Stormwater Management: Anza vs Riverside
How do stormwater management rules compare between Anza, CA and Riverside, CA?
Anza and Riverside have similar restriction levels.
Anza, CA
Riverside County
Riverside County operates under two NPDES Municipal Separate Storm Sewer System (MS4) permits: the Santa Ana River Region permit (R8-2010-0033) and the Whitewater River Region permit (R7-2013-0011), plus the San Diego Region permit in the southwest. All construction over 1 acre requires a state SWPPP, and new development must implement LID BMPs.
View full Anza rules →Riverside, CA
Riverside County
Riverside enforces stormwater regulations under its Municipal Code and the Santa Ana Regional Water Quality Control Board MS4 permit. The city requires Low Impact Development (LID) standards for new development and redevelopment projects. Construction sites disturbing one acre or more must prepare a Stormwater Pollution Prevention Plan (SWPPP). Post-construction BMPs must treat stormwater quality volume before discharge to the Santa Ana River watershed.
View full Riverside rules →Key Facts Comparison
| Fact | Anza | Riverside |
|---|---|---|
| - | - | |
| Permit Authority | - | Santa Ana RWQCB MS4 permit |
| LID Required | - | For new development and redevelopment |
| Construction SWPPP | - | Required for 1+ acre disturbance |
| Watershed | - | Santa Ana River |
| Post-Construction | - | Water quality treatment BMPs required |
Highlighted rows indicate differences between cities.
Anza FAQ
Riverside FAQ
Who regulates stormwater in Riverside?
The City of Riverside manages stormwater under an MS4 permit from the Santa Ana Regional Water Quality Control Board. The Public Works Department enforces stormwater quality requirements for construction and development.
What are LID requirements in Riverside?
Low Impact Development standards require new projects to incorporate on-site stormwater treatment such as bioretention, permeable pavement, and infiltration facilities to treat runoff before it enters the storm drain system.
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