Is CALVIN required to publish a Consumer Confidence Report?

Yes. CALVIN is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is CALVIN’s next Consumer Confidence Report due?

CALVIN’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

CALVIN, OK · Hughes County

CALVIN Water System

Consumer Confidence Report status

CALVIN must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for CALVIN.

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): OK2003201
System type: Community Water System
Population served: 300
Service connections: 138
Ownership: local government
Water source: groundwater (wells)

CALVIN is one of 1,277 community water systems in Oklahoma in the 500 or fewer people size category, serving 300 people from groundwater.

As of August 1, 2026, its federal record holds 41 entries between 1991 and 2025, all of which EPA lists as closed.

Of the 41, 30 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

Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2025 – May 17, 2025
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 2, 2023 – July 2, 2024
Resolved
Monitoring, Regular
—
Combined Uranium
April 1, 2021 – June 30, 2021
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
April 1, 2021 – June 30, 2021
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2020 – December 31, 2020
Resolved
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
May 1, 2015 – May 31, 2015
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 2015 – May 31, 2015
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2014 – July 25, 2016
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2012 – September 1, 2016
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2011 – July 31, 2011
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2011 – September 1, 2016
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 2011 – March 31, 2011
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2010 – December 31, 2010
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 2010 – October 31, 2010
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2010 – September 30, 2010
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2010 – September 1, 2016
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2010 – November 16, 2010
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
October 1, 2009 – October 31, 2009
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 2009 – December 31, 2009
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2008 – September 1, 2016
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 2007 – November 30, 2007
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2007 – September 1, 2016
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2006 – September 1, 2016
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2005 – September 30, 2005
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2004 – September 30, 2004
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2004 – August 31, 2004
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2003 – December 31, 2003
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
Toluene
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2002 – March 31, 2002
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2002 – March 31, 2002
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 1999 – May 31, 1999
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
April 1, 1999 – April 30, 1999
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 1996 – November 30, 1996
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 1991 – July 31, 1991
Resolved

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

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2025 – May 17, 2025	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
October 2, 2023 – July 2, 2024	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
April 1, 2021 – June 30, 2021	Monitoring, Regular	Combined Uranium	—	Resolved
April 1, 2021 – June 30, 2021	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
January 1, 2020 – December 31, 2020	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
May 1, 2015 – May 31, 2015	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Resolved
May 1, 2015 – May 31, 2015	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2014 – July 25, 2016	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2012 – September 1, 2016	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2011 – July 31, 2011	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2011 – September 1, 2016	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
March 1, 2011 – March 31, 2011	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
December 1, 2010 – December 31, 2010	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2010 – October 31, 2010	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
September 1, 2010 – September 30, 2010	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2010 – September 1, 2016	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2010 – November 16, 2010	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 1, 2009 – October 31, 2009	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
July 1, 2008 – September 1, 2016	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
November 1, 2007 – November 30, 2007	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2007 – September 1, 2016	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2006 – September 1, 2016	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
September 1, 2005 – September 30, 2005	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
September 1, 2004 – September 30, 2004	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
August 1, 2004 – August 31, 2004	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2003 – December 31, 2003	Monitoring, Regular	Nitrate	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	Toluene	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 2002 – March 31, 2002	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
May 1, 1999 – May 31, 1999	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
April 1, 1999 – April 30, 1999	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
November 1, 1996 – November 30, 1996	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 1991 – July 31, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

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

Enforcement actions

May 17, 2025State Compliance achieved1 linked violation
July 2, 2024State Compliance achieved1 linked violation
January 18, 2024State Violation/Reminder Notice1 linked violation
April 4, 2023State Public Notification received1 linked violation
April 4, 2023State Public Notification received1 linked violation
April 4, 2023State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
April 4, 2023State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
April 4, 2023State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
April 4, 2023State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
April 4, 2023State Public Notification received1 linked violation
April 4, 2023State Public Notification received1 linked violation
March 2, 2022State Compliance achieved4 linked violations
August 13, 2021State Violation/Reminder Notice4 linked violations
August 13, 2021State Compliance achieved1 linked violation
August 13, 2021State Public Notification requested4 linked violations
April 15, 2021State Public Notification received1 linked violation
February 12, 2021State Public Notification requested1 linked violation
February 12, 2021State Violation/Reminder Notice1 linked violation
September 11, 2019State Compliance achieved3 linked violations
November 29, 2017State Compliance achieved1 linked violation
November 17, 2017State Violation/Reminder Notice1 linked violation
November 14, 2017State Compliance achieved1 linked violation
September 1, 2016State Compliance achieved4 linked violations
September 1, 2016State Compliance achieved3 linked violations
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 4, 2016State Compliance achieved1 linked violation
August 4, 2016State Compliance achieved1 linked violation
July 25, 2016State Compliance achieved1 linked violation
July 25, 2016State Compliance achieved1 linked violation
July 25, 2016State Compliance achieved1 linked violation
February 19, 2016State Violation/Reminder Notice1 linked violation
July 8, 2015State Public Notification received1 linked violation
July 8, 2015State Public Notification received1 linked violation
July 1, 2015State Public Notification requested1 linked violation
July 1, 2015State Violation/Reminder Notice1 linked violation
July 1, 2015State Public Notification requested1 linked violation
July 1, 2015State Violation/Reminder Notice1 linked violation
May 31, 2015State Compliance achieved1 linked violation
January 14, 2015State Violation/Reminder Notice1 linked violation
January 14, 2015State Violation/Reminder Notice1 linked violation
April 8, 2010State Public Notification requested1 linked violation
April 8, 2010State Violation/Reminder Notice1 linked violation
March 2, 2010State Compliance achieved1 linked violation
February 25, 2010State Violation/Reminder Notice1 linked violation
February 8, 2010State Public Notification requested1 linked violation
February 8, 2010State Violation/Reminder Notice1 linked violation
January 27, 2010State Public Notification requested1 linked violation
January 27, 2010State Violation/Reminder Notice1 linked violation
December 14, 2009State Public Notification requested1 linked violation
December 14, 2009State Violation/Reminder Notice1 linked violation
September 22, 2008State Compliance achieved2 linked violations
September 15, 2008State Public Notification received2 linked violations
July 25, 2008State Public Notification requested2 linked violations
July 25, 2008State Administrative/Compliance Order with penalty issued2 linked violations
January 1, 2008State Compliance achieved1 linked violation
December 20, 2007State Public Notification requested1 linked violation
December 20, 2007State Violation/Reminder Notice1 linked violation
December 1, 2007State Compliance achieved1 linked violation
December 19, 2005State Violation/Reminder Notice2 linked violations
October 20, 2005State Public Notification requested3 linked violations
October 20, 2005State Violation/Reminder Notice3 linked violations
March 1, 2005State Compliance achieved1 linked violation
December 6, 2004State Compliance achieved2 linked violations
May 16, 2002State Administrative/Compliance Order with penalty issued20 linked violations
April 19, 2002State Compliance achieved1 linked violation
November 27, 2001State Administrative/Compliance Order with penalty issued1 linked violation
March 10, 1998State Compliance achieved3 linked violations
November 5, 1996State Administrative/Compliance Order without penalty issued1 linked violation
August 27, 1993State Boil Water Order4 linked violations

Common questions

Is CALVIN required to publish a Consumer Confidence Report?: Yes. CALVIN is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is CALVIN’s next Consumer Confidence Report due?: CALVIN’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does CALVIN have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for CALVIN.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

CALVIN

405-645-2434

CALVIN, OK 74531