Started in February 2023, we hold quarterly auctions where businesses and individuals participating in Washington's cap-and-invest program can buy emissions allowances. To participate in these ...

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 ...

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

Channel migration zones are areas in a floodplain where a stream or river channel can be expected to move naturally over time in response to gravity and topography. Water bodies such as rivers and ...

A 2016 Washington State Supreme Court decision changed how counties decide to approve or deny building permits that use wells for a water source. In the Whatcom County vs. Hirst, Futurewise, et al.

The background section of the SEPA environmental checklist helps applicants, agencies, and reviewers fully understand all aspects of a proposal, including related activities. Lead agencies use this ...

The Washington state well report (log) viewer, our most popular online resource, allows you to search for and view detailed records of the construction and subsurface characteristics of individual ...

We are required by law to collect fees from permit holders who have wastewater or stormwater discharge permits (RCW 90.48.465) to recover our cost of administering the permits. Every two years we use ...

We're working to reduce polluted runoff from streets, forests, and farms. When it rains, water flows across the land, streets, and sidewalks. Pollutants are carried by this water into local streams, ...

Businesses that generate any amount of dangerous waste are responsible for this waste from cradle to grave. In Washington state, the Dangerous Waste Regulations determine what dangerous waste is, and ...

Find a household hazardous waste disposal site in your county. Accepts: Household hazardous waste. Does not accept wastes from business unless it is a scheduled small business collection event. Check ...

We and local clean air agencies monitor and track emissions to make sure levels of outdoor air pollutants meet federal and state air quality standards. We focus on EPA's "criteria" pollutants and ...