When the comment period ends, we'll review the comments received and make a final decision on issuing the permits.

Above, left to right: Ifeanyi Isigwe, Ecology toxics reduction engineer, works with Systems Interface’s Steven Hill, project engineer, and Matt Baker, strategy manager, to review, evaluate, and assess ...

Comment on the proposed complexity level for air operating permit fees. The 2024 annual fee reflects permit-related costs between July 1, 2024 – June 30, 2025. three-tier fee structure. One of these ...

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 ...

c. Is the site part of a migration route? Consider birds, fish, and other wildlife when identifying affected migration routes. Your proposal could have an adverse impacts if the affected area includes ...

How mercury enters fish as methylmercury in freshwater systems. Mercury is toxic in any form and can persist in the environment. In Washington, most people are exposed to mercury through eating ...

Proficiency testing sample providers must comply with the most current proficiency standards to be recognized by our laboratory accreditation program. Six providers of Proficiency Testing (PT) samples ...

*This is the corrected chemical name. The name will be updated in WAC 173-334-130 during the next rulemaking.

Casey Sixkiller was appointed by Governor Bob Ferguson as the 14th Director of the Washington State Department of Ecology. With more than two decades of experience in federal, Tribal, regional, and ...

On this page you will find nonpoint project funding requirements and resources for the Water Quality Combined Funding Program, including forms, pollutant load reduction reporting tools, and other ...

If you have a low-risk site that meets specific criteria, you might be able to use a model remedy for your cleanup. Model remedies are pre-approved ways to clean up certain types of contamination in ...

Wildfire smoke is a major threat to human health. Smoke from wildfires is the largest source of particle pollution in Washington. Breathing in smoke causes wheezing and coughing, heart and lung ...