect through isolated inspections. Operators add value by interpreting those signals in the context of actual site conditions.
A rising wet-well level may indicate a blocked discharge line, a failed pump, increased inflow, or an inaccurate sensor. Data provides an alert, but professional judgment determines the next action. Comparing current readings with normal operating ranges and recent maintenance history helps crews prioritize inspections and avoid unnecessary dispatches.
Asset management also benefits from accurate records. Each cleaning, blockage, overflow, repair, and inspection should be documented with location, cause, equipment condition, response time, and follow-up needs. Over time, this information supports targeted capital improvements, revised maintenance frequencies, and stronger emergency planning.
Operators can also learn from innovations beyond collection networks. For example, the energy recovery guide demonstrates how water professionals evaluate system performance, resource use, and operational efficiency across the treatment process. That same systems perspective helps collection staff connect upstream conditions with downstream impacts.
Responding Before A Problem Becomes An Overflow
When an alarm, customer complaint, odor report, or field inspection indicates a potential blockage, response speed matters. Operators first assess the hazard, confirm the location, protect the public, and determine whether wastewater is backing up, bypassing, or threatening a receiving water. Clear procedures reduce confusion and help crews work safely.
A response may involve jetting, rodding, vacuum removal, bypass pumping, portable generators, traffic control, or coordination with an electrical or mechanical team. Operators must select equipment appropriate to the pipe and blockage while avoiding actions that could damage fragile infrastructure. Personal protective equipment, confined-space procedures, gas monitoring, and communication protocols remain essential throughout the work.
After the immediate threat is controlled, the cause must be investigated. Repeated blockages should not be treated as isolated events. A root intrusion, grease source, collapsed section, or capacity constraint may require a permanent corrective action. Follow-up inspection and documentation turn emergency response into a preventive improvement.
Matching Conditions To Action
Operational decisions become more consistent when agencies define clear triggers and corresponding responses. The following framework can help teams connect field observations with practical next steps.
| Operating condition | Warning signs | Appropriate operator response |
|---|---|---|
| Normal flow and equipment performance | Stable levels, routine pump cycles, no recurring complaints | Continue scheduled inspection and preventive maintenance |
| Increasing sediment or grease | Slower drainage, visible deposits, rising cleaning frequency | Schedule targeted cleaning and investigate the contributing source |
| Unusual wet-well behavior | Rapid level rise, extended pump run times, frequent starts | Verify sensors, inspect pumps and discharge piping, and prepare contingency equipment |
| Suspected blockage | Customer backups, surcharge, odor, or abnormal upstream levels | Dispatch a qualified crew, isolate hazards, clear the restriction, and document the cause |
| Structural concern | CCTV evidence of cracks, offsets, roots, or collapse risk | Restrict exposure as needed and coordinate repair, rehabilitation, or replacement |
| Active or imminent overflow | Surface discharge, bypass, or loss of pumping capacity | Protect people and waterways, initiate emergency procedures, contain the release, and complete required notifications |
This approach works best when operators, supervisors, and managers review the criteria together. Clear escalation points help prevent delayed decisions, especially during storms, power failures, or multiple simultaneous incidents.
Building Skill Through Shared Practice
Collection system work combines technical knowledge, physical fieldwork, regulatory awareness, and communication. Operators benefit from training in hydraulics, pumps, electrical systems, confined-space entry, traffic control, spill response, sampling, and maintenance documentation. Cross-training also helps staff understand how decisions in the collection system affect treatment plant operations.
Professional organizations provide useful opportunities to strengthen these skills. Through LABS of CWEA events, water professionals can find technical presentations, workshops, facility tours, and other gatherings that connect classroom concepts with operating experience. Discussions with peers often reveal practical solutions for recurring problems such as grease management, remote monitoring, emergency bypass planning, and aging infrastructure.
Automation is another growing area of importance. Remote alarms and controls can improve visibility, but they do not replace field verification. Operators need to understand sensor limitations, communication failures, alarm priorities, and manual backup procedures. Training that combines instrumentation knowledge with hands-on troubleshooting prepares teams to respond when technology does not behave as expected.
Strengthening Prevention Across The Utility
Overflow prevention is most effective when it is treated as a shared responsibility. Collection system operators provide essential field intelligence, but engineering, maintenance, customer service, laboratory, regulatory, and management teams all contribute to risk reduction. A reported odor may identify a hydraulic issue; a maintenance record may support a rehabilitation project; a customer education campaign may reduce grease entering the system.
Utilities should create reliable channels for sharing this information. Regular reviews of SSOs, near misses, recurring blockages, pump station alarms, and preventive maintenance results can identify trends before they become widespread. The goal is a learning process in which staff examine causes without losing sight of accountability and public protection.
Recognition also reinforces the value of this profession. Organizations such as LABS of CWEA give water professionals a place to exchange knowledge and celebrate operational excellence. When agencies recognize careful inspections, effective emergency response, and improvements that prevent failures, they strengthen a culture in which prevention is visible and valued.
Practical Priorities For Operators
A focused program can help collection system teams translate knowledge into consistent daily action:
- Review overflow history and prioritize lines, manholes, and pump stations with recurring problems.
- Verify alarms, backup power, level sensors, pumps, valves, and emergency response equipment on a defined schedule.
- Use CCTV, flow data, rainfall information, and work-order history to refine cleaning and inspection frequencies.
- Document the cause, response, cleanup, and follow-up action for every overflow, near miss, and repeated blockage.
- Practice coordinated response procedures through drills that include field crews, dispatchers, supervisors, and communication staff.
These priorities support both immediate reliability and long-term asset planning. They also give supervisors measurable information for evaluating staffing, equipment needs, training gaps, and capital projects.
The role of the collection system operator reaches far beyond clearing blockages. Through observation, maintenance, data interpretation, safe response, and collaboration, operators prevent service disruptions before they reach homes and waterways. Explore the LABS of CWEA events to connect with peers, build technical skills, and bring practical prevention strategies back to your collection system team.