Total Maximum Daily Loads (TMDLs)

laboratoryBeyond general efforts to improve water quality, the City has additional requirements to improve impairments in local waterbodies. When waterbodies exceed water quality standards, as established by both the federal and state governments, a Total Maximum Daily Load (TMDL) may be required for that waterbody. A TMDL is a calculation of the total amount of a pollutant that a waterbody can receive to meet water quality standards. TMDLs require the development of a strategic plan and implementation schedule outlining how stakeholders will meet water quality standards.

The City of Riverside is currently involved in two TMDLs:

  • Santa Ana River-Reach 3 for pathogens

The stretch of the Santa Ana River near the City of Riverside, called SAR Reach 3, is listed by US EPA as impaired for pathogens (bacteria). In 2006, a pathogen TMDL was approved with the City of Riverside (along with various other entities) named as a stakeholder. A task force was created whereby all stakeholders could identify sources of pollution and ways to mitigate the problem. In 2012, the Santa Ana Regional Water Quality Control Board (SARWQCB) approved the Comprehensive Bacteria Reduction Plan (CBRP), which outlines how stakeholders plan to meet the requirements of the TMDL.

  • Lake Elsinore and Canyon Lake for nutrients

A small portion (about 500 acres) of the City of Riverside is located in the San Jacinto Watershed which drains to Canyon Lake and Lake Elsinore. These two waterbodies are named together in a nutrient TMDL that was approved in 2004. Stakeholders, including the City of Riverside, are working as a task force to identify the sources of pollution and ways to mitigate the problem. The stakeholders have completed a Comprehensive Nutrient Reduction Plan (CNRP)

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Other Wastewater Resources
General Information
Riverside Regional Water Quality Control Plant (RRWQCP)
5950 Acorn Street
Riverside, CA 92504

Phone: (951) 351-6140

Admin Hours:
Hours: M-F 7:30 am-4:30 pm  
Closed on Weekends and Major Holidays
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