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.

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Process design

Process design - voluntary clean water guidance for agricultural activities

https://ecology.wa.gov/process-design

Policy 1-11 Easy-To-Read Bacteria Criteria Revisions

Easy to read version of water quality Policy 1-11 proposed bacteria criteria revisions for public comment

https://ecology.wa.gov/policy-1-11-draft-bacteria-criteria-revisions

Policy 1-11 Summary of Proposed Revisions

This is a summary of proposed revisions for the water quality assessment listing Policy 1-11

https://ecology.wa.gov/policy-1-11-summary-of-proposed-revisions

Policy 1-11 Scoping Comments Summary June 2016

Summary scoping comments on the Policy 1-11, June 2016

https://ecology.wa.gov/policy1-11-scopingcommentssummary

Preliminary Draft EIS (WAC 173-201A) 06/10/20

Preliminary Draft EIS for PCB Variances on the Spokane River. Chapter 173-201A WAC.

https://ecology.wa.gov/preliminary-draft-eis-wac-173-201a-06-10-20

Preliminary Draft Implementation Plan (WAC 173-201A) 06/10/20

Preliminary Draft Implementation Plan for PCB Variances on the Spokane River. Chapter 173-201A WAC.

https://ecology.wa.gov/preliminary-draft-implementation-plan-wac-173-201

Previous Water Treatment Plant General Permit 2009

This is the previous Water Treatment Plant General Permit from 2009.

https://ecology.wa.gov/previous-water-treatment-plant-general-permit-2009

Previous Water Treatment Plant General Permit Fact Sheet 2009

This is the previous Water Treatment Plant General Permit fact sheet from 2009.

https://ecology.wa.gov/previous-water-treatment-plant-general-permit-2014

Pilot Use Level Technologies Notice of Intent (application) form

Local governments with a National Pollutant Discharge Elimination System (NPDES) permit must submit this Notice of Intent Form to Ecology, and receive Ecology’s approval prior to installing a pilot-designated technology (except in retrofit situations).

https://ecology.wa.gov/puldnoi

Preliminary Draft Rule Language (WAC 173-201A) 06/10/20

Preliminary draft rule language for amendments to chapter 173-201A WAC, for PCB Variances on the Spokane River.

https://ecology.wa.gov/preliminary-draft-rule-language-wac-173-201a-06

Preliminary Draft State Technical Support Document (WAC 173-201A) 06/10/20

This preliminary draft document provides background and technical information for PCB Variances on the Spokane River. Chapter 173-201A WAC.

https://ecology.wa.gov/preliminary-draft-state-technical-support-document

Preliminary draft toxics language and toxics table (WAC 173-201A) 9/30/14

This is the Preliminary draft toxics language and toxics table with footnotes at WAC 173-201A-240 for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-toxics-language-and-toxics-table

Preliminary draft SBEIS (WAC 173-201A) 9/30/14

This is the preliminary draft small business economic impact statement for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-sbeis-wac-173-201a-9-30-14

Preliminary draft rule language for implementation (WAC 173-201A) 9/30/14

This is the preliminary draft rule language for implementation tools at WAC 173-020, 420, 460, and 510(4) for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-rule-language-for-implementation

Preliminary draft Implementation Plan (WAC 173-201A) 9/30/14

This is the preliminary draft Implementation Plan to implement rule after it is adopted for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-implementation-plan-wac-173-201a-9-30-14

Preliminary draft CBA and LBA (WAC 173-201A) 9/30/14

This is the preliminary draft cost benefit and least burdensome alternative analyses for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/preliminary-draft-cba-and-lba-wac-173-201a-9-30

Eastern WA Workshop and Hearing Presentation

Presentation slides for the workshop on the formal draft Eastern WA Phase II Municipal Stormwater General Permit

https://ecology.wa.gov/presentation-slides-for-eastern-wa

Sand & Gravel General permit preliminary draft language

This is the preliminary draft language for the 2016-2021 Sand & Gravel general permit.

https://ecology.wa.gov/preliminarydraft

Formal draft Western WA permits workshops and public hearings presentation

Presentation slides for the workshop on the formal draft Western Washington Municipal Stormwater general permits

https://ecology.wa.gov/presentation-slides-for-western-wa

Prelimary Draft Sand and Gravel

Draft language for the for Sand and Gravel Permit. Includees Process Water, Stormwater, and Mine Dewatering Water Discharges Associated with Sand and Gravel Operations, Rock Quarries, and Similar Mining Facilities, Including Stockpiles of Mined Materials, Concrete Batch Operations and Hot Mix Asphalt Operations.

https://ecology.wa.gov/preliminarydraft-1