CONCHO, OK · Canadian County

CHEYENNE-ARAPAHO (CONCHO) Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of September 3, 2013. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in Canadian County, OK.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Oklahoma’s official records. Always confirm current status with Oklahoma before making decisions based on this information.

System facts

System ID (PWSID): OK2000905
System type: Community Water System
Population served: 2,050
Service connections: 8
Ownership: Native American tribal
Water source: groundwater (wells)

CHEYENNE-ARAPAHO (CONCHO) is one of 511 community water systems in Oklahoma in the 501 to 3,300 people size category, formerly serving 2,050 people from groundwater.

EPA's federal records list this system as inactive in 2013; the record below is historical.

As of August 1, 2026, its federal record holds 49 entries between 1996 and 2013, all of which EPA lists as closed. Nothing has been added since 2013.

Of the 49, 40 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Total Coliform Rules, volatile organic chemicals, and the Consumer Confidence Rule.

Violation history

Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2013 – September 3, 2013
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2013 – September 3, 2013
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
November 1, 2012 – November 30, 2012
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2012 – July 31, 2012
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2012 – September 3, 2013
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2012 – September 3, 2013
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
June 1, 2012 – June 30, 2012
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
June 1, 2012 – June 30, 2012
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
February 1, 2012 – February 29, 2012
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2011 – December 31, 2011
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2011 – September 30, 2011
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2011 – September 3, 2013
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2010 – September 3, 2013
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
November 1, 2009 – November 30, 2009
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
October 1, 2009 – October 31, 2009
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
September 3, 2009 – September 3, 2013
Resolved
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
August 1, 2009 – August 31, 2009
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2009 – August 31, 2009
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2009 – July 31, 2009
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2009 – September 3, 2013
Resolved
Monitoring, Routine (IDSE)
—
Total Haloacetic Acids (HAA5)
July 1, 2009 – June 30, 2010
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
June 1, 2009 – June 30, 2009
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
April 1, 2009 – April 30, 2009
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2008 – September 3, 2013
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
February 1, 2008 – February 29, 2008
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 2008 – January 31, 2008
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
October 1, 2007 – October 31, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2007 – September 30, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2007 – August 31, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2007 – July 31, 2007
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2007 – September 3, 2013
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2007 – December 31, 2007
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2006 – September 3, 2013
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
February 1, 2006 – February 28, 2006
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2004 – December 31, 2007
Resolved
Monitoring, Regular
—
Combined Uranium
January 1, 2004 – December 31, 2007
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2004 – December 31, 2007
Resolved
Monitoring, Regular
—
Gross Beta Particle Activity
January 1, 2004 – December 31, 2007
Resolved
Monitoring, Regular
—
Ethylbenzene
October 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
October 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
October 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Benzene
October 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Carbon tetrachloride
October 1, 2002 – December 31, 2002
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
October 1, 2002 – December 31, 2002
Resolved
Monitoring, Regular
—
CHLOROBENZENE
April 1, 2001 – June 30, 2001
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
April 1, 2001 – June 30, 2001
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
April 1, 2001 – June 30, 2001
Resolved
Monitoring, Regular
—
Styrene
April 1, 2001 – June 30, 2001
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 1996 – December 31, 1996
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
September 1, 2013 – September 3, 2013	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2013 – September 3, 2013	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
November 1, 2012 – November 30, 2012	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 2012 – July 31, 2012	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2012 – September 3, 2013	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2012 – September 3, 2013	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
June 1, 2012 – June 30, 2012	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
June 1, 2012 – June 30, 2012	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
February 1, 2012 – February 29, 2012	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
December 1, 2011 – December 31, 2011	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
September 1, 2011 – September 30, 2011	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2011 – September 3, 2013	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2010 – September 3, 2013	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
November 1, 2009 – November 30, 2009	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
October 1, 2009 – October 31, 2009	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
September 3, 2009 – September 3, 2013	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
August 1, 2009 – August 31, 2009	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 2009 – August 31, 2009	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2009 – July 31, 2009	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2009 – September 3, 2013	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2009 – June 30, 2010	Monitoring, Routine (IDSE)	Total Haloacetic Acids (HAA5)	—	Resolved
June 1, 2009 – June 30, 2009	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
April 1, 2009 – April 30, 2009	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2008 – September 3, 2013	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
February 1, 2008 – February 29, 2008	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2008 – January 31, 2008	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2007 – October 31, 2007	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 2007 – September 30, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 2007 – August 31, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2007 – July 31, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2007 – September 3, 2013	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2007 – December 31, 2007	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
July 1, 2006 – September 3, 2013	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
February 1, 2006 – February 28, 2006	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2004 – December 31, 2007	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
January 1, 2004 – December 31, 2007	Monitoring, Regular	Combined Uranium	—	Resolved
January 1, 2004 – December 31, 2007	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
January 1, 2004 – December 31, 2007	Monitoring, Regular	Gross Beta Particle Activity	—	Resolved
October 1, 2003 – December 31, 2003	Monitoring, Regular	Ethylbenzene	—	Resolved
October 1, 2003 – December 31, 2003	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
October 1, 2003 – December 31, 2003	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
October 1, 2003 – December 31, 2003	Monitoring, Regular	Benzene	—	Resolved
October 1, 2002 – December 31, 2002	Monitoring, Regular	Carbon tetrachloride	—	Resolved
October 1, 2002 – December 31, 2002	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
April 1, 2001 – June 30, 2001	Monitoring, Regular	CHLOROBENZENE	—	Resolved
April 1, 2001 – June 30, 2001	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
April 1, 2001 – June 30, 2001	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
April 1, 2001 – June 30, 2001	Monitoring, Regular	Styrene	—	Resolved
December 1, 1996 – December 31, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

