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Public water system record

Jefferson County Water Authority

On record as serving Festus and Herculaneum, Jefferson County, MO · Serves 25 people

Federal records show no health-based violations and no monitoring or reporting issues for Jefferson County Water Authority in the last ten years.

  • MO6071352
  • FESTUS
  • MO
  • 25 served

System profile

Source water Groundwater under direct influence
ZIP 63028
EPA system ID MO6071352

Verify this system on EPA ECHO →

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

Key facts

  • Jefferson County Water Authority draws water from 2 wells.
  • Record on file since 2010, with 6 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.

None since October 2016, and no monitoring or reporting violations either.

Full record since 2010

EPA's records for Jefferson County Water Authority go back to 2010. Before October 19, 2016 they list 6 health-based violations (6 resolved) and no monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
2010 to October 18, 2016 6 0

Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began April 2011, Resolved.

Show all 6 health-based violations before October 19, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 85.11 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Apr 1, 2011 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 85.85 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Jan 1, 2011 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 86.12 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Oct 1, 2010 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 85.69 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Jul 1, 2010 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 87.11 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Apr 1, 2010 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 84.24 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Jan 1, 2010 Resolved

Where the water comes from

Jefferson County Water Authority draws water from 2 wells. 2 other community water systems buy water from Jefferson County Water Authority.

Community systems that buy water from it

Annual water quality report

Jefferson County Water 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 Jefferson County Water 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 Missouri.

Certified drinking water labs by state EPA guidance for private wells