Regulations & Permits

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

We oversee many state and federal laws designed to protect Washington's land, air, and water. See our laws, rules, & rulemaking page for more information about our current rules and rulemaking.

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Sabey Intergate Data Center - Revised Health Impact Assessment

Revised Health Impact Assessment for Sabey Intergate Data Center, 11/16/15

https://ecology.wa.gov/revhistmt

Vantage Data Center - Health Impact Assessment Recommendation

Health Impact Assessment (Second Tier Review) Recommendation for Vantage Data Center, 5/11/17

https://ecology.wa.gov/vantage-hiarec-051117ada

Yahoo Data Center - Notice of Construction permit and technical support document

Notice of Construction permit and Technical Support Document for Yahoo Data Center, 5/25/16

https://ecology.wa.gov/yahoo16aq-e012

Yahoo Data Center - Technical Support Document for Notice of Construction permit

Technical Support Document for Notice of Construction permit for Yahoo Data Center, 5/25/16

https://ecology.wa.gov/yahootsd16aqe12amd1

Vantage Data Center - Health Impact Assessment letter

Health Impact Assessment (Second Tier Review) Letter for Vantage Data Center, 5/11/17

https://ecology.wa.gov/vantage-tier2ltr-final-051117ada

Sabey Intergate Data Center - Draft Notice of Construction Technical Support Document

Draft Notice of Construction Technical Support Document for Sabey Intergate Data Center, 11/16/15

https://ecology.wa.gov/tsd111615

CyrusOne Data Center Second-Tier Health Impact Assessment

This is the second-tier health impact assessment report prepared by Landau Associates for CyrusOne Data Center.

https://ecology.wa.gov/20181226cyrusonehialandau

Microsoft MWH Data Center Expansion Tier 2 letter

This is the Microsoft MWH Data Center expansion Tier 2 toxics review letter.

https://ecology.wa.gov/20180717tier2ltr

Microsoft MWH Data Center Expansion HIA Recommendation

This is the Microsoft MWH Data Center expansion Health Impact Assessment recommendation document.

https://ecology.wa.gov/201807mwh_hiarecomm

Sabey Intergate Data Center - Appendix E of Notice of Construction permit

Appendix E of Notice of Construction application for Sabey Intergate Data Center, 6/4/15

https://ecology.wa.gov/appxe

Vantage Data Center - Revised Health Impact Assessment response

Revised Health Impact Assessment (Second Tier Review) response for Vantage Data Center, 11/16/16

https://ecology.wa.gov/vantage-revfinal-2ndtier-ra-111616ada

Yahoo Data Center - Health Impact Assessment letter

Health Impact Assessment (Second Tier Review) Letter for Yahoo Data Center, 2/17/16

https://ecology.wa.gov/yahoogenesistier2ltr02172016

Yahoo Data Center - Health Impact Assessment

Health Impact Assessment (Second Tier Review) for Yahoo Data Center, 2/17/16

https://ecology.wa.gov/yahoogenesishis02172016

Vantage Data Center - Notice of Construction application

Notice of Construction application for Vantage Data Center, 8/10/16

https://ecology.wa.gov/vantage-noc-app-supprpt-081016ada

Sabey Intergate Data Center - Request for revisions for Notice of Construction permit

Request for revisions to Notice of Construction permit for Sabey Intergate Data Center, 3/4/15

https://ecology.wa.gov/revrequestao030415

Microsoft Columbia Data Center - Notice of Construction permit

Notice of Construction permit for Microsoft Columbia Data Center, 10/26/10

https://ecology.wa.gov/msn-order10aq-e374

Microsoft MWH Data Center Expansion PD

This is the Microsoft MWH Data Center expansion preliminary determination.

https://ecology.wa.gov/20180607mwh_pd2

Microsoft MWH Data Center 2nd Tier HIA

This is the 2nd Tier Health Impact Assessment for the Microsoft Data Center expansion in Quincy.

https://ecology.wa.gov/20180606mwh_hia

Microsoft Columbia Data Center - Technical Support Document for Health Impact Assessment

Technical Support Document for the Health Impact Assessment (Third Tier Review) for Microsoft Columbia Data Center, 8/20/10

https://ecology.wa.gov/ms-tier3-doc

Sabey Intergate Data Center - Updated Health Impact Assessment

Updated Health Impact Assessment (Second Tier Review) Recommendation for Sabey Intergate Data Center, 3/3/15

https://ecology.wa.gov/updaterpt2ndtier