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Conformity Adequacy Review: Region 9

State Implementation Plans (SIP) Submissions that EPA has Found Adequate or Inadequate 
Region 9: Arizona, California, Hawaii, Nevada, and 
the territories of Guam and American Samoa

For more information about adequacy review, return to the main adequacy page.

Contacts: Karina O'Connor, (CA, NV) at 775-434-8176 or
John J. Kelly, (CA) at 415-947-4151 or
Wienke Tax, (AZ) at 415-947-4192 or
Ginger Vagenas, (CA) at 415-972-3964 or 
R9.adequacy@epa.gov, U.S. EPA Region 9, 75 Hawthorne St., San Francisco, CA 94105.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.

Arizona
Area Pollutant SIP Submission Finding  (date budgets apply) Additional Information/ Comments
Bullhead City pm10 limited maintenance plan Adequate (8/26/2002)
FR Notice
Budgets found adequate through SIP approval process.
Miami pm10 limited maintenance plan   Adequacy not completed on PM10 maintenance plan budgets. SIP submittal dated July 2008.
Maricopa County 8-hour ozone attainment demonstration Adequate (6/13/2012)
FR Notice
Budgets found adequate through SIP approval process.
Nogales pm10 attainment demonstration Adequate (9/25/2012)
FR Notice
Budgets found adequate through SIP approval process.
Payson City pm10 limited maintenance plan Adequate (5/19/2014)
FR Notice
Budgets found adequate through the SIP approval process.
Adequate (8/26/2002)
FR Notice
Budgets found adequate through SIP approval process.
Pima County carbon
monoxide
maintenance plan Adequate (12/8/1999)
Letter 1 
Letter 2
FR Notice
Budgets found adequate through the adequacy review process.
Phoenix (Maricopa and Pinal Counties)
8-hour ozone attainment demonstration Adequate (11/9/2007)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
pm10 5% plan Adequate (12/20/2013)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
Withdrawn (1/31/2011)
Letter
Budgets previously found adequate on the 7/1/08 FR Notice.
attainment demonstration Adequate (4/21/2000)
Letter
FR Notice
PM10 budget for Maricopa County applies to entire non-attainment area including Pinal County. Budgets found adequate through the adequacy review process.
Inadequate (12/27/1999)
Letter
FR Notice
 
Phoenix (Maricopa County) carbon monoxide maintenance plan Adequate (3/3/2016)
FR Notice
Budgets found adequate through the SIP approval process.
Adequate (10/14/2003)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
attainment demonstration (serious area) Adequate (11/1/2001)
Letter
FR Notice
Revision to budget from 12/14/99. Budgets found adequate through the adequacy review process.
Adequate (12/14/1999)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
attainment demonstration (moderate area) Inadequate (5/5/1999) Determination made under old process
Tucson carbon monoxide limited maintenance plan Adequate (12/21/2009)
FR Notice
Budgets found adequate through the SIP approval process.
Yuma County pm10 maintenance plan Adequate (6/27/2007)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
attainment demonstration Inadequate (11/16/1999)
Letter
FR Notice
 
California
Area Pollutant SIP Submission Finding (date budgets apply) Additional Information/ Comments
Bakersfield Metropolitan Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
Chico Urbanized Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
Coso Junction pm10 maintenance plan Adequate (9/3/2010)
FR Notice
Budgets found adequate through SIP approval process.
East Kern County 8-hour ozone early progress plan Adequate (12/10/2008)
FR Notice
Budgets found adequate through adequacy review process.
Fresno Urbanized Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
Imperial County 2006 pm2.5 attainment plan  

Plan withdrawn (7/11/2017)
Letter

8-hour ozone early progress plan Adequate (5/20/2008)
Letter
Enclosure
FR Notice
Budgets found adequate through the adequacy review process.
Indian Wells pm10 maintenance plan Adequate (5/7/2003)
FR Notice
Budgets found adequate by virtue of SIP approval.
Lake Tahoe North Shore Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
Lake Tahoe South Shore Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
Los Angeles (Coachella) pm10 attainment demonstration Adequate (4/9/2004)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
Adequate (4/18/2003)
Letter
FR Notice
Budgets found adequate through SIP approval process.
Inadequate (1/4/2000)
Letter
FR Notice
 
Los Angeles - San Bernadino Counties (Western Mohave Desert) 8-hour ozone early progress plan Adequate (5/20/2008)
Letter
Enclosure
FR Notice
Budgets found adequate through the adequacy review process.
Mammoth Lakes pm10 maintenance plan Adequate (10/5/2015)
FR Notice
Budgets found adequate through SIP approval process.
Modesto Urbanized Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
Portola 2012 PM2.5

attainment plan

  2012 PM2.5 budgets originally posted for adequacy on May 8, 2017.  Adequacy restarted on January 5, 2018 to include 2021 as well as 2019 and 2022 budgets.
Riverside County (Coachella Valley) 8-hour ozone early progress plan Adequate (5/22/2008)
Letter
Enclosure
FR Notice
Budgets found adequate through the adequacy review process.
Sacramento Metro Area pm10 maintenance plan Adequate (12/8/2011)
Letter
FR Notice (PDF)(1 pp,  140K, published November 23, 2011, About PDF)
Budgets found adequate through the adequacy review process.
8-hr ozone attainment demonstration and reasonable further progress Adequate / Inadequate (1/29/2015)
FR Notice
Budgets found adequate through the SIP approval process.
Adequate / Inadequate (8/12/2009)
Letter
FR Notice
Budgets found adequate / inadequate through the adequacy review process.
reasonable further progress Adequate (3/29/2006)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
Sacramento Urbanized Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
San Bernardino County pm10 attainment demonstration Inadequate (1/4/2000)
Letter
FR Notice
 
