*Latest News* (February 27, 2019)

The Washington Department of Ecology has completed the update of the Stormwater Management Manual for Eastern Washington.  The update can be found on Ecology's website.

Stormwater is rainfall or snow melt that runs off the roofs of our houses, driveways, businesses, streets, parking lots, lawns and other surfaces. When we replace vegetated land with surfaces that water can't penetrate [such as streets, parking lots, and rooftops], rainwater and snowmelt no longer soak into the ground. This results in an increase in surface water runoff. When this occurs, stormwater washes along or dissolves materials in its path, becoming a transportation system for pollutants. Storm drains collect this stormwater runoff and discharge it to streams, rivers or groundwater.

Because of the pollutants collected during runoff, stormwater can be a source of ground and surface water pollution. Stormwater runoff can contain sediments, metals (copper, cadmium, chromium, lead, zinc, etc.), nutrients (phosphorous and nitrogen), salts, petroleum products, food wastes, and coliform bacteria, to name a few. When introduced to groundwater, streams and lakes, these pollutants and debris prove toxic to plant and animal life, affect recreational activities such as boating and swimming, and can even increase flooding conditions.

Reporting a Stormwater Problem

If you are looking for assistance with road flooding, plugged road culverts, cleaning of storm drains, other "maintenance" type issues, or you want to report illegal discharges of oil, sediment, garbage, or other pollutants into surface waters or stormwater facilities, please call our Hotline number. To report an issue after normal business hours, please call the non-emergency dispatch (after hours) number.

General Information

Business Information

Designer and Developer Information

Construction Contractor Information


Regulations pertaining to the Stormwater Utility and Stormwater Program are contained in the City of Walla Walla Municipal Code by subject as listed below:

NPDES Phase II Permit

The National Pollutant Discharge Elimination System (NPDES) is a permit program established by the Clean Water Act (CWA) of 1972 to regulate point source discharges of water pollution. Because impairment of so many of America's waterways was linked to polluted stormwater runoff, Congress amended the CWA in 1987 to also establish NPDES requirements for stormwater discharges.

Currently, there are three main types of NPDES stormwater permits: Construction, Industrial, and Municipal. All require planning and active management of stormwater using best management practices (BMPs).

The City of Walla Walla received an initial National Pollutant Discharge Elimination System (NPDES) Phase II Municipal Stormwater Permit in 2007 and was issued a new permit in August 2012. In the State of Washington, NPDES permits are issued by the Department of Ecology (DOE) in accordance with EPA regulations.

The City of Walla Walla developed and implemented a Stormwater Management Program as described below In order to reduce the discharge of pollutants to surface and groundwater.

Stormwater Management Program

Under the Permit, the City of Walla Walla is required to implement a Stormwater Management Program consisting of tasks associated with six minimum control measures:

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

Stormwater Management Documents

To access any of the following documents from our online document server, select the Public Works folder, Public Documents folder, and then the Stormwater folder:

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