Sanitary Sewer
The City of Lathrop Maintenance Division provides round the clock sewer maintenance services for our community. Overall, the sewer system consists of the:
- The Manteca-Lathrop Water Quality Control Facility
- The Lathrop Consolidated Treatment Facility
- The Collection System
- The Pump Station System
Manteca-Lathrop Water Quality Control Facility (WQCF)
The City of Lathrop owns 14.7% of the Manteca-Lathrop WQCF by Contract with the City of Manteca. The City of Lathrop, however, does not participate in the operation of the Plant. Most of the wastewater generated in the areas east of Interstate 5 and north of Louise Avenue is conveyed to the Manteca-Lathrop WQCF.
The Lathrop Consolidated Treatment Facility
Daily operations of the Lathrop CTF are contracted to a private contractor, Veolia Water NA. In August 2015, the City began diverting wastewater from the Crossroads area to the Lathrop CTF and decommissioned the adjacent Crossroads wastewater treatment facility (WWTF). The Lathrop CTF was previously known as Water Recycling Plant No. 1 (WRP-1) and was expanded from a total capacity of 0.75 MGD to 1.0 MGD average dry weather flow (ADWF) in 2015. In summer 2018, the City completed a Phase 2 Expansion of the facility to a total capacity of 2.5 MGD ADWF to accommodate future growth in the Mossdale, Central Lathrop, and River Islands development areas. The Lathrop CTF is permitted for a maximum capacity of up to 6.0 MGD with additional expansions.
Collection System
The City Staff maintains many thousands of feet of sewer lines which are cleaned all year long to prevent overflow or spillage. If a problem occurs with a sewer line, the line is evaluated to find the source of the problem. When appropriate, a sewer line will be placed on the "hot spot" list to be cleaned on either a monthly, bi-annual or annual basis. When possible, repairs or design modifications are made so that these "hot spots" can be put on a normal cleaning schedule.
Every new sewer line within the City of Lathrop is inspected during construction. The contractor will follow a vigorous inspection program before the City will accept the line, which ensures that the City receives a high quality product. This reduces future maintenance costs.
Pump/Lift Station System
The City of Lathrop is relatively flat. Therefore, a series of “pump” stations and “lift” stations are required to convey the influent to one of the two treatment plants. For the areas of the City east of Interstate 5, the collection system conveys the influent to the “O” Street Pump Station which then pumps it to the Manteca-Lathrop WQCF. This pump station is of the utmost importance to the City and, therefore, receives a high level of service and engineering attention.
For the areas of the City west of Interstate 5, the collection system conveys the influent to the Mossdale Pump Station which then pumps it to the Lathrop Consolidated Treatment Facility. This pump station is also of high importance to the City and, also has received a high level of engineering attention.
The flow from our pump stations and other information regarding the system is monitored by radio telemetry. Information such as flow, pump run time, power usage, and many other parameters are collected using Supervisory Control and Data Acquisition (SCADA) software. The central SCADA computer monitors the system and, if necessary, can be used to control the pump stations. It also has the ability to page standby personnel during emergency conditions.
