We are committed to providing equal opportunities, resources, and access to all Washingtonians, regardless of abilities or circumstances.

You can use an address to look up your watershed, also known as a Water Resource Inventory Area (WRIA). We typically study and regulate water resources by WRIAs. There are 62 WRIAs in Washington.

Ocean acidification is a global problem with local impacts. The impact of greenhouse gases on rising temperatures, coupled with excess nutrients from nitrogen and carbon, can hinder healthy aquatic ...

EIM Data Analysis Tool (EDAT) is an analysis tool for Model Toxics Control Act (MTCA) practitioners and other contamination cleanup professionals. It compares Washington State environmental monitoring ...

CLARC February 2025 updates are now online. We made updates to incorporate newly published IRIS toxicity values for arsenic and PFHxS and associated noncancer effects information. We also updated ...

The easiest way to avoid food waste is to not overbuy. Proper storage of what you do purchase is another way to prevent food waste. Home composting is an excellent option for what can't be used or ...

We propose updates to the human health criteria in Table 240 of WAC 173-201A-240, Toxic substances, to: Replace 143 state-adopted human health criteria for 73 pollutants that the Environmental ...

Federal, state, tribal, and local agencies have important roles to make sure Washington's air monitoring network collects accurate data. We have established required procedures and quality assurance ...

Ecology is responsible for regulating chemical and hazardous waste cleanup under the Resource Conservation & Recovery Act. Although it is a federal law, we have a charter to enforce it in our state.

The Trust Water Rights Program enables us to hold existing water rights in trust without the risk of relinquishment. Water rights held in trust retain their original priority date while contributing ...

Phases out the use of copper in vehicle brakes and requires manufacturers to certify that brakes comply with the law. Regulates lead, cadmium, phthalates, and other chemicals in children's products.