San Diego Area

2008 8-hour ozone

reasonable further progress plan Adequate (12/4/2017)
Letter
FR Notice (printed 11/17/17, 82 FR 54339)
Budgets found adequate through the adequacy review process.
1997 8-hour ozone maintenance plan Adequate (4/4/2013)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
attainment plan Adequate (6/9/2008)
Letter and Enclosure
FR Notice
Budgets found adequate through the adequacy review process.
carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
San Francisco Bay Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
San Joaquin Valley 2008 8-hour ozone Attainment demonstration

Adequate (7/14/2017)
82 FR 29547 (Printed 6/29/2017)
Letter 

Budgets found adequate through the adequacy process
1997 8-hour ozone attainment demonstration Adequate (3/01/2012)
FR Notice
Budgets found adequate through SIP approval process.
attainment demonstration and reasonable further progress plan Adequate (2/6/2009)
Letter and Enclosure
FR Notice
Budgets found adequate through the adequacy review process.
2006 pm2.5 attainment plan Adequate (5/2/2016)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
pm2.5 attainment plan Adequate (11/9/2011)
FR Notice (PDF)(32 pp, 427 K, published November 9, 2011,  About PDF)
Regional insignificance finding for re-entrained road dust made through the SIP approval process.
reasonable further progress and attainment plan Adequate / Inadequate (5/27/2010)
Letter
FR Notice
Regional insignifcance finding for PM2.5 and NOx made through the adequacy review process.
pm10 maintenance plan Adequate (11/12/2008)
FR Notice
Budgets found adequate through SIP approval process.
attainment demonstration Adequate (5/26/2004)
FR Notice
Budgets found adequate through SIP approval process.
attainment demonstration Inadequate (5/5/1999) Determination made under old process
Searles Valley pm10 attainment demonstration Inadequate (1/4/2000)
Letter
FR Notice
 
South Coast 2006 pm2.5 attainment plan Adequate (1/22/2018)
Letter
83 FR 679 (Printed 1/5/2018)
Budgets found adequate through the adequacy review process
impracticability demonstration Adequate (4/14/2016)
FR Notice
Budgets not acted on due to demonstration of impracticability.
8-hour ozone attainment demonstration Adequate (3/1/2012)
FR Notice
Budgets found adequate through SIP approval process.
pm2.5 attainment plan Adequate (11/9/2011)
FR Notice (PDF)(29 pp, 400 K, published November 9, 2011, About PDF)
Budgets found adequate through SIP approval process.
8-hour ozone and pm2.5 reasonable further progress, attainment plan, and out-year budgets Adequate / Inadequate (5/30/2008)
Letter
Attachment
FR Notice
Budgets found adequate / inadequate through the adequacy review process.

The May 15, 2008 adequacy FR notice incorrectly stated that the 2017 NOx budget for the 8-hour ozone standard was 32 tpd. The adequate 2017 NOx budget for ozone is actually 232 tpd. This typographical error was corrected in a June 18, 2008 FR notice

nitrogen dioxide maintenance plan Adequate (1/4/2010)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
maintenance plan Adequate (4/9/2004)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
pm10 attainment demonstration Adequate (4/18/2003)
Letter
FR Notice
Budgets found adequate through SIP approval process. Budgets replace those posted on 06/24/99.
Stockton Urbanized Area carbon monoxide maintenance plan Adequate (1/30/2006)
FR Notice
Budgets found adequate through SIP approval process.
Ventura 8-hour ozone early progress plan Adequate (5/20/2008)
Letter
Enclosure
FR Notice
Budgets found adequate through the adequacy review process.
Yuba City-Marysville pm2.5 maintenance plan Adequate (9/9/2014)
FR Notice
Budgets found adequate through the adequacy review process
Nevada
Area Pollutant SIP Submission Finding (date budgets apply) Additional Information/ Comments
Clark County
(Las Vegas)
8-hour ozone maintenance plan Adequate (2/7/2013)
FR Notice
Budgets found adequate through SIP approval process.
early progress plan Adequate (5/29/2009)
FR Notice
Budgets found adequate through the adequacy review process.
carbon
monoxide
maintenance plan Adequate (9/27/2010)
FR Notice
Budgets found adequate through the SIP approval process.
attainment demonstration Adequate (12/15/2000)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
Inadequate (2/17/2000)
Letter
FR Notice
 
Inadequate (5/5/1999) Determination made under old process
pm10 maintenance plan Adequate (10/16/2014)
FR Notice
Budgets found adequate through the SIP approval process
attainment demonstration Adequate (1/26/2002)
Letter
FR Notice
Response to CommentsAdequacy Review Table. Budgets found adequate through the adequacy review process
Inadequate (11/16/1999)
Letter
FR Notice
 
Lake Tahoe carbon monoxide limited maintenance plan Adequate (2/13/2004)
FR Direct Final Rule
Budgets found adequate through SIP approval process.
Reno (Truckee Meadows, Washoe County) pm10 maintenance plan Adequate (12/8/2015)
FR Notice
Budgets found adequate through SIP approval process.
Adequate (6/2/2010)
Letter
FR Notice
Budgets found adequate through the adequacy review process.
carbon monoxide
second maintenance plan
Adequate (10/31/2016)
FR Notice (PDF)(10 pp, 278 K, published August 30, 2016, About PDF)
Budgets found adequate through the SIP approval process
maintenance plan Adequate (3/30/2006)
Letter
FR Notice
Budgets found adequate through the adequacy review process.

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