To reduce the severity and duration of major and catastrophic floods that occur in the Chehalis River basin in southwest Washington, the Chehalis River Basin Flood Control Zone District (Flood ...

We're updating requirements for protecting water quality when washing and maintaining bridges and ferry terminals.

Commercial and industrial businesses that emit large amounts of air pollution must get an air operating permit. An air operating permit is a master document that lists all of the air pollution ...

Clean air is vital for everyone. We manage smoke, vehicle pollution, industrial emissions, and other pollutants so communities have healthy air to breathe. We do this through permits, regulations, and ...

This is the list of rules we are authorized to implement. They are sorted by topic. Each rule links to official rule language on the Washington State Legislature's Code Reviser's web site. The Office ...

We invite you to review and comment on the Chehalis River Basin SEPA revised draft environmental impact statement. We have opened a 75-day public comment period and will accept comments through Feb. 4 ...

Ecology is considering amendments to Chapter 173-423 WAC, Washington’s Clean Vehicles Program rule. Washington law (RCW 70A.30.010) requires Ecology to adopt certain California regulations to maintain ...

In 2024, litter-pickup programs we funded collected more than 5.2 million pounds (2,632 tons) of litter and cleaned more than 18,000 miles of road, statewide. See how much litter crews picked up in ...

On June 30, 2025, we released final programmatic environmental impact statements for three types of clean energy facilities in Washington -- utility-scale onshore wind, solar and green hydrogen ...

Producers of residential packaging and paper products will be responsible for the end-of-life management of their products. Using funds provided by producers, the PRO will invest in recycling system ...

We provide millions of dollars of funding to improve, protect, and restore water quality across the state. We have several opportunities that vary by funding source, funding category, and type of ...

This permit outlines uniform conditions and treatment, discharge, and disposal methods for fresh fruit packing wastewater based on the similarities of wastewater characteristics among facilities. The ...