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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pH benchsheet

is a quality-control tool for environmental laboratories.

https://ecology.wa.gov/ph-benchsheet

Petition Response General Permit Small Mining Jan 19 2018

Response letter to petition for general permit for small scale mining

https://ecology.wa.gov/petition-response-general-permit-for-small-mining

Permit Denial Millennium Bulk Terminals

A water certification denial detailing the reasons why the Washington Department of Ecology made its decision.

https://ecology.wa.gov/permit-denial-millennium-bulk-terminals

Upland fin-fish hatching and rearing general permit

This is the 2015 general permit issued for upland fin-fish hatching and rearing. It is a National Pollutant Discharge Elimination System (NPDES) and State Waste Discharge General Permit effective from April 1, 2016 until March 31, 2021.

https://ecology.wa.gov/permitfinal12152015

Coverage and Exemptions S1.A

This section describes the specific activities that require coverge and the exemptions.

https://ecology.wa.gov/permit-section-s1-a

Overview of key decisions in rule amendments (WAC 173-201A) 9/30/14

This is the overview of key decisions in rule amendments for human health criteria and implementation tools for WAC 173-201A Water quality standards for surface waters of the state of Washington.

https://ecology.wa.gov/overview-of-key-decisions-in-rule-amendments-wac

Ecology Water Quality Funded Facility Projects Investment Grade Efficiency Audit (IGEA) Requirements

https://ecology.wa.gov/overview-of-igea-requirements

Permeable Pavement Inspection Form

Low Impact Development guidance - Permeable Pavement Inspection Form

https://ecology.wa.gov/permeablepavementinspectionform

Perry Pallet Functional Equivalent

Ecology finds Perry Pallet Mulch functionally equivalent to BMP C121 Mulching and BMP C235 Wattles.

https://ecology.wa.gov/perry-pallet

permitcoverages

This is a list of permitees and applicator coverages for the aquatic plant

https://ecology.wa.gov/permitcoverages

Part I - Introduction and Response to Comments on more than one permit

Western Washington Phase II Municipal Stormwater Permit 2012 Response to comments for permit effective Aug. 1, 2013 Part I

https://ecology.wa.gov/part1

Part III – Response to Comments on WWA Phase II Permit

Western Washington Phase II Municipal Stormwater Permit 2012 Response to comments for permit effective Aug. 1, 2013 Part III

https://ecology.wa.gov/part3

Part V – Response to Comments on Western Washington Appendix I and Low Impact Development

Western Washington Phase II Municipal Stormwater Permit 2012 Response to comments for permit effective Aug. 1, 2013 Part V

https://ecology.wa.gov/part5

Eastern Washington Phase II Municipal Stormwater Permit Response to Comments for Permit Effective August 1, 2014 (August 1, 2012)

Part I - Introduction and Response to Comments on More Than One Permit

https://ecology.wa.gov/part1-71caaf95f68adb3536079b0c62e89a8d

Eastern Washington Phase II Municipal Stormwater Permit Response to Comments for Permit Effective August 1, 2014 (August 1, 2012) Part II

Part II - Response to Comments on EWA Phase II Permit

https://ecology.wa.gov/part2

Dismissal Order for CSWGP

March 27, 2017 Dismissal Order

https://ecology.wa.gov/pchbdismissal3-27-17

Appendix A: Response to Comments for Permit Effective August 1, 2013 (August 1, 2012) Part I

Part I - Introduction and Response to Comments on More than One Permit

https://ecology.wa.gov/part1-3b72a867300755e82388fdefa5b933c7

Sand & Gravel General permit permit reference index

Use this index to compare permit references between the 2011 and 2016 Sand & Gravel General Permits. (Note: this index does not indicate changes in permit langugae -- many sections in the permit were renumbered without a change in permit language.)

https://ecology.wa.gov/permitreferenceindex

Appendix A: Response to Comments for Permit Effective August 1, 2013 (August 1, 2012) Part IV

Part IV - Response to Comments on the Phase I Permit

https://ecology.wa.gov/part4

Appendix A: Response to Comments for Permit Effective August 1, 2013 (August 1, 2012) Part V

Part V - Response to Comments on Western Washington Appendix I and Low Impact Development

https://ecology.wa.gov/part5-a34b5a3f5e2b9412ddd4eeb493f1d99a