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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Estimaging Load Reductions using STEPL

Spreadsheet tool for the estimation of pollutant load

https://ecology.wa.gov/estimaging-load-reductions-using-stepl

Error Analysis for Water Quality Policy 1-11: Pertaining to the Water Quality Assessment December 2016

Water Quality Policy 1-11 is the policy that guides listing decisions for Washington’s Water Quality Assessment to meet Clean Water Act requirements for sections 303(d) and 305(b). During updates to Policy 1-11 in 2012, several comments were received about the risk of listing errors for waters that were placed on the 303(d) list based on limited data.

https://ecology.wa.gov/erroranalysispolicy1-11

ERO-EYC teacher reference form

Reference form for EYC ERO

https://ecology.wa.gov/ero-eyc-teacher-reference-form

ERTV analysis - response to public comments

Response to public comments for ERTV analysis

https://ecology.wa.gov/ertv-analysis-response-to-public-comments

ERTV analysis scope of work

Scope of work for ERTV analysis

https://ecology.wa.gov/ertv-analysis-scope-of-work

ERO Youth Application

An application for a crew member position for the Ecology Youth Corps' 2022 summer youth crews.

https://ecology.wa.gov/ero-youth-application

Errata for general permit

This document describes the errors and their corrections found in the fin-fish hatching and rearing permit

https://ecology.wa.gov/errata-for-general-permit

Evaporation calculation spreadsheet

Evaporation calculation spreadsheet for Eastern WA Stormwater Management Manual

https://ecology.wa.gov/evaporativepondspreadsheet

Establishing small quantity emission rates (WAC 173-460) 01/16/19

This document discusses establishing small quantity emission rates in Chapter 173-460 WAC.

https://ecology.wa.gov/2019-wac406-establishingsmallquantityemissionrates

Evaluating if SQER and de minimis values should be the same (WAC 173-460) 01/17/19

This document evaluates if SQER and de minimis values should be the same in Chapter 173-460 WAC.

https://ecology.wa.gov/20190117-sqeranddeminimisvaluesshouldbethesame

Erosian Eel

Letter stating that Erosion EEL is equivalent to straw wattle for use in stormwater control.

https://ecology.wa.gov/erosioneel

Aquatic Noxious Weed Control NPDES General Permit Errata

Corrections and Clarifications for the Aquatic Noxious Weed Control NPDES General Permit.

https://ecology.wa.gov/erratanoxiousweedpermit

Errata for 2013-2018 Western Washington Municipal Stormwater Permits

Clarifications and corrections to Western Washington Phase II Municipal Stormwater Permit

https://ecology.wa.gov/errata2015-02

Electronics Recyclers International Audit Report

This document includes information about direct processor, Electronics Recyclers International, and includes their annual environmental audit report. This audit verifies compliance with the performance standards for direct processors in the E-Cycle WA program.

https://ecology.wa.gov/eriauditsummary2016

Zostera japonica Management General Permit Errata and fact sheet addendum

Corrections and Clarifications on the Zostera japonica Management General Permit.

https://ecology.wa.gov/erratazjfactsheetaddendum

Effectiveness study groundwork

https://ecology.wa.gov/es_groundwork

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

Phase I Municipal Stormwater Permit Errata

Errata issued February 2015

https://ecology.wa.gov/errata2015-02-939c377a6ff974c6559b9b0b9a3128b5

Everett Approved SMP July 2016

Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology

https://ecology.wa.gov/everett-approved-smp-july-2016

Everson Approved SMP October 2017

Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology

https://ecology.wa.gov/everson-approved-smp-october-2017