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Public water system record

Poteau Valley Improvement Authority

Serves an area of Le Flore County, OK · 10 people served

Federal records show 10 health-based violations and 8 monitoring/reporting issues for Poteau Valley Improvement Authority in the last ten years. The most serious issue in this window was a Haloacetic Acids (HAA5) violation that EPA lists as archived, not resolved.

  • OK1020104
  • WISTER
  • OK
  • 10 served

System profile

Source water Surface water
ZIP 74966
EPA system ID OK1020104

Verify this system on EPA ECHO →

Health-based violations, last 10 years
10
Resolved
3
Unresolved
0
Archived by EPA
7
Any acute record
Yes
Monitoring issues, last 10 years
8

Key facts

  • Poteau Valley Improvement Authority draws water from 2 surface water intakes.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.068 mg/L, federal limit 0.06 mg/L (1.1 times the limit), 2025.
  • Most recent formal enforcement: compliance order (no penalty) by Oklahoma, April 2025.
  • Record on file since 1984, with 12 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 29 unknown out of 147 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
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, 2025 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 0.068 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Jul 1, 2025 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 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Jul 1, 2025 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 0.062 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Apr 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Interim Enhanced Surface Water Treatment Rule
Treatment technique failure
 120 Feb 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 Yes
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
 350 Oct 17, 2024 Resolved 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 Jan 1, 2023 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, 2022 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 Jul 1, 2019 Resolved No
Surface Water Treatment Rule
Treatment technique failure
 120 Aug 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
LEAD AND COPPER RULE REVISIONS
RPT
 Oct 17, 2024 Resolved
2,4-D
Monitoring and reporting
 Jan 1, 2024 Resolved
Atrazine
Monitoring and reporting
 Jan 1, 2024 Resolved
Glyphosate
Monitoring and reporting
 Jan 1, 2024 Resolved
Chlorite
Monitoring and reporting
 Jun 1, 2023 Resolved
Chlorite
Monitoring and reporting
 Sep 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
Chlorite
Monitoring and reporting
 Aug 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
Surface Water Treatment Rule
Monitoring and reporting
 Jul 1, 2017 Resolved

Full record since 1984

EPA's records for Poteau Valley Improvement Authority go back to 1984. Before October 19, 2016 they list 12 health-based violations (10 resolved, 2 archived by EPA without a recorded fix) and 2 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 1 0
1990s 3 1
2000s 6 1
2010 to October 18, 2016 2 0
October 19, 2016 to 2019 2 1
2020s 8 7

Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began July 2013, Resolved.

Show all 12 health-based violations before October 19, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Jul 1, 2013 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 Jan 1, 2010 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.084 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 Oct 1, 2009 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 Jan 1, 2008 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 2007 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Jan 1, 2003 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Oct 1, 2002 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Jul 1, 2002 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Mar 1, 1999 Archived
Surface Water Treatment Rule
Treatment technique failure
 Oct 1, 1993 Archived
Total Coliform
Contaminant limit exceeded
 Jul 1, 1993 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
 Dec 1, 1984 Resolved

Enforcement actions

Oklahoma regulators took 11 formal enforcement actions against Poteau Valley Improvement Authority between 1999 and 2025. The most recent was a compliance order (no penalty) in April 2025.

Date By Action Violations covered
Apr 3, 2025 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Interim Enhanced Surface Water Treatment Rule
May 18, 2023 Oklahoma Compliance order with a penalty 6 violations (6 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5)
Feb 3, 2023 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Dec 9, 2019 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Haloacetic Acids (HAA5)
Mar 14, 2014 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
May 3, 2010 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Jan 19, 2010 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Aug 28, 2008 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
May 8, 2003 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Haloacetic Acids (HAA5)
Jan 23, 2003 Oklahoma Compliance order with a penalty 1 violation (1 health-based): Haloacetic Acids (HAA5)
Apr 15, 1999 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Surface Water Treatment Rule

What the violations mean

Haloacetic Acids (HAA5)

5 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Total Trihalomethanes (TTHMs)

2 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Interim Enhanced Surface Water Treatment Rule

1 incident

The system did not meet a filtration or treatment requirement for surface water

Inadequate treatment of surface water can let pathogens such as Cryptosporidium and Giardia through

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.

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

Poteau Valley Improvement Authority draws water from 2 surface water intakes. 16 other community water systems buy water from Poteau Valley Improvement Authority. 1 other public water system has an emergency connection to Poteau Valley Improvement Authority.

Community systems that buy water from it

Annual water quality report

Poteau Valley Improvement Authority 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.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Poteau Valley Improvement Authority for a copy.

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