Stormwater Program

Public Comment Notice

The City of Chandler is required to prepare and maintain a Stormwater Management Program (SWMP) that assists the City in complying with the Arizona Pollutant Discharge Elimination System (AZPDES) General Permit for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems (MS4) To Waters of the United States.

The SWMP provides an overview of the Best Management Practices (BMPs) designed to reduce the discharge of pollutants from the MS4 and protect water quality to eliminate or minimize pollutants getting into stormwater and entering receiving waters.

The City welcomes the public to participate in the review and implementation of the SWMP.

This announcement starts a 30-day public comment period. The City will then compile the comments, and use them to assist in revising the program with the purpose of continuous improvement of the Stormwater Management Program. The SWMP is anticipated to be revised with the appropriate changes during Fiscal Year 2020/21.

Stormwater Management Program

Comments may be submitted via email to David Verhelst.  


City Retention Basin

What is stormwater? Stormwater is runoff and surface flows generated from rainfall events.

The City's Stormwater Program helps educate the community on environmental regulations. Chandler works with state and federal regulators to make sure residents understand the effects of stormwater drainage and how to reduce pollutants into the storm drain system.

The City offers free presentations about stormwater pollution prevention for schools, community groups, homeowners and neighborhood associations. Call 480-782-3503 for information.


When it rains in urban areas, the stormwater runs off buildings and paved areas instead of soaking into the ground. The stormwater collection system, also known as the storm drain system, is designed to move stormwater flows along conveyances like city streets and gutters where it is directed into storm drains or spillways constructed along the street, and eventually deposited into retention basins, greenbelt areas, parks and lakes within the community.

No. The stormwater collection system is completely separate from the sanitary sewer system connected to our homes and businesses. The sanitary sewer system delivers wastewater from our sinks, showers, toilets, and washing machines to a wastewater treatment facility where the wastewater is treated and either reused or recharged to groundwater. Stormwater runoff collected in stormwater collection systems is not treated before it infiltrates to groundwater or is discharged to retention basins, greenbelt areas, parks and lakes within the community.

Common pollutants found in stormwater may include but are not limited to, pesticides, fertilizers, litter, pet waste, petroleum products, automotive fluids, paints, solvents, yard waste, sediment, chemicals, and other materials.