Downey is subject to LA County MS4 NPDES permit requirements for stormwater management. New development and significant redevelopment must implement Best Management Practices (BMPs) for stormwater quality.
Downey enforces stormwater management regulations to prevent flooding and protect water quality. New construction and major renovations must include stormwater management plans. Impervious surface limits may apply in residential zones. Low-impact development techniques like rain gardens, permeable pavers, and bioswales are encouraged or required. Erosion and sediment control plans needed during construction. Post-construction stormwater facilities must be maintained by property owners. Municipal separate storm sewer system (MS4) permits govern city-wide discharge.
Failure to implement stormwater plan: stop-work order. Illicit discharge to storm drains: fines $500 to $10,000. Maintenance failures: notice and fines after non-compliance.
Downey, CA
Downey regulates leaf blower noise under its general noise ordinance. Gas-powered leaf blowers must comply with the 85 dBA construction equipment limit and o...
Downey, CA
Downey prohibits amplified music that exceeds ambient noise levels by more than 5 dBA at the property line. Quiet hours from 10 PM to 7 AM carry stricter lim...
Downey, CA
Industrial noise in Downey must not exceed established ambient levels by more than 5 dBA at the receiving property line. Corrective factors apply during dayt...
Downey, CA
California law (AB 1236) requires streamlined permitting for EV charging stations. Downey must provide expedited permits for residential EVSE installations. ...
Downey, CA
Driveway modifications in Downey require approval from Planning and possibly Engineering. Paving projects in the front yard area must meet development standa...
Downey, CA
Downey restricts oversized vehicle parking on public and residential streets. RVs must obtain permits under DMC 3182.5. Emergency parking allowed for 24 hour...
Side-by-side rule comparisons with other cities in Los Angeles County.
See how other cities in Los Angeles County handle stormwater management.
See how Downey's stormwater management rules stack up against other locations.
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