Research & Data

Use this portal to filter and search for all of our scientific information.

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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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Research & Data

Use this portal to filter and search for all of our scientific information.

Research & Data icon

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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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
Effectiveness monitoring for water quality
Our scientists study the effectiveness of projects to protect and improve water quality.
https://ecology.wa.gov/research-data/monitoring-assessment/water-quality-improvement-effectiveness-monitoring
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
Lower Snohomish River Tributaries effectiveness monitoring
We're studying bacteria pollution in tributaries to the Lower Snohomish River.
https://ecology.wa.gov/research-data/monitoring-assessment/water-quality-improvement-effectiveness-monitoring/lower-snohomish-river-tributaries
Measuring bluff erosion in ​Clallam County
​We collected scientific data about bluff-backed Dungeness and Elwha beaches and spits to measure erosion.
https://ecology.wa.gov/research-data/monitoring-assessment/coastal-monitoring-assessment/projects/clallam-county-bluffs
Puget Sound feeder bluffs
Protecting the cliffs that feed Puget Sound beaches with sand and the beaches that depend on them.
https://ecology.wa.gov/research-data/monitoring-assessment/coastal-monitoring-assessment/projects/puget-sound-feeder-bluff
​Shoalwater Bay berm monitoring
We monitored the Willapa Bay shoreline to assess how a flood-protection berm changed over time.
https://ecology.wa.gov/research-data/monitoring-assessment/coastal-monitoring-assessment/projects/shoalwater-bay-berm-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
Washington 2018 Greenhouse Gas Contributors by Percent
Pie chart showing 2018 Washington greenhouse gas contributors by percent
https://ecology.wa.gov/20201228-ghgpiechart-2018-alt
Tracking Washington Greenhouse Gases
Chart showing past emissions and future greenhouse gas limits set by the Legislature.
https://ecology.wa.gov/20201221-ghg-actual-projections_alt
Washington Total Annual Emissions
bar chart shoring Washington greenhouse gases the past decade
https://ecology.wa.gov/2011-2018_ghg-barchart-alt
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