Stormwater Management Program Plan

Under the Federal Clean Water Act, counties and municipalities are required to reduce the amount of stormwater pollution entering our waters. Each government agency is issued a stormwater permit. This permit is called a National Pollutant Discharge Elimination System (NPDES) permit.

Mobile County is designated by the United States Environmental Protection Agency (EPA) and the Alabama Department of Environmental Management (ADEM) as an owner/operator of a Phase II municipal separate storm sewer system (MS4). This requires Mobile County to develop a stormwater management program designed to protect water quality and to prevent harmful pollutants in stormwater runoff from entering the MS4 area. Stormwater runoff is rainfall that does not seep into the ground but runs off over our yards, streets, parking lots, and buildings. The runoff then enters our storm sewer system which flows directly into creeks, rivers, bays and the Gulf of Mexico.

The County received its current Phase II Stormwater NPDES permit on October 1, 2016. The current permit coverage will expire on October 31, 2021. Requirements of the permit include:

  • Identify major sources of stormwater pollution (mapping for source tracking)
  • Reduce pollutants in runoff from industrial, commercial, and residential areas (enforcement and drainage system maintenance and cleanup)
  • Control stormwater discharges from new development and redevelopment areas (inspections and site plan process)
  • Implement a water quality monitoring program

The intent of the Phase II regulations is to reduce the adverse impacts to water quality and aquatic habitat by controlling unregulated sources of stormwater discharges. In order to comply with these regulations Mobile County must satisfy specific "minimum control measures," including:

  • Public Education and Involvement
  • Illicit Discharge Detection and Elimination
  • Construction Site Runoff Control
  • Post-Construction Stormwater Management
  • Pollution Prevention/Good Housekeeping

To learn more about Mobile County Storm Water Management Program, please see the links below:

For more resources about the water quality and natural resources, please visit:

To report stormwater runoff problems, please call: 251-574-6511
Or Email:

Storm Water Management Program Plan(SWMPP) (14MB PDF)

2016 Annual Report (42MB PDF)

2016 Permit (1.5MB PDF)

This web page will be updated with more information soon. Please check back soon.