Drinking Water Compliance OS

Somerton, 09

Cocopah West Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace EPA Region 9’s official records. Always confirm current status with EPA Region 9 before making decisions based on this information.

System facts

System ID (PWSID)
090400071
System type
Community Water System
Population served
325
Service connections
90
Ownership
Native American tribal
Water source
groundwater (wells)

Violation history

  • Report Sample Result/Fail Monitor (RTCR)

    Revised Total Coliform Rule

    May 1, 2025 – June 23, 2025

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    January 1, 2020 – December 31, 2025

    Archived
  • Public Notification Violation for NPDWR Violation

    Public Notice

    December 1, 2014 – July 1, 2015

    Resolved
  • Failure To Address Deficiency

    Health-based

    Groundwater Rule

    December 1, 2014 – July 1, 2015

    Resolved
  • Failure To Address Deficiency

    Health-based

    Groundwater Rule

    December 1, 2014 – July 1, 2015

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    December 1, 2014 – July 1, 2015

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    November 1, 2013 – November 30, 2013

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    September 1, 2013 – September 30, 2013

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    September 1, 2012 – September 30, 2012

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    June 1, 2012 – June 30, 2012

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    May 1, 2012 – May 31, 2012

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    April 1, 2012 – April 30, 2012

    Resolved
  • Follow-up Or Routine LCR Tap M/R

    Lead and Copper Rule

    January 1, 2011 – February 20, 2014

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    January 1, 2010 – December 31, 2010

    Resolved
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    January 1, 2010 – December 31, 2010

    Resolved
  • Monitoring and Reporting (DBP)

    Total Haloacetic Acids (HAA5)

    January 1, 2009 – December 31, 2009

    Resolved
  • Monitoring and Reporting (DBP)

    TTHM

    January 1, 2009 – December 31, 2009

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2009 – December 31, 2009

    Resolved
  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    September 1, 2008 – September 30, 2008

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2006 – March 31, 2010

    Resolved
  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    July 1, 2006 – July 31, 2006

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    June 1, 2006 – June 30, 2006

    Resolved
  • Monitoring, Routine Minor (TCR)

    Coliform (TCR)

    May 1, 2006 – May 31, 2006

    Resolved
  • Monitoring, Repeat Major (TCR)

    Coliform (TCR)

    May 1, 2006 – May 31, 2006

    Resolved
  • Monitoring, Repeat Minor (TCR)

    Coliform (TCR)

    April 1, 2006 – April 30, 2006

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    October 1, 2005 – October 31, 2005

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    July 1, 2005 – July 31, 2005

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2005 – March 31, 2010

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    June 1, 2005 – June 30, 2005

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    May 1, 2005 – May 31, 2005

    Resolved
  • Monitoring, Repeat Major (TCR)

    Coliform (TCR)

    April 1, 2005 – April 30, 2005

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2005 – December 31, 2005

    Resolved
  • Monitoring, Regular

    Benzo(a)pyrene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Dalapon

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Diquat

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Endothall

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Glyphosate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) adipate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    OXAMYL

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Simazine

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Di(2-ethylhexyl) phthalate

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Picloram

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Hexachlorocyclopentadiene

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Carbofuran

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Atrazine

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    LASSO

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    2,3,7,8-TCDD

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    HEXACHLOROBENZENE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    Total Polychlorinated Biphenyls (PCB)

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 2004 – December 31, 2004

    Resolved
  • Monitoring, Regular

    ETHYLENE DIBROMIDE

    January 1, 2004 – December 31, 2004

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2002 – March 31, 2010

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2001 – March 31, 2010

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    December 1, 2000 – December 31, 2000

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2000 – March 31, 2010

    Resolved
  • Initial Tap Sampling for Pb and Cu

    Lead and Copper Rule

    January 1, 1998 – April 23, 2004

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 1998 – December 31, 1998

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    May 1, 1997 – May 31, 1997

    Resolved
  • Monitoring, Regular

    Nitrate

    January 1, 1997 – December 31, 1997

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    November 1, 1996 – November 30, 1996

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    October 1, 1996 – October 31, 1996

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    September 1, 1996 – September 30, 1996

    Resolved
  • Initial Tap Sampling for Pb and Cu

    Lead and Copper Rule

    July 1, 1996 – February 24, 2004

    Resolved
  • Monitoring, Regular

    Cadmium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Barium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Thallium, Total

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Beryllium, Total

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Antimony, Total

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Selenium

    January 1, 1996 – December 31, 1996

    Resolved
  • Initial Tap Sampling for Pb and Cu

    Lead and Copper Rule

    January 1, 1996 – February 24, 2004

    Resolved
  • Monitoring, Regular

    Mercury

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    CYANIDE

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Regular

    Chromium

    January 1, 1996 – December 31, 1996

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    June 1, 1994 – June 30, 1994

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    May 1, 1994 – May 31, 1994

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    March 1, 1993 – March 31, 1993

    Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

Contact

Cocopah Indian Tribe

9286272102

Somerton, AZ 85350