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.
Ecology/Commerce Watershed Protection & Restoration Proposal
Six-year work plan for restoring and protecting watersheds in the Puget Sound region (2011-2017).
https://ecology.wa.gov/ecology-commerce-watershed-protection-restoratio
EPA Davis-Bacon Act Memo November 30, 2009
Application of Davis-Bacon Act Wage Requirements to Fiscal Year 2010 Clean Water State Revolving Fund and Drinking Water State Revolving Fund Assistance Agreements
https://ecology.wa.gov/epa-davis-bacon-act-memo-november-30-2009
EcologyCommentsEPA082819
This is a copy of the testimony that Heather Bartlett gave during the EPA online hearing held Aug. 28, 2019
https://ecology.wa.gov/ecologycommentsepa082819
Eastern WA O&M Worksheet
Use this worksheet as a guide for interviewing MS4 staff and reviewing applicable documents.
https://ecology.wa.gov/eastern-wa-o-m-worksheet
LID Briefings for Elected Officials - Eastern Washington Presentation
This is a briefing about Low Impact Development requirements of municipal stormwater permittees for elected officials in Eastern Washington.
https://ecology.wa.gov/electedbriefingsewapresentation
LID Briefings for Elected Officials - Western Washington Presentation
This is a briefing about Low Impact Development requirements of municipal stormwater permittees for elected officials in Western Washington.
https://ecology.wa.gov/electedbriefingswwapresentation
AO16-07 EPA Approval Letter
This is the letter from the EPA that states that the changes still follow the Clean Water Act and are approved.
https://ecology.wa.gov/epa-approval-letter
AO16-07 EPA Approval Tech Support Doc
This is the technical support document that goes with the EPA Approval Letter.
https://ecology.wa.gov/epa-approval-tech-support-doc
Ecology Water Quality Combined Fiscal Year 2019 Applicant Workshop Guidance for Recipient Files
Ecology Water Quality Combined Fiscal Year 2019 Applicant Workshop Guidance for Recipient Files
https://ecology.wa.gov/ecology-water-quality-combined-fiscal-year-2019-ap
Ecology Water Quality Funded Facility Projects EPA Signage Memo
Ecology Water Quality Funded Facility Projects EPA Signage Memo
https://ecology.wa.gov/epa-signage-memo-for-cwsrf-funded-projects
Adsorb-it filtration fabric
Ecology letter finding Eco-Tec, Inc. Adsorb-it filtration fabric, when configured properly, can be used as a catch basin insert for stormwater control.
https://ecology.wa.gov/ecologyletter
Envirotac II
Letter showing Envirotac II functionally equivalent to C126 (Polyacrylamide for Soil Erosion Protection) and C140 (Dust Control) best management practices for stormwater management.
https://ecology.wa.gov/envirotac2
EarthGuard Fiber Matrix Equivalency
Ecology letter finding EarthGuard Fiber Matrix can be used as temporary erosion control mechanism.
https://ecology.wa.gov/equivalency-earthguard-bmpc120
Detalok Equivalency Letter
Letter showing Deltalok product can be used to meet Element 6 (Protect Slopes) of the Stormwater Pollution Prevention Plan for construction sites.
https://ecology.wa.gov/equivalencyletter
Ecology's Submittal Letter to EPA (WAC 173-201A) 8/01/16
This is the Ecology's Submittal Letter to EPA for WAC 173-201A Water quality standards for surface waters of the state of Washington.
https://ecology.wa.gov/ecology-s-submittal-letter-to-epa-wac-173-201a-8
Erosian Eel
Letter stating that Erosion EEL is equivalent to straw wattle for use in stormwater control.
https://ecology.wa.gov/erosioneel
Ecology EPA response July 11 2022
Ecology's July 11, 2022 response to EPA on Lower Yakima Valley GWMA work
https://ecology.wa.gov/ecology-epa-letter-071122
EPA letter to Washington Agencies Lower Yakima Valley
EPA letter to Washington state agencies on Lower Yakima Valley
https://ecology.wa.gov/epa-letter-to-washington-agencies-2022
Errata for Draft Permits
Errata sheet for discrepencies between the blackline and redline versions of the formal draft 2019 Municipal Stormwater Permits
https://ecology.wa.gov/errata-for-redline-versions-of-the-formal-drafts
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