Contact Information

James Carr
Wastewater Treatment Manager
4827 Chico River Road
Chico, CA 95928

Office (530) 894-4300

Wastewater Discharge Permit - allows for discharging treated wastewater of large volumes to the Plant. This permit is issued for a maximum of one (1) year.

Wastewater Survey-New to Chico? Help us determine if your new industrial/commercial business in Chico could affect the Plant.

Sewer Overflow Reporting

If you witness a sewer overflow, report it here.








City of Chico Water Pollution Control Plant (WPCP)


We are accepting gray/domestic wastewater from the responder camps in an effort assist cleanup efforts. Download the permit application and pay the application fee.

Trip tickets, bill of lading or manifest containing the Waste Origin, Volume, Company Name and Truck ID# is required per load discharged at the Plant. Plant property discharge point open Monday-Friday, 7:00 AM-3:30 PM.


The City of Chico operates and maintains a modern 12 MGD capacity, secondary treatment, activated sludge, wastewater treatment plant with future expandability to 15 MGD capacity. The plant operates under strict waste discharge requirements permitted by the California Water Resources Control Board. The discharge location for the treated wastewater (effluent) is the Sacramento river.

Our state-certified, full environmental laboratory at the WPCP daily tests the plant effluent to ensure that its quality meets state standards.

The WPCP operations staff operate and maintain fifteen sewer lift pump stations that pump wastewater from areas in the city that do not have the ability to gravity flow through the wastewater collection system.


The WPCP operates a 1.1 Megawatt, Solar Photovoltaic facility providing electric power to the WPCP, which reduces the plant's use of utility power by approximately 35%. This solar facility is one of the largest in the nation to be installed at a wastewater treatment plant. Also, a 335-kilowatt co-generator is on site that uses methane produced by the plant processes as a fuel source to produce electricity which is used at the WPCP. The treatment plant produces nutrient-rich biosolids by processing the domestic wastewater received from households in the service area. Biosolids, all 3,700 tons/year of them, are placed back into the environment in a useful way by recyling them in land use applications.

Pretreatment Program

The Chico Industrial Pretreatment Program (CIPP) is located at the WPCP. The CIPP program permits and controls wastewater discharges from businesses and industry that could potentially be harmful if allowed to be discharged into the environment.

Private Sewer Lateral Problems

The property owner owns and is responsible for maintaining the entire sewer lateral from the plumbing in the property owner's buildings, up to and including the connection to the sewer main in the street. If there is a clog in the sewer lateral, it is the property owner's responsibility to clear it. City crews are not allowed onto private property in order to clean or maintain privately owned sewer laterals.