Conformity Adequacy Review: Region 10
State Implementation Plans (SIP) Submissions that EPA has Found Adequate or Inadequate
Region 10: Alaska, Idaho, Oregon, and Washington
For more information about adequacy review, return to the main adequacy page.
This page provides a list of state implementation plans that include motor vehicle emission budgets that EPA Region 10 has found either adequate or inadequate for the purposes of transportation conformity.
Contact: Tess Bloom, (AK, ID, OR, WA) U.S. EPA Region 10, 1200 Sixth Ave., Seattle, WA 98101; phone: 206-553-6362. email: bloom.tess@epa.gov.
| Alaska | ||||
|---|---|---|---|---|
| Area | Pollutant | SIP Submission | Finding (date budgets apply) | Additional Information/ Comments |
| Anchorage | carbon monoxide | maintenance plan | Adequate
Letter (12/2011) (pdf)
| Budgets found adequate through the adequacy review process. |
| Adequate FR Notice (06/23/2004) (pdf) (147 KB) | SIP found adequate through SIP approval process. | |||
| attainment demonstration | Adequate FR Notice (09/18/2002) (pdf) (132 KB) | Budgets adequate by virtue of SIP approval. | ||
| Inadequate (05/14/1999) | Determination made under old process. | |||
| Eagle River | PM10 | limited maintenance plan | Adequate
Letter (4/2012) (pdf)
| Budgets found adequate through the adequacy review process. |
| Fairbanks | 2006 PM2.5 | attainment demonstration and reasonable further progress | Adequate (05/23/2025) Letter (04/04/2025) (pdf) FR Notice (05/08/2023) | Budgets found adequate through the adequacy review process |
| carbon monoxide | maintenance plan | Adequate (09/27/2004) | Budgets adequate by virtue of SIP approval. | |
| attainment demonstration | Adequate (04/05/2002) | Budgets found adequate through SIP approval process. | ||
| Inadequate (05/14/1999) | Determination made under old process | |||
| Idaho | ||||
| Area | Pollutant | SIP Submission | Finding (date budgets apply) | Additional Information/ Comments |
| Northern Ada County | PM10 | second limited maintenance plan | Adequate FR Notice (06/06/2013) Letter (Idaho Northern Ada County) (5/2013) (pdf) | Budgets found adequate through adequacy review process. |
| carbon monoxide | limited maintenance plan | Adequate (12/27/2002) FR Notice (10/28/2002) (pdf) (148 KB) | Budgets found adequate through SIP approval process. | |
| Pocatello | PM10 | maintenance plan | Adequate Letter (8/2004) (pdf) FR Notice (09/17/2004) (pdf) (142 KB) | Budgets found adequate through adequacy review process. |
| attainment demonstration | Inadequate (8/14/2000) Letter (6/2000) (pdf) FR Notice (07/28/2000) (pdf) (215 KB) | |||
| Oregon | ||||
| Area | Pollutant | SIP Submission | Finding (date budgets apply) | Additional Information/ Comments |
| Grants Pass | CO | limited maintenance plan | Adequate (09/28/2015) 80 FR 44864 (07/28/2015) | Budgets found adequate through the SIP approval process. |
| PM10 | limited maintenance plan | Adequate (09/28/2015) 80 FR 45431 (07/30/2015) | Budgets found adequate through the SIP approval process. | |
| Klamath Falls | 2006 PM2.5 | attainment plan | Adequate (08/17/2015) 80 FR 45654 (7/31/2015) | Budgets found adequate through the adequacy review process. |
| Medford | PM10 | maintenance plan | Adequate (08/18/2006) FR Notice (06/19/2006) (pdf) (191 KB) | Budgets found adequate through SIP approval process. |
| carbon monoxide | second maintenance plan | Adequate Letter (3/2016) (pdf) 80 FR 54788 (04/28/16) | Budgets found adequate through the adequacy review process. | |
| maintenance plan | Adequate Letter (3/2002) (pdf) FR Notice (04/11/2002) (pdf) (132 KB) | Budgets found adequate through adequacy review process. | ||
| Oakridge | 2006 pm2.5 | attainment plan | Adequate FR Notice (06/16/2017) Letter (Oakridge) (4/2017) (pdf) | Budgets found adequate through the adequacy review process |
| Portland | carbon monoxide | maintenance plan | Adequate FR Notice (01/24/2006) (pdf) (150 KB) | Budgets found adequate through SIP approval process. |
| Salem | carbon monoxide | limited maintenance plan | Adequate (3/02/2009) FR Notice (12/30/2008) (pdf) (7 pp, 163 KB) | Budgets found adequate through SIP approval process. |
| Washington | ||||
| Area | Pollutant | SIP Submission | Finding (date budgets apply) | Additional Information/ Comments |
| Kent, Seattle, and Tacoma | PM10 | Limited maintenance plan | Adequate (08/20/2014) 79 FR 49239 | Budgets found adequate through the SIP approval process. |
| Spokane | PM10 | limited maintenance plan | Adequate (04/12/2016) 81 FR 21470 | Budgets found adequate through the SIP approval process. |
| Adequate (08/30/2005) FR Notice (07/01/2005) (pdf) (182 KB) | Budgets found adequate through SIP approval process. | |||
| carbon monoxide | maintenance plan | Adequate (08/29/2005) FR Notice (06/29/2005) (pdf) (160 KB) | Budgets found adequate through SIP approval process. | |
| attainment demonstration | Adequate Letter (11/2002) (pdf) FR Notice (11/19/2002) (pdf) (133 KB) | Budgets found adequate through adequacy review process. | ||
| Inadequate (5/14/1999) | Determination made under old process | |||
| Tacoma-Pierce County | 2006 PM2.5 | maintenance plan | Adequate (2/10/2015) 80 FR 7347 | Budgets found adequate through the SIP approval process. |
| Vancouver | carbon monoxide | limited maintenance plan | Adequate Letter (11/2007) (pdf) FR Notice (11/19/2007) (pdf) (139 KB) | Budgets found adequate through adequacy review process. |
| Yakima | PM10 | limited maintenance plan | Adequate Letter (12/2004) (pdf) FR Notice (11/12/2004) (pdf) (144 KB) | Budgets found adequate through adequacy review process. |
| carbon monoxide | limited maintenance plan | Adequate (12/31/2002) FR Notice (11/01/2002) (pdf) (155 KB) | Budgets found adequate through the SIP approval process. | |