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Public water system record

Dewar

Serves an area of Okmulgee County, OK that includes Dewar · 917 people served

Federal records show 14 health-based violations and 5 monitoring/reporting issues for Dewar in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.

  • OK3005613
  • DEWAR
  • OK
  • 917 served

System profile

Source water Purchased surface water
ZIP 74431
EPA system ID OK3005613

Verify this system on EPA ECHO →

Health-based violations, last 10 years
14
Resolved
11
Unresolved
1
Archived by EPA
2
Any acute record
No
Monitoring issues, last 10 years
5

Key facts

  • Dewar buys its water from Henryetta Municipal Authority.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2019.
  • Most recent formal enforcement: compliance order (no penalty) by Oklahoma, December 2025.
  • Record on file since 1992, with 6 health-based violations before October 19, 2016.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Oct 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.083 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Oct 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
 350 Oct 17, 2024 Active No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Jul 1, 2022 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Jul 1, 2022 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Apr 1, 2022 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Apr 1, 2022 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Jan 1, 2022 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Jan 1, 2022 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.065 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Oct 1, 2021 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Oct 1, 2021 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 220 Apr 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.092 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 220 Jan 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2018 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Revised Total Coliform Rule
Monitoring violation
 Dec 1, 2024 Resolved
Chlorine
Monitoring and reporting
 Dec 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Nov 1, 2024 Resolved
Chlorine
Monitoring and reporting
 Nov 1, 2024 Resolved
LEAD AND COPPER RULE REVISIONS
RPT
 Oct 17, 2024 Active

Full record since 1992

EPA's records for Dewar go back to 1992. Before October 19, 2016 they list 6 health-based violations (5 resolved, 1 archived by EPA without a recorded fix) and 19 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 2 1
2000s 2 12
2010 to October 18, 2016 2 6
October 19, 2016 to 2019 3 0
2020s 11 5

Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began July 2015, Resolved.

Show all 6 health-based violations before October 19, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 Jul 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Jan 1, 2015 Resolved
Total Coliform
Contaminant limit exceeded
 May 1, 2008 Resolved
Total Coliform
Contaminant limit exceeded
 Feb 1, 2008 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 1999 Archived
Total Coliform
Contaminant limit exceeded
 Jul 1, 1997 Resolved

Enforcement actions

Oklahoma regulators took 10 formal enforcement actions against Dewar between 2015 and 2025. The most recent was a compliance order (no penalty) in December 2025.

Date By Action Violations covered
Dec 22, 2025 Oklahoma Compliance order (no penalty) 2 violations (2 health-based): Total Trihalomethanes (TTHMs)
Feb 3, 2023 Oklahoma Compliance order with a penalty 8 violations (8 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Sep 29, 2022 Oklahoma Compliance order (no penalty) 4 violations (4 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Apr 20, 2022 Oklahoma Compliance order (no penalty) 2 violations (2 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5)
Jan 4, 2022 Oklahoma Compliance order (no penalty) 2 violations (2 health-based): Haloacetic Acids (HAA5)
Jun 28, 2019 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Mar 25, 2019 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Dec 7, 2018 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Oct 7, 2015 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Apr 9, 2015 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Total Trihalomethanes (TTHMs)

What the violations mean

Total Trihalomethanes (TTHMs)

8 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Haloacetic Acids (HAA5)

5 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

LEAD AND COPPER RULE REVISIONS

1 incident

The system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Dewar buys its water from Henryetta Municipal Authority. It lists no wells or intakes of its own.

Buys water from

Annual water quality report

Dewar must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Oklahoma.

Certified drinking water labs by state EPA guidance for private wells