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Public water system record

Langley

Serves an area of Mayes County, OK that includes Langley · 950 people served

Federal records show 11 health-based violations and 2 monitoring/reporting issues for Langley in the last ten years. The most serious issue in this window was a resolved Surface Water Treatment Rule violation.

  • OK1021604
  • LANGLEY
  • OK
  • 950 served

System profile

Source water Surface water
ZIP 74350
EPA system ID OK1021604

Verify this system on EPA ECHO →

Health-based violations, last 10 years
11
Resolved
10
Unresolved
0
Archived by EPA
1
Any acute record
No
Monitoring issues, last 10 years
2

Key facts

  • Langley draws water from 1 surface water intake.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.071 mg/L, federal limit 0.06 mg/L (1.2 times the limit), 2020.
  • Most recent formal enforcement: compliance order (no penalty) by Oklahoma, August 2025.
  • Record on file since 1993, with 6 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 622 service lines.

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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
Surface Water Treatment Rule
Treatment technique failure
 120 Jun 1, 2025 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.063 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Jan 1, 2021 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Oct 1, 2020 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.091 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Jul 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.069 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
 220 Jul 1, 2020 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Apr 1, 2020 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 Apr 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.071 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
 220 Apr 1, 2020 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 Jan 1, 2020 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Oct 1, 2019 Resolved No

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
 Aug 1, 2021 Resolved
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
 Jul 1, 2018 Resolved

Full record since 1993

EPA's records for Langley go back to 1993. Before October 19, 2016 they list 6 health-based violations (4 resolved, 2 archived by EPA without a recorded fix) and 2 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 3 2
2000s 3 0
October 19, 2016 to 2019 2 1
2020s 9 1

Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began July 2005, Resolved.

Show all 6 health-based violations before October 19, 2016
Contaminant Start date Status
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Jul 1, 2005 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Jan 1, 2005 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Oct 1, 2004 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Aug 1, 1999 Archived
Surface Water Treatment Rule
Treatment technique failure
 May 1, 1994 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Aug 1, 1993 Archived

Enforcement actions

Oklahoma regulators took 9 formal enforcement actions against Langley between 2005 and 2025. The most recent was a compliance order (no penalty) in August 2025.

Date By Action Violations covered
Aug 7, 2025 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Surface Water Treatment Rule
Dec 6, 2021 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Mar 25, 2021 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Nov 20, 2020 Oklahoma Compliance order (no penalty) 5 violations (5 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5)
May 8, 2020 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Dec 9, 2019 Oklahoma Compliance order (no penalty) 2 violations (2 health-based): Total Trihalomethanes (TTHMs)
Jan 25, 2006 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Haloacetic Acids (HAA5)
Sep 7, 2005 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Haloacetic Acids (HAA5)
Apr 19, 2005 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Haloacetic Acids (HAA5)

What the violations mean

Total Trihalomethanes (TTHMs)

6 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Haloacetic Acids (HAA5)

4 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Surface Water Treatment Rule

1 incident

The system did not complete a treatment step or action that the Surface Water Treatment Rule requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Langley draws water from 1 surface water intake. It also has an emergency connection to Ketchum PWA. 1 other community water system buys water from Langley. 1 other public water system has an emergency connection to Langley.

Emergency or part-time connections to

Community systems that buy water from it

Annual water quality report

Langley 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