Management Program
Stormwater Permits and Regulations
A stormwater permit from the Department of Ecology is needed if:
- A construction project will disturb one or more acres on a site, OR, one or more acres will be disturbed as part of a larger plan, AND, if stormwater runoff can leave the site (link).
- An industrial facility has a specific Standard Industrial Code (SIC) and if there is a discharge to a receiving water or MS4 .
- A sand and gravel facility with a specific SIC discharges process water, stormwater, and mine dewatering water associated with sand and gravel operations, rock quarries and similar mining activities, including stockpiles of mined materials, concrete batch operations, and hot mix asphalt operations.
In Yakima County, an excavation and grading plan is required for excavations except as noted in Yakima County Code section 13.05.160. A site drainage plan is required to provide adequate drainage for short or long subdivisions in the County (14.48.100). The plan shall provide for the on-site detention and/or retention of the total water intercepted and collected by the development for the 10-year design storm. All runoff from commercial and private road approaches must be contained on site (10.08.070) as well.
In the City of Yakima, an excavation and grading plan is required for excavations except as noted in Yakima City Code section 11.04.3306.2. Plans, including drainage, are required for public projects in the City of Yakima (15.11.050).
A drainage plan is required for subdivisions in the City of Union Gap 17.11.020. Grading and drainage information is required for all permit categories as described in Union Gap City Code section 9.34.070.
An Erosion and Sedimentation Control Permit (Ord. 1630, 1988) is required “to grub, clear, grade, fill, excavate, quarry, mine and/or stockpile soil on any property” within the City of Sunnyside or to improve or develop any property there.
An ordinance requiring construction and post-construction best management practices (BMPs) must be adopted by the regional co-permittees no later than February 16, 2010.