Program Template photo identifier

Air Quality Program

Maintenance SIPs

Once a nonattainment area has reached and maintained the National Ambient Air Quality Standards (NAAQS), Washington may request redesignation to attainment. For the area to be redesignated, the state has to develop a Maintenance State Implementation Plan (SIP) for EPA’s approval. The plan ensures the area will continue to meet the NAAQS for a 20-year period. The initial 10-year plan is reviewed and revised to cover a second 10-year period. For this final plan, some areas may qualify to submit a streamlined plan, called a Limited Maintenance Plan.

Maintenance plans are shown below. Summaries for Washington’s attainment and maintenance plans are on EPA’s web site.

Maintenance Plans

SIP Revision More Information

Draft SIP Revision  for the Spokane County, Washington Second 10 year Limited Maintenance Plan for Carbon Monoxide, (CO)

Spokane Regional Clean Air Agency prepared a maintenance plan for the Spokane County CO Maintenance area and submitted it to Ecology for inclusion in the SIP.   Ecology is providing an opportunity to comment and request a hearing

Since 1997, this maintenance area has met the CO standard. EPA approved the first 10-year plan in 2005. This second plan shows how the area will continue to meet the NAAQS through 2025.

Public Comment Period: March 1 to April 11

April 7, 2016, 9:30 a.m. and 6 p.m. at

Spokane Regional Clean Air Agency

3104 East Augusta Avenue

Spokane, Washington

 To request a hearing, contact Laurie Hulse-Moyer before March 31, 2016.

If a hearing is not requested by the deadline, a cancellation notice will be posted on Ecology’s Public Involvement Calendar.

Contact Laurie Hulse-Moyer at 360-407-6783.

SIP Revision for the Spokane County, Washington Second 10-year Limited Maintenance Plan for Particulate Matter, (PM10)

Spokane Regional Clean Air Agency prepared a maintenance plan for the Spokane County PM10 Maintenance area and submitted it to Ecology for inclusion in the SIP. 

Ecology adopted the Plan on November 24, 2015 and submitted the plan to EPA in January 2016. EPA will accept comments; dates will be announced in the Federal Register; documents will be available on the federal docket.

Since 1994, this maintenance area has met the PM10 standard. EPA approved the first 10-year plan for the area in 2005. This second plan shows how the area will continue to meet the NAAQS through 2025.

Contact Laurie Hulse-Moyer at 360-407-6783.

SIP Revision for the Tacoma-Pierce County PM2.5 Redesignation Request and Maintenance Plan

Approved by EPA March 12, 2015.

Contact Joanna Ekrem at 360-407-6826

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

Approved by EPA August 20, 2014.

Contact Laurie Hulse-Moyer at 360-407-6783.

 

SIP Revision for the Thurston County Second 10-year Limited Maintenance Plan for Particulate Matter (PM10)

Approved by EPA October 3, 2013.

Contact Laurie Hulse-Moyer at 360-407-6783.

 

 

Maintenance Plan Contents

The specific content of each maintenance plan varies depending on the federal requirements and state regulations. In general, a maintenance plan covers the following:

  • Current, comprehensive, and accurate inventories of emissions from all sources.
  • Control strategies to maintain the NAAQS.
  • Supporting statutes and regulations.
  • Other means or programs contributing to maintenance of the NAAQS.
  • Air quality analyses that demonstrate that adequate controls are in place to ensure the area will maintain the NAAQS.
  • Contingency measures that will be implemented if an area fails to maintain the NAAQS.

A Maintenance SIP is developed and approved the same way as an Attainment SIP.


Contact us