Anaheim vs Mission Viejo
How do stormwater management rules compare between Anaheim, CA and Mission Viejo, CA?
Anaheim has fewer restrictions than Mission Viejo.
Anaheim, CA
Orange County
Anaheim participates in the North Orange County stormwater program under the MS4 permit regulated by the Santa Ana Regional Water Quality Control Board. New development must incorporate stormwater BMPs.
View full Anaheim rules →Mission Viejo, CA
Orange County
Orange County enforces stormwater quality under two Phase I NPDES MS4 Permits issued by the Santa Ana and San Diego Regional Water Quality Control Boards. Title 9 of the OCCO (Water Quality) and the NPDES program require all construction and development projects in unincorporated areas to implement Best Management Practices (BMPs) and submit a Water Quality Management Plan (WQMP) before grading or building permits are issued.
View full Mission Viejo rules →Key Facts Comparison
| Fact | Anaheim | Mission Viejo |
|---|---|---|
| Permit | North OC MS4 | - |
| WQMP | Required for new dev | - |
| Board | Santa Ana RWQCB | - |
| Watershed | Santa Ana River | - |
| Governing Code | - | OCCO Title 9 / NPDES MS4 Permits |
| WQMP Required | - | Before grading/building permit |
| ESCP Required | - | All grading plan submittals |
| Permittees | - | 34 co-permittees countywide |
| Enforcement | - | OC Public Works / RWQCB |
Highlighted rows indicate differences between cities.
Anaheim FAQ
What stormwater permits does Anaheim require?
New development must prepare a WQMP with stormwater BMPs. The city operates under the North OC MS4 permit from the Santa Ana Regional Water Quality Control Board.
Can I wash my car and let water run to the storm drain?
No. Only rainwater should enter storm drains. Wash cars on permeable surfaces or at commercial car washes that recycle water.
Mission Viejo FAQ
Do I need a stormwater plan for construction in unincorporated Orange County?
Yes. All non-exempt construction projects must submit a Water Quality Management Plan (WQMP) and an Erosion and Sediment Control Plan (ESCP) before obtaining grading or building permits from OC Development Services.
Who enforces stormwater regulations in unincorporated Orange County?
OC Public Works and the Regional Water Quality Control Boards (Santa Ana for North OC, San Diego for South OC) enforce NPDES stormwater requirements. The H2OC program coordinates regional compliance.
Compare other topics
See how Anaheim and Mission Viejo compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool