Tap Truth EPA drinking water records, in plain English

Public water system record

Inola Water Works Inc

Serves Inola, Rogers County, OK · 1,589 people served

Federal records show 3 health-based violations and 6 monitoring/reporting issues for Inola Water Works Inc in the last ten years. The most serious issue in this window was a Total Trihalomethanes (TTHMs) violation that EPA lists as archived, not resolved.

  • OK3006612
  • INOLA
  • OK
  • 1,589 served

System profile

Source water Purchased surface water
ZIP 74036
EPA system ID OK3006612

Verify this system on EPA ECHO →

Health-based violations, last 10 years
3
Resolved
1
Unresolved
0
Archived by EPA
2
Any acute record
No
Monitoring issues, last 10 years
6

Key facts

  • Inola Water Works Inc buys its water from Mayes Co RWD # 2.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.085 mg/L, federal limit 0.08 mg/L (1.1 times the limit), 2025.
  • Most recent formal enforcement: compliance order (no penalty) by Oklahoma, October 2025.
  • Record on file since 1991, with 5 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 689 unknown out of 689 service lines.

Check whether Inola Water Works Inc serves your address

Address suggestions by Mapbox

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 0.085 mg/L, federal limit 0.08 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
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, 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 Resolved No

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Apr 1, 2025 Resolved
LEAD AND COPPER RULE REVISIONS
RPT
 Oct 17, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Sep 1, 2024 Resolved
Chlorine
Monitoring and reporting
 Sep 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Feb 1, 2018 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Apr 1, 2017 Resolved

Full record since 1991

EPA's records for Inola Water Works Inc go back to 1991. Before October 19, 2016 they list 5 health-based violations (5 resolved) and 17 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 4
2000s 2 2
2010 to October 18, 2016 3 11
October 19, 2016 to 2019 0 2
2020s 3 4

Most recent health-based violation before October 19, 2016: Total Coliform, began August 2012, Resolved.

Show all 5 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Aug 1, 2012 Resolved
Total Coliform
Contaminant limit exceeded
 Nov 1, 2010 Resolved
Total Coliform
Contaminant limit exceeded
 Jul 1, 2010 Resolved
Total Coliform
Contaminant limit exceeded
 Jul 1, 2008 Resolved
Total Coliform
Contaminant limit exceeded
 Aug 1, 2007 Resolved

Enforcement actions

Oklahoma regulators took 1 formal enforcement action against Inola Water Works Inc in 2025. The most recent was a compliance order (no penalty) in October 2025.

Date By Action Violations covered
Oct 20, 2025 Oklahoma Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)

What the violations mean

Total Trihalomethanes (TTHMs)

2 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

Inola Water Works Inc buys its water from Mayes Co RWD # 2. It lists no wells or intakes of its own.

Buys water from

Annual water quality report

Inola Water Works Inc 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