September 3, 2013State no longer subject to Rule2 linked violations
July 15, 2012Federal Compliance achieved1 linked violation
October 12, 2010Federal Compliance achieved2 linked violations
March 3, 2010State Violation/Reminder Notice3 linked violations
February 12, 2010State Public Notification requested5 linked violations
December 14, 2009State Public Notification requested3 linked violations
December 14, 2009State Public Notification requested2 linked violations
December 14, 2009State Public Notification requested3 linked violations
November 23, 2009State Violation/Reminder Notice2 linked violations
October 20, 2009State Violation/Reminder Notice3 linked violations
September 24, 2009State Public Notification requested2 linked violations
September 24, 2009State Public Notification requested2 linked violations
September 24, 2009State Public Notification requested2 linked violations
September 16, 2009State Public Notification received3 linked violations
July 27, 2009State Violation/Reminder Notice2 linked violations
June 7, 2009State Public Notification received2 linked violations
February 23, 2009State Public Notification requested2 linked violations
August 25, 2008State Public Notification requested2 linked violations
August 7, 2008State Violation/Reminder Notice9 linked violations
August 7, 2008State Public Notification requested2 linked violations
August 7, 2008State Violation/Reminder Notice2 linked violations
August 7, 2008State Public Notification requested2 linked violations
April 28, 2008State Administrative/Compliance Order without penalty issued15 linked violations
April 18, 2008State Public Notification requested6 linked violations
April 18, 2008State Violation/Reminder Notice1 linked violation
March 20, 2008State Violation/Reminder Notice2 linked violations
February 25, 2008State Violation/Reminder Notice1 linked violation
February 25, 2008State Public Notification requested25 linked violations
January 22, 2008State Public Notification requested1 linked violation
January 22, 2008State Violation/Reminder Notice1 linked violation
December 20, 2007State Public Notification requested1 linked violation
December 20, 2007State Violation/Reminder Notice1 linked violation
November 20, 2007State Public Notification requested1 linked violation
November 20, 2007State Violation/Reminder Notice2 linked violations
October 22, 2007State Public Notification requested1 linked violation
September 26, 2007State Public Notification requested2 linked violations
August 22, 2007State Public Notification requested3 linked violations
May 24, 2007State Public Notification requested2 linked violations
May 24, 2007State Violation/Reminder Notice1 linked violation
March 15, 2007State Violation/Reminder Notice5 linked violations
December 27, 2006State Violation/Reminder Notice22 linked violations
October 6, 2006State Violation/Reminder Notice13 linked violations
March 20, 2006State Public Notification requested5 linked violations
December 2, 2005State Compliance achieved25 linked violations
December 6, 2004State Compliance achieved41 linked violations
May 15, 2003State Compliance achieved21 linked violations
February 27, 2003State Administrative/Compliance Order with penalty issued46 linked violations
October 29, 2001State Administrative/Compliance Order with penalty issued20 linked violations
October 29, 2001State Administrative/Compliance Order with penalty issued3 linked violations
August 23, 2001State Administrative/Compliance Order with penalty issued1 linked violation

Last known contact on file (system is inactive)

CHEYENNE-ARAPAHO (CONCHO)

405-422-7546

CONCHO, OK 73022