Tap Truth EPA drinking water records, in plain English

Public water system record

Keytesville PWS

Serves Keytesville, Chariton County, MO · 500 people served

Federal records show 4 health-based violations and 3 monitoring/reporting issues for Keytesville PWS 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.

  • MO2010420
  • KEYTESVILLE
  • MO
  • 500 served

System profile

Source water Groundwater
ZIP 65261
EPA system ID MO2010420

Verify this system on EPA ECHO →

Health-based violations, last 10 years
4
Resolved
2
Unresolved
0
Archived by EPA
2
Any acute record
No
Monitoring issues, last 10 years
3

Key facts

  • Keytesville PWS draws water from 3 wells (1 of them for emergency, seasonal or other part-time use).
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 95.4 µg/L, federal limit 80 µg/L (1.2 times the limit), 2025.
  • Record on file since 1991, with 6 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 235 service lines.

Check whether Keytesville PWS 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 95.4 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Oct 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 93.05 µg/L, federal limit 80 µg/L (1.2 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 84 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Jul 1, 2022 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 83 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Oct 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
Groundwater Rule
Monitoring and reporting
 Jul 1, 2025 Resolved
Groundwater Rule
Monitoring and reporting
 Jan 1, 2024 Resolved
Groundwater Rule
Monitoring and reporting
 Dec 1, 2020 Resolved

Full record since 1991

EPA's records for Keytesville PWS go back to 1991. Before October 19, 2016 they list 6 health-based violations (6 resolved) and 9 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 1 2
2000s 2 4
2010 to October 18, 2016 3 3
October 19, 2016 to 2019 1 0
2020s 3 3

Most recent health-based violation before October 19, 2016: Total Coliform, began November 2015, Resolved.

Show all 6 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Nov 1, 2015 Resolved
Groundwater Rule
Treatment technique failure
 Feb 1, 2012 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 2010 Resolved
Total Coliform
Contaminant limit exceeded
 Jul 1, 2008 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 2007 Resolved
Total Coliform
Contaminant limit exceeded
 Jul 1, 1991 Resolved

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

Keytesville PWS draws water from 3 wells (1 of them for emergency, seasonal or other part-time use). 1 other community water system buys water from Keytesville PWS.

Community systems that buy water from it

Annual water quality report

Keytesville PWS 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 Keytesville PWS 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 Missouri.

Certified drinking water labs by state EPA guidance for private wells