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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Air quality

Yakima Air Wintertime Nitrate Study

A study about high nitrate levels in Yakima's winter air.

https://ecology.wa.gov/yakimaairwinterstudyreport

Washington Emissions Inventory Reporting System (WEIRS) Add New Emissions form

form to add new emissions in Washington Emissions Inventory Reporting System (WEIRS)

https://ecology.wa.gov/addnewemissions

Washington Emissions Inventory Reporting System (WEIRS) Add New Process form

form to add new process in Washington Emissions Inventory Reporting System (WEIRS)

https://ecology.wa.gov/addnewprocess

Letter to EPA for Partial Withdrawal of SIP Submittal

Letter to EPA to withdraw part of Prevention of Significant Deterioration Rules into the State Implementation Plan

https://ecology.wa.gov/withdrawalltrnewpsdghgsept52014

Washington Emissions Inventory Reporting System (WEIRS) Add New Release Point form

Form to add new release point in Washington Emissions Inventory Reporting System (WEIRS)

https://ecology.wa.gov/addnewreleasepoint

Washington Emissions Inventory Reporting System (WEIRS) Add New Unit form

Form to add new unit in Washington Emissions Inventory Reporting System (WEIRS)

https://ecology.wa.gov/addnewunit

The Kent, Seattle, and Tacoma Second 10‐Year Limited Maintenance Plan for Particulate Matter (PM10)

State Implementation Plan Revision for a Second 10-Year Particulate Matter (PM10) Maintenance Plan for three Puget Sound areas

https://ecology.wa.gov/seattlekenttacomalimitedmaintenanceplanpm10

RS Manager Data Center air permit approval order 14AQ-E582

This is the 2014 air quality permit approval order for RS Manager Data Center in Moses Lake.

https://ecology.wa.gov/20141029rsmanager14aqe582

Microsoft Columbia Data Center - Notice of Construction permit

Notice of Construction permit for Microsoft Columbia Data Center, 8/19/14

https://ecology.wa.gov/microsoft-columbia-noc

Microsoft Columbia Data Center - Technical Support Document for Notice of Construction permit

Technical Support Document for Notice of Construction permit for Microsoft Columbia Data Center, 8/19/14

https://ecology.wa.gov/microsoft-columbia-tsd

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

Notice of Construction permit and Technical Support Document for Vantage Data Center, 3/18/13

https://ecology.wa.gov/vantagefinalpermit

Microsoft Oxford Data Center - Notice of Construction permit

Notice of Construction Permit for Microsoft Oxford Data Center, 8/15/14

https://ecology.wa.gov/microsoftoxford-noc

Microsoft Oxford Data Center - Technical Support Document for Notice of Construction permit

Notice of Construction Technical Support Document for Microsoft Oxford Data Center, 8/15/14

https://ecology.wa.gov/microsoftoxford-tsd-final

Microsoft Oxford Data Center - Response to Comments

Response to Comments for Microsoft Oxford Data Center, 8/15/14

https://ecology.wa.gov/oxfordresponsivenesssumm-part1

Microsoft Oxford Data Center - Response to Comments Appendices

Appendices to Response to Comments for Microsoft Oxford Data Center, 8/15/14

https://ecology.wa.gov/oxfordresponsivenesssumm-part2

Microsoft Oxford Data Center - Health Impact Assessment Recommendation

Health Impact Assessment (Second Tier Review) Recommendation for Microsoft Oxford Data Center, 8/12/14

https://ecology.wa.gov/microsoftoxfordhiarecommendationupdated

Microsoft Oxford Data Center - Health Impact Assessment letter

Health Impact Assessment (Second Tier Review) Letter for Microsoft Oxford Data Center, 6/13/14

https://ecology.wa.gov/microsoftoxfordtier2letter-06132014

Microsoft Oxford Data Center - Notice of Construction application

Notice of Construction Application for Microsoft Oxford, 6/11/14

https://ecology.wa.gov/final-project-oxford-noc-rpt-06-11-14

Microsoft Oxford Data Center - Health Impact Assessment

Health Impact Assessment (Second Tier Review) for Microsoft Oxford, 6/11/14

https://ecology.wa.gov/final-project-oxford-risk-analysis-rpt-06-11-14

Microsoft Oxford Data Center Map

Map of proposed project location of Microsoft Oxford Data Center, 1/14

https://ecology.wa.gov/microsoftoxforddatacenter