Stormwater pollution happens when rain and runoff pick up contaminants from streets, businesses, construction sites, and yards, then flow through storm drains directly into local waterways without treatment. Common pollutants include motor oil, anti-freeze, pesticides, fertilizers, paint waste, trash, and pet waste. These pollutants harm drinking water, wildlife, and public health.

How to Prevent Stormwater Pollution

• Clean paint tools indoors; never rinse paint into gutters or streets.
• Leave grass clippings on your lawn (grasscycling) or place yard waste in green bins.
• Avoid over‑watering to prevent runoff carrying chemicals into storm drains.
• Always pick up pet waste—rain can wash bacteria into waterways.

Reporting Problems

• Emergency dumping or hazardous spills: Call 911
• Non‑emergency stormwater violations: Call 562-904‑7202.

Commercial & Industrial Requirements

Businesses in Downey must comply with the Los Angeles Region MS4 NPDES Permit. The City maintains an inventory of facilities and conducts unannounced inspections to ensure required Best Management Practices (BMPs) are in place.

Construction & Land Development

Projects disturbing soil must use erosion and sediment controls. Sites disturbing 1 acre or more must obtain coverage under the State’s Construction General Permit.

City Stormwater Services

The City maintains:

• 33 miles of storm drains
• 2 stormwater lift stations
• 6 dry wells
• Debris removal, weed abatement, vacant property board‑ups, shopping cart retrieval, and street sweeping

Stormwater Projects & Funding

Downey participates in regional and local stormwater programs funded by:

• City fees
• General Fund
• Safe Clean Water (Measure W) program

Project status and spending information is available through Los Angeles County’s reporting modules and the Safe Clean Water website.

City of Downey
Public Works Department - Utilities
11111 Brookshire Ave
Downey, CA 90241
562-904-7202