Research & Data
Use this portal to filter and search for all of our scientific information.
Ecology provides the high-quality science that is the foundation of Washington state environmental policy. Our monitoring, assessment, and modeling services provide a data-rich understanding of our state’s land, air, and water. We provide access to that data through reports, databases, maps and user-friendly online tools.
5-7-19DirectorBellonLettertoEPA
This letter expresses Ecology's concern over reconsidering Washington State's Water Quality Standards for Human Health Criteria
https://ecology.wa.gov/5-7-19directorbellonlettertoepa
Public review draft - Policy 1-11 Chapter 1 non-substantial updates
Draft shows revisions with track changes. Public comment period November 2022 through Jan. 6, 2023. One of 2 documents with draft revisions.
https://ecology.wa.gov/2022-policy-1-11-chapter-1-non-substantial-updates
Summarization notes Category 4B (Other Pollution Control Program) for PCB impaired waters
Follow up from March 30, 2017 Meeting discussing implementation of Human Health Criteria in the Water Quality Assessment Policy 1-11
https://ecology.wa.gov/4bpcbfinal
Ecology Water Quality Funded Activities Projects Final Report template
Ecology Water Quality Funded Activities Projects Final Report template
https://ecology.wa.gov/activities-projects-final-report-template
Addendum to Informal Draft Language
This addendum goes with the draft rule language for the informal comment period.
https://ecology.wa.gov/addendum-to-informal-draft-language
Uplet Outlet Ecology Approval Letter
This document explains 2gH Solutions Uplet Outlet is not approved by Ecology, however it is allowed to be installed with stipulations.
https://ecology.wa.gov/2gh-uplet-outlet-approval-letter
401 Certification - Wynoochee
The 401 certification document for Wynoochee
https://ecology.wa.gov/401-certification-wynoochee
Adopted rule language (WAC 173-201A) 09/17/21
This is adopted rule language for WAC 173-201A Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/adopted-rule-language-wac-173-201a-09-17-21
Adopted rule language (WAC 173-201A) 03/22/22
This is adopted rule language for WAC 173-201A Water Quality Standards
https://ecology.wa.gov/adopted-rule-language-wac-173-201a-03-22-22
ACF wheel washing
Letter showing ACF wheel washing functional equivalence.
https://ecology.wa.gov/acfwestwheelwashfeaenclosure
APAM Shoreline template.
Template used to show when herbicides will be applied.
https://ecology.wa.gov/2apamshoreline
Shoreline Posting Template for Noxious Weeds
Post this sign when treating for noxious weeds.
https://ecology.wa.gov/2shorelinepostingtemplatesnoxweed
Shoreline Posting Template for Noxious Weeds in Spanish
Use these Spanish signs when treating for noxious weeds.
https://ecology.wa.gov/2shorelinepostingtemplatesnoxweed_spanish
Adopted rule language (WAC 173-201A) 08/01/16
This is adopted rule language for WAC 173-201A Water quality standards for surface waters of the state of Washington.
https://ecology.wa.gov/adopted-rule-language-wac-173-201a-08-01-16
Stormwater Control Transfer Program second draft comments
Ecology is issuing this second draft guidance in concert with a companion draft guidance, Building Cities in the Rain, being issued by the Department of Commerce
https://ecology.wa.gov/2nd-draft-comments
Appendix A: Response to Comments for Permit Effective August 1, 2013 (August 1, 2012) Part IV Addendum
Addendum to Part IV - Response to Comments on the Phase I Annual Report Questions for Cities and Counties
https://ecology.wa.gov/addendumtophaseivrtc
Adopted rule language (WAC 173-201A) 08/14/24
This is adopted rule language for WAC 173-201 Water Quality Standards for Surface Waters of the State of Washington
https://ecology.wa.gov/adopted-rule-language-wac-173-201a-08-14-24
ACO StormBrixx approval letter
ACO StormBrixx Geocellular system is approved for stormwater detention storage.
https://ecology.wa.gov/aco-stormbrixx-approval-letter
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