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Municipal Stormwater Permit jurisdiction areas for Phase I and Phase II permits, issued by the Washington State Department of Ecology. The Phase I permit regulates discharges from municipal separate storm sewers owned or operated by Clark, King, Pierce and Snohomish Counties, and the cities of Seattle and Tacoma. The Phase II Municipal Stormwater Permit rule extends the coverage of the National Pollutant Discharge Elimination System (NPDES) program to certain \"small\" municipal separate stormwater sewer systems (MS4s). These permit areas incorporate 2019 updates to incorporated City boundaries and unincorporated Urban Growth Areas (UGA) as defined by the Growth Management Act, as well as 2010 Census extents for urbanized areas adjacent to permitted cities and UGAs. This dataset was last updated in 2019. 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These polygon features represent the TMDL projects managed by the Washington State Department of Ecology. The boundaries show where the TMDL project applies and is being implemented. TMDL Boundaries identified as \"In Development are considered draft and are subject to change when the TMDL has been approved by the U.S. EPA. Boundaries are representations of each particular project and does not replace the official version of the approved TMDL report. Please see the TMDL Project webpage for specific information about that project. TMDL projects are required by the Federal Clean Water Act to identify pollution sources and pollution load reductions needed for water bodies to meet water quality standards. 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The Washington State Department of Ecology (Ecology) Water Quality Program undertook the Nitrate Prioritization Project in 2014 (Morgan, 2014) because of growing concerns about groundwater contamination by nitrates, and the inability to display and evaluate nitrate data on a statewide basis. <\/SPAN><\/SPAN><\/P>

This report originated from the agriculture and water quality talks that took place in 2012. Participating agencies agreed that if data exists, everyone should be able to see it in one central location. Agencies that contributed included the Washington Dept. of Ecology, Washington Dept. of Health, Washington Dept. of Agriculture, U.S. Environmental Protection Agency, U.S. Natural Resource Conservation Service, U.S. Geological Survey, and the Washington Conservation Commission. <\/SPAN><\/SPAN><\/P>

The Safe Drinking Water Act nitrate limit for delivery of water from public water systems is 10 mg/L. This limit has been exceeded in public water supplies and private wells in various areas of the state going back decades. Not only is contaminated groundwater a public health issue, treatment is also very costly to the public water supply systems and individual households who must deal with contamination on their own. <\/SPAN><\/SPAN><\/P>

The goals of this project were to: <\/SPAN><\/SPAN><\/P>