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In compliance with the Maine Department of Environmental Protection's General Permit for the Discharge of Stormwater from Small Municipal Separate Storm Sewer Systems (MS4), the City updated our Stormwater Management Plan (SWMP). Please see the City Clerk to review a printed copy of the SWMP at City Hall. 


2022 MS4 General Permit Now in Effect

The Maine Department of Environmental Protection's Municipal Separate Storm Sewer System ("MS4") General Permit went into effect on 7/1/22.  There are several new provisions that provide more protections to water resources.  Some of these provisions include:

  • Conduct analytical water quality monitoring for stormwater outfalls to determine if prohibited discharges are occurring.
  • Remove verified prohibited stormwater discharges within 60 days of discovery (or develop an expeditious mitigation plan if removal within 60 days is infeasible).
  • Establish an Erosion & Sediment Control Ordinance or other regulatory mechanism to minimize sediment discharge from construction projects by 7/1/23.
  • Establish a Low Impact Development Ordinance or other regulatory mechanism to provide more stormwater treatment for redevelopment and new development projects by 7/1/24.

For more information please review the City's Stormwater Management Plan and/or contact the Stormwater Program Coordinator.


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DEP Reminds Mainers of What Not to Flush



Committed to safeguarding the health of South Portland's watersheds and Casco Bay by providing cost-effective & efficient water resource protection services


Trout Brook Nature Preserve


111 Waterman Drive (Water Resource Recovery Facility)

1142 Highland Avenue (Collection System Division)

767-7675 - Telephone 767-5697 - Fax Monday-Friday 7:00 a.m. - 3:30 p.m.