Welcome to the Stormwater Management Home Page

Mission Statement:
Provide our customers with reliable and quality service at an affordable rate while protecting public health, natural resources, and receiving waters while and producing high quality effluent that meets or exceeds local, state, and federal standards.


The Storm Drainage System—The Source of Storm Water and its Destination

Storm water is water from rainfall that flows over land into the City’s drainage system.  The drainage system includes:

  • 1,685 catch basins
  • 164 manholes
  • 83 outfalls
  • Over 29 miles of conveyance lines
  • Over 8 miles of open ditches

In addition to this constructed stormwater system, Normandy Park includes parts of four creek basins and over 4 miles of stream channel in:

Stormwater runoff and groundwater affect water quality, water quantity, and habitat in these streams.  This in turn affects fish, birds, and wildlife.  There also is stormwater that flows directly into Puget Sound from areas of the city close to the marine shoreline.

Regardless of how it gets there, stormwater from Normandy Park influences the overall health of Puget Sound.

National Pollutant Discharge Elimination System (NPDES) Permit
A stormwater permit issued to the City by the Department of Ecology that requires Normandy Park to comply with stormwater regulations designed to reduce stormwater runoff. 

The permit requires the City to implement a stormwater planning program to inform and assist in the development of policies and strategies as water quality management tools to protect receiving waters.  The Stormwater Management Plan (SWMP) includes the following components:

  1.  Stormwater Planning
  2.  Public Education and Outreach
  3.  Public Involvement and Participation
  4.  Mapping and Documentation
  5.  Illicit Discharge Detection and Elimination
  6.  Controlling Runoff from New Development, Redevelopment and Construction Sites
  7.  Operations and Maintenance
  8.  Source Control Program for Existing Development

An ongoing mapping program for mapping and documenting the Municipal Separate Storm Sewer (MS4) allows staff to maintain data for stormwater features.  This map will also help with ongoing efforts to prevent, detect, characterize, trace, and eliminate illicit connections and illicit discharges into the MS4.

Normandy Park Stormwater Management Map

We Need Your Help
Everything that enters our constructed or natural drainage system finds its way into Puget Sound. Please do your part to preserve water quality and protect the environment today and for future generations:

  • Employ Natural Yard Care
  • Never pour oil, antifreeze, or paint on the ground or into a storm drain.
  • Dispose of household hazardous waste properly.
  • Keep soapy water out of storm drains by going to a commercial car wash or rinsing off the suds in a grassy area.
    • Rent a Car Wash Kit: A FREE Car Wash Kit is available at City Hall.  The SudSafe Car Wash Kit captures washwater before it enters the storm drain and pumps it to either a grassy area or sewer. Detailed instructions are included in the kit.  Enjoy a clean car while knowing you are helping keep our creeks, streams, and waterways clean. (A $50 refundable deposit is required)
  • Direct rain water appropriately so it can percolate into the soil. (This may not be appropriate for homes at the tops of bluffs or steep slopes.)
  • Become a better steward today – see Tips on How You Can Help Miller/Walker Creeks.

Thanks for doing your part to help keep the city of Normandy Park and Puget Sound clean, healthy, and beautiful!