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Public water system record

Sequoyah Co. RWD #3

Serves an area of Sequoyah County, OK that includes Sallisaw and Hanson · 1,040 people served

Federal records show 5 health-based violations and 5 monitoring/reporting issues for Sequoyah Co. RWD #3 in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.

  • OK3006804
  • SALLISAW
  • OK
  • 1,040 served

System profile

Source water Purchased surface water
ZIP 74955
EPA system ID OK3006804

Verify this system on EPA ECHO →

Health-based violations, last 10 years
5
Resolved
4
Unresolved
1
Any acute record
No
Monitoring issues, last 10 years
5

Key facts

  • Sequoyah Co. RWD #3 buys its water from Sallisaw.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit), 2018.
  • Most recent formal enforcement: compliance order (no penalty) by EPA, March 2026.
  • Record on file since 1992, with 0 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
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
 350 Oct 17, 2024 Active
Enforcement action in place
 No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Apr 1, 2018 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 Jan 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.087 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 1, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Jul 1, 2017 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
Monitoring and reporting
 Jul 1, 2025 Active
Lead and Copper Rule
Monitoring and reporting
 Jan 1, 2025 Active
LEAD AND COPPER RULE REVISIONS
RPT
 Oct 17, 2024 Active
Enforcement action in place
Lead and Copper Rule
Monitoring and reporting
 Jul 1, 2024 Active
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2023 Active

Full record since 1992

EPA's records for Sequoyah Co. RWD #3 go back to 1992. Before October 19, 2016 they list no health-based violations and 8 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 7
2000s 0 1
October 19, 2016 to 2019 4 0
2020s 1 5

Enforcement actions

Oklahoma regulators and EPA took 6 formal enforcement actions against Sequoyah Co. RWD #3 between 1995 and 2026. The most recent was a compliance order (no penalty) in March 2026.

Date By Action Violations covered
Mar 12, 2026 EPA Compliance order (no penalty) 2 violations (1 health-based): LEAD AND COPPER RULE REVISIONS
Jun 4, 2018 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Apr 20, 2018 Oklahoma Compliance order (no penalty) 3 violations (3 health-based): Total Trihalomethanes (TTHMs)
Jan 24, 1996 Oklahoma Compliance order (no penalty) 1 violation: Total Coliform
Sep 20, 1995 Oklahoma Compliance order (no penalty) 1 violation: Total Coliform
Jul 20, 1995 Oklahoma Compliance order (no penalty) 1 violation: Total Coliform

What the violations mean

Total Trihalomethanes (TTHMs)

4 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder 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

Sequoyah Co. RWD #3 buys its water from Sallisaw. It lists no wells or intakes of its own. 1 other community water system buys water from Sequoyah Co. RWD #3.

Buys water from

Community systems that buy water from it

Annual water quality report

Sequoyah Co. RWD #3 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