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.
Air Quality Index (AQI)
The Air Quality Index (AQI) tells you when air quality is healthy or unhealthy.
https://ecology.wa.gov/research-data/monitoring-assessment/air-quality-index
River and stream flow monitoring
We report the amount of water flowing through Washington’s rivers and streams using graphs and maps.
https://ecology.wa.gov/research-data/monitoring-assessment/river-stream-monitoring/flow-monitoring
Sprague Lake Community Mtg
Sprague Lake Hydrology Analysis Community Kick-Off Meeting November 22, 2022
https://ecology.wa.gov/sprague-lake
Air Quality data for Intalco Storymap
A table showing the number of days in each Air Quality Index category near Intalco
https://ecology.wa.gov/20200414-intalcostorymap
2019 Ambient Air Monitoring Network Plan
This report describes Washington's air monitoring network and how Ecology will operate its air quality monitoring stations in the next year.
https://ecology.wa.gov/20190515airmonitoringnetworkplan
Verification of Continued Attainment in Limited Maintenance Areas
This document summarizes the calculations for verification of continued attainment of National Ambient Air Quality Standards (NAAQS) in Washington's Limited Maintenance Areas.
https://ecology.wa.gov/20190515verification
Frequently Asked Questions: Policy 1-11 Bacteria Criteria Revision
Frequently asked questions about the bacteria criteria revisions to water quality Policy 1-11
https://ecology.wa.gov/frequently-asked-questions-policy-1-11-bacteria-cr
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
EPA approval letter
Approval of Washington’s 2014-2018 Section 303(d) List
https://ecology.wa.gov/20220826-final-wa-2014-2018-303dlist-transmittal
Public review draft - Policy 1-11 Chapter 1 Harmful Algae Blooms Methodology
Draft shows proposed revisions. Public comment period November 2022 through Jan. 6, 2023. One of 2 documents with draft revisions.
https://ecology.wa.gov/2022-policy-1-11-chapter-1-hab-methodology-draft-r
Public review draft - Policy 1-11 Chapter 1 non-substantial updates
Draft shows revisions with track changes. Public comment period November 2022 through Jan. 6, 2023. One of 2 documents with draft revisions.
https://ecology.wa.gov/2022-policy-1-11-chapter-1-non-substantial-updates
Ecology comments to EPA on proposed ozone NAAQS standard
Comments submitted to EPA on the agency's proposed ozone standards.
https://ecology.wa.gov/20200929-ecology-ozone-naaqs-comments
MNA Plain Text
Monitored natural attenuation (MNA) process at the Boeing Auburn site
https://ecology.wa.gov/mna-plaintext
Ecology Water Quality Funded Aquatic Invasive Plants Grant Project Offer List for Fiscal Year 2020
List of applicants who were offered grants/loan through Ecology's Water Quality Funded Aquatic Invasive Plants Grant Project for Fiscal Year 2020
https://ecology.wa.gov/fy2020-aquatic-invasive-plant
Soos Creek SAP Appendix 1: 7-DADMAX thermal record graphs
7-DADMAX thermal record graphs for Soos Creek Watershed Temperature and DO TMDL Study and Analysis Plan, Appendix 1
https://ecology.wa.gov/soos-creek-sap-appendix-1-7-dadmax-thermal-record
Ecology Water Quality Funded Aquatic Invasive Plants Grant Project Offer List for Fiscal Year 2021
List of applicants who were offered grants/loan through Ecology's Water Quality Funded Aquatic Invasive Plants Grant Project for Fiscal Year 2021
https://ecology.wa.gov/fy2021-aquatic-invasive-plant-grants-offer-list
Clean Watershed Needs Survey - Calendar year 2018 Overview
This document provides an overview of the calendar year 2018 cycle of the Clean Watershed Needs Survey process for reviewing state watersheds to make a list of their water issues and needs
https://ecology.wa.gov/cwns-cy2018-overview
Soos Creek SAP Appendix 2: Historical dissolved oxygen data
Historical dissolved oxygen data
https://ecology.wa.gov/soos-creek-sap-appendix-2-historical-dissolved-ox
Soos Creek SAP Appendix 3: Discharge, water temperature, air temperature graphs
Discharge, water temperature, air temperature graphs
https://ecology.wa.gov/soos-creek-sap-appendix-3-discharge-water-temper
Water Quality Fiscal Year 2013 - 2015 Biennium Outcomes Report
2 year report on Water Quality projects funded by Ecology, covering Fiscal Years 2013 through 2015
https://ecology.wa.gov/fiscal-year-2013-2015-biennium-outcomes-report-f
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