State and Federal Stormwater Regulations
Obligations for Thurston County
The Permit requires the County to develop, implement, and annually
Stormwater Management Program Plan (PDF)
designed to reduce discharges of pollutants from municipal stormwater
systems to protect water quality. This Plan requires the following
- Public education and outreach - A program to
reduce or eliminate behaviors and practices that cause or contribute
to adverse stormwater impacts as well as encourage participation in
- Public involvement and participation - Provide
opportunities for public input in the development and implementation
of the County’s Stormwater Management Program Plan. Ways to get
involve include sharing your comments and ideas directly with the
and participating in our volunteer-based activities. The
County also utilizes a
citizen advisory board to
review and make recommendations regarding issues affecting the County’s
- Illicit discharge detection & elimination -
An ongoing program to prevent, find, and eliminate illicit
connections and illicit discharges into the County’s municipal
stormwater system. This also involves mapping the County’s
stormwater outfalls and discharge points as well as County owned and
operated stormwater treatment, flow control facilities, and
conveyances (i.e., pipes and ditches). Call (360) 867-2099 or
submit a report online
to report spills or suspicious discharges to County’s stormwater system,
streets, and ditches.
- Controlling runoff from new development,
redevelopment, and construction sites - A program to reduce
pollutants in stormwater runoff to the County’s stormwater
system. This program applies to private and public development,
including roads and parking lots. Thurston County’s
Drainage Design and Erosion Control Manual
sets standards for reducing and managing stormwater runoff on new
development and redevelopment projects in the unincorporated areas of
Thurston County. This includes maintenance standards as the County also
inspect private stormwater facilities
to ensure they continue to function properly.
- Operations and
maintenance - An operations and maintenance program to prevent or reduce
pollutant runoff from County owned and operated facilities and municipal
- Total Maximum Daily Loads (TMDLs) - Compliance
with actions contain in applicable
(Generally, a TMDL is a regulatory term describing a value of the
maximum amount of a pollutant that a water body can receive while
still meeting water quality standards.) The Washington State
Department of Ecology develops TMDLs and water cleanup plans for
water bodies not meeting state water quality standards.
Currently, Thurston County has TMDL-related obligations for the
and Henderson Inlet Watershed.
of the Permit contains the County’s TMDL-related obligations.
- Monitoring & assessment - The County meets its monitoring and assessment
obligations by choosing the compliance option that allows paying into a
collective fund to implement a
Regional Stormwater Monitoring Program.
Monitoring elements of this program include: 1) status and trends, 2)
effectiveness studies, and 3) source identification and diagnostic
monitoring. While not an obligation under the Permit, the County also
to help evaluate local water resource conditions.
In addition to developing and implementing these programs, the Permit requires
the County submit submit an an
annual report (PDF) to the
Washington State Department of Ecology documenting the County’s progress
in fulfilling the Permit’s requirements.
Staff contact: Larry Schaffner, (360) 754-4106. E-mail: