The Walla Walla basin extends into both Washington and Oregon, and crosses Tribal boundaries. The basin has a long history of challenges with water availability, including over appropriation of water ...

Washington's ocean and shorelines are integral to the regions character, quality of life, and economic viability. We work in partnership to protect and restore important habitats and ocean resources, ...

We estimate there are thousands of abandoned wells in Washington. If you find an abandoned well on your property, you are required to work with a licensed well driller to properly close it up, a ...

Old orchards in Central Washington left lead and arsenic in soil. Builders must check land history, test soil, cleanup ...

Excessive levels of nutrients from human sources, such as nitrogen and carbon, are negatively impacting water quality in Puget Sound. This can lead to low dissolved oxygen, which impacts the health of ...

Businesses that use hazardous products need to learn how to handle empty containers. Containers that hold dangerous waste — such as solvents, paints, and pesticides — must be managed as dangerous ...

Dangerous substances can spill to land, water, or air. The sooner a spill is reported, the sooner we can respond. Failure to report a spill you're responsible for could result in penalties.

Rainwater collection, including the use of rain barrels, has become more popular as a supplemental source of water. In 2009, we issued a rainwater use interpretive policy, which clarifies that you may ...

Many businesses in Washington generate some type of dangerous waste — waste that is harmful to human health and the environment. Businesses must: Follow the Dangerous Waste Regulations. Properly ...

The Yakima Basin is home to 400,000 people and a $4.5 billion agriculture industry. With warming winter temperatures threatening aquifers and snowpack, the Basin is facing the challenges of water ...

We track ozone pollution in current air quality conditions (map). We monitor ozone at 13 locations to make sure levels are in the healthy range. Currently, all areas of Washington meet the national ...

We finalized the South Fork Nooksack temperature total maximum daily load (TMDL) report in Feb. 2020. A public comment period on the draft TMDL report took place from Sept. 12 through Nov. 20, 2018.