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Stormwater Ordinance and Standards
Surface Water Management Plan

The city adopted the surface water management plan as part of the 2030 Comprehensive Plan in January 2010.  Implementation requirements of the surface water management plan call for an update to the city’s stormwater management standards and ordinance to ensure all requirements of the plan are being met. 

Stormwater Management Ordinance and Standards
In the spring of 2015 the city updated its stormwater management standards to meet the requirements of the surface water management plan.  These standards were used as a guide for a new stormwater ordinance, which was adopted by the City Council on May 25, 2015.  Following is a summary of the ordinance:
  • All new development and redevelopment on projects which encompass one-half acre or more of disturbed area or 5,000 square-feet or more of new impervious surface will be evaluated based on the new stormwater requirements;
  • Runoff rates shall not exceed the pre-project runoff rates for the 2-year, 10-year, and 100-year critical duration storm events; 
  • Total suspended solids will require treatment through infiltration practices for runoff volumes of at least 1.1 inch over all new impervious and redevelopment impervious portions of a project;
  • No person shall throw, drain, discharge into the municipal separate storm sewer system any pollutants or waters containing any pollutants other than stormwater.  
  • Coal tar sealers are prohibited (refer to section below). 

Ban on Coal Tar Sealers
The use of coal tar sealers on asphalt driveways is a common practice.  Coal tar sealant products contain polycyclic aromatic hydrocarbons (PAHs), which are a group of organic chemicals formed during the incomplete burning of coal, oil, gas, or other organic substances.  Scientific studies have demonstrated a relationship between the use of these products on stormwater runoff and certain health and environmental concerns.

Links and Contact
Surface Water Management Plan (SWMP) - Link to Comprehensive Plan Chapters       

Stormwater Ordinance (Chapter 18 - Environment)

Stormwater Standards

Coal Tar Sealer Information - Link to U.S. Geological Survey Data

Minnesota Pollution Control Agency - Restrictions on Coal-Tar Based Sealants

Minnesota Stormwater Sediment Removal Guidance


1830 County Road B East • Maplewood, MN 55109 • Ph: (651) 249-2000