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Public water system record

Sequoyah Co. RWD #4

Serves an area of Sequoyah County, OK that includes Brent and Sallisaw · 1,750 people served

Federal records show 4 health-based violations and 3 monitoring/reporting issues for Sequoyah Co. RWD #4 in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • OK3006809
  • SALLISAW
  • OK
  • 1,750 served

System profile

Source water Purchased surface water
ZIP 74955
EPA system ID OK3006809

Verify this system on EPA ECHO →

Health-based violations, last 10 years
4
Resolved
4
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
3

Key facts

  • Sequoyah Co. RWD #4 buys its water from Sallisaw.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2018.
  • Most recent formal enforcement: compliance order (no penalty) by Oklahoma, June 2018.
  • Record on file since 1995, with 0 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 52 unknown out of 823 service lines.

Check whether Sequoyah Co. RWD #4 serves your address

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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 0.089 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 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 220 Jan 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.09 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 0.084 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
Revised Total Coliform Rule
Monitoring violation
 Jan 1, 2025 Resolved
Chlorine
Monitoring and reporting
 Jan 1, 2025 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Jun 30, 2018 Resolved

Full record since 1995

EPA's records for Sequoyah Co. RWD #4 go back to 1995. Before October 19, 2016 they list no health-based violations and 11 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 4
2000s 0 5
2010 to October 18, 2016 0 2
October 19, 2016 to 2019 4 1
2020s 0 2

Enforcement actions

Oklahoma regulators took 2 formal enforcement actions against Sequoyah Co. RWD #4 in 2018. The most recent was a compliance order (no penalty) in June 2018.

Date By Action Violations covered
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)

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

Where the water comes from

Sequoyah Co. RWD #4 buys its water from Sallisaw. It lists no wells or intakes of its own.

Buys water from

Annual water quality report

Sequoyah Co. RWD #4 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