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.
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
Webinar Agenda July 10 2018
Agenda for the July 10, 2018 Manual Update Webinar
https://ecology.wa.gov/e-wa-manual-public-meeting-agenda-7-10-18
Richland Public Meeting Handout 1
Presentation slides handout at Richland Public Meeting
https://ecology.wa.gov/e-wa-richland-public-meeting-handout-1
Richland Public Meeting Handout 2
Summary of changes handout for Richland Public Meeting
https://ecology.wa.gov/e-wa-richland-public-meeting-handout-2
Richland Public Meeting Agenda
Public Meeting Agenda for Stormwater Manual Update
https://ecology.wa.gov/ewa-manual-public-meeting-agenda-6-26-18
Ecology Water Quality Funded Activity Projects - Example Land Owner Agreement
Ecology Water Quality Funded Activity Projects - An example of a Land Owner Agreement that would be submitted to Ecology supporting a funded project and its work.
https://ecology.wa.gov/example-land-owner-agreement-for-cent-and-section
Richland Public Meeting Parking Map
Map of parking area for public meeting
https://ecology.wa.gov/ewa-manual-public-meeting-parking-map
Eastern WA Manual Update Spring Newsletter
Spring 2018 Newsletter on the EWA Manual Update
https://ecology.wa.gov/ewa-manual-spring-newsletter
Webinar Presentation July 10 2018
Presentation slides for July 10, 2018 Webinar
https://ecology.wa.gov/ewa-public-meeting-webinar-slides-7-10-18
Summary of Changes
Summary of Changes to the 2018 EWA Stormwater Manual
https://ecology.wa.gov/ewa-webinar-summary-of-changes-7-10-18
Level One Response Form Example
Example of a Completed Level One Response Form for Boatyard general permit
https://ecology.wa.gov/example-leveloneresponse-20160707
Evaporation calculation spreadsheet
Evaporation calculation spreadsheet for Eastern WA Stormwater Management Manual
https://ecology.wa.gov/evaporativepondspreadsheet
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
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
Eastern Washington Phase II Municipal Stormwater Permit Fact Sheet
Fact Sheet for October 2011 Draft Permit (November 2011)
https://ecology.wa.gov/ewaphaseiifactsheet
Permit Timelines Overview
Eastern Washington Phase II Permit Timelines Overview (2014-2019)
https://ecology.wa.gov/ewaphaseiimunipermitoverviewfinal-02-19-2013
Eastern Washington Phase II Municipal Stormwater Permit
Current permit, effective 2014-2019
https://ecology.wa.gov/ewaphaseiipermit2014
Phase I Municipal Stormwater Permit Errata
Errata issued February 2015
https://ecology.wa.gov/errata2015-02-939c377a6ff974c6559b9b0b9a3128b5
1089 results
381 - 400 of 1089