Our mission is to keep Washington waters clean. Use this site to find out if a lake, stream, or marine beach near you is healthy or polluted. Learn about water cleanup plans and how we’re addressing stormwater runoff, promoting good wastewater management, and protecting wetlands that are important for habitat and flood control. Explore the connections between underground aquifers and surface water. Read why our scientists are concerned about changing trends in Puget Sound’s water quality.