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.
Centroid calculator
An Excel/VBA program to calculate the centroid of a time-concentration series or any x-y series of data.
https://ecology.wa.gov/xlsm-centroid-calculator
Yard care fact sheet E WA
Washington Waters Ours to Protect yard care fact sheet E WA
https://ecology.wa.gov/yard-care-fact-sheet-e-wa
Yard care fact sheet W WA English
Washington Waters Ours to Protect yard care fact sheet W WA English
https://ecology.wa.gov/yard-care-fact-sheet-w-wa-english
Yard care fact sheet W WA Spanish
Washington Waters Ours to Protect yard care fact sheet W WA Spanish
https://ecology.wa.gov/yard-care-fact-sheet-w-wa-spanish
Yard care poster E WA
Washington Waters Ours to Protect yard care poster E WA
https://ecology.wa.gov/yard-care-poster-e-wa
Yard care poster W WA English
Washington Waters Ours to Protect yard care poster W WA English
https://ecology.wa.gov/yard-care-poster-w-wa-english
Yard care poster W WA Spanish
Washington Waters Ours to Protect yard care poster W WA Spanish
https://ecology.wa.gov/yard-care-poster-w-wa-spanish
Western Washington Phase II Municipal Stormwater Permit Appendix 3
Appendix 3. Annual Report Questions for Cities, Towns and Counties
https://ecology.wa.gov/wwaphaseii-app3
Western Washington Phase II Municipal Stormwater Permit Appendix 4
Appendix 4. Annual Report Questions for Secondary Permittees
https://ecology.wa.gov/wwaphaseii-app4
Western Washington Phase II Municipal Stormwater Permit Appendix 5
Appendix 5. Notice of Intent for Coverage
https://ecology.wa.gov/wwaphaseii-app5
Western Washington Phase II Municipal Stormwater Permit Appendix 6
Appendix 6. Street Waste Disposal
https://ecology.wa.gov/wwaphaseii-app6
Western Washington Phase II Municipal Stormwater Permit Appendix 7
Appendix 7. Determining Construction Site Sediment Damage Potential
https://ecology.wa.gov/wwaphaseii-app7
Western Washington Phase II Municipal Stormwater Permit Appendix 8
Appendix 8. Annual Report Questions for New Permittees
https://ecology.wa.gov/wwaphaseii-app8
Western Washington Phase II Municipal Stormwater Permit Appendix 9
Appendix 9. Stormwater Discharge Monitoring
https://ecology.wa.gov/wwaphaseii-app9
November 11, 2011 Fact sheet
Western Washington Phase II Municipal Stormwater Permit November 11, 2011 Fact sheet
https://ecology.wa.gov/wwaphaseiifactsheetfinal
Western Washington Phase II Municipal Stormwater Permit
Current permit, effective 2013-2018, modified in 2014
https://ecology.wa.gov/wwaphaseii-permit-2014final
Yakima Approved SMP October 2014
Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology
https://ecology.wa.gov/yakima-approved-smp-october-2014
Yakima County Approved Regional SMP February 2010
Shoreline Master Program that has been adopted by the local jurisdiction and Approved by Ecology
https://ecology.wa.gov/yakima-county-approved-regional-smp-february-2010
Wastewater Treatment Plant Award Recipients
Current Year Wastewater Treatment Plant Award Recipients
https://ecology.wa.gov/wwtp-award-list
Yakima 2025 Application Summary
Yakima application summary 2025
https://ecology.wa.gov/yakima-2025-application-summary-5abbb11ee54ef7a30843255f1a7c08ff
4470 results
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