Stormwater Management: Midway City vs Santa Ana
How do stormwater management rules compare between Midway City, CA and Santa Ana, CA?
Midway City and Santa Ana have similar restriction levels.
Midway City, 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 Midway City rules →Santa Ana, CA
Orange County
Santa Ana enforces stormwater management regulations under its Municipal Separate Storm Sewer System (MS4) permit issued by the Santa Ana Regional Water Quality Control Board. The city requires construction sites and new development to implement Best Management Practices to prevent pollutants from entering the storm drain system. Post-construction stormwater controls are mandated for qualifying projects under the Orange County NPDES permit.
View full Santa Ana rules →Key Facts Comparison
| Fact | Midway City | Santa Ana |
|---|---|---|
| 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 | - |
| Permit Type | - | NPDES MS4 permit |
| Regional Board | - | Santa Ana Regional Water Quality Control Board |
| BMP Required | - | Construction and post-construction BMPs |
| Contact | - | Public Works — (714) 647-5074 |
| County Permit | - | Orange County area-wide MS4 permit |
Highlighted rows indicate differences between cities.
Midway City 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.
Santa Ana FAQ
What stormwater rules apply to construction in Santa Ana?
All construction sites must implement Best Management Practices to prevent sediment and pollutants from entering the storm drain system. Larger projects require a SWPPP under the state Construction General Permit.
Does Santa Ana require post-construction stormwater controls?
Yes. New development and significant redevelopment must incorporate permanent stormwater treatment controls as required by the Orange County MS4 permit.
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