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Stormwater Protection

Stormwater pondStormwater Management

Stormwater treatment mechanisms at the port include a stormwater detention pond, a biofiltration swale, a biorention system and two Vortechs hydrodynamic separation units. The port's stormwater is permitted under two National Pollutant Discharge Elimination System (NPDES) permits through the Washington State Department of Ecology. These permits are as follows:

Western Washington Phase II Municipal Stormwater Permit

This permit covers all stormwater on port property that is served by the port's municipal separate storm sewer system (MS4). In order to comply with this permit, the port has began to develop its Stormwater Management Program (SWMP), which includes the six program components required by the permit:

  • Public education and outreach
  • Public involvement and participation
  • Illicit discharge detection and elimination (IDDE Policy)
  • Construction site stormwater runoff control
  • Post-construction stormwater management in new development and redevelopment
  • Pollution prevention and good housekeeping for municipal operations.

The program is designed to reduce stormwater impacts to water quality protected by the Clean Water Act. To review the permit on the Deparment of Ecology's website click here.

This program requires tenant involment for compliance. Tenants of the port will be informed of these requirements in the coming months through public outreach efforts as required by the permit. As a result, tenants are required to comply with the port's Illicit Discharge Detection and Elimination (IDDE) policy. Please see the latest version of the port's Stormwater Management Program (SWMP) for details

Industrial Stormwater General Permit

This permit covers the stormwater from the port's vehicle maintenance shop and fueling station. To review the permit on the Department of Ecology's website, click here.



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