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Public water system record

MO American Ironton

Serves Ironton, Iron County, MO · 1,460 people served

Federal records show 10 health-based violations and no monitoring/reporting issues for MO American Ironton 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.

  • MO4010402
  • CHESTERFIELD
  • MO
  • 1,460 served

System profile

Source water Surface water
ZIP 63017
EPA system ID MO4010402

Verify this system on EPA ECHO →

Health-based violations, last 10 years
10
Resolved
8
Unresolved
0
Archived by EPA
2
Any acute record
No
Monitoring issues, last 10 years
0

Key facts

  • MO American Ironton draws water from 1 surface water intake and 1 reservoir.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 95.43 µg/L, federal limit 80 µg/L (1.2 times the limit), 2025.
  • Record on file since 1993, with 6 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 729 unknown out of 761 service lines.

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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 95.43 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 84.53 µg/L, federal limit 80 µg/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 82 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Jul 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 83.2 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Apr 1, 2024 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 61.45 µg/L, federal limit 60 µg/L (at or just above the limit)
 220 Jan 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 88.25 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Jan 1, 2024 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 85.88 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Oct 1, 2023 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 88 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 81 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Apr 1, 2022 Resolved No
Stage 1 Disinfection Byproducts Rule
Treatment technique failure
 210 Feb 1, 2022 Resolved No

Full record since 1993

EPA's records for MO American Ironton go back to 1993. Before October 19, 2016 they list 6 health-based violations (1 resolved, 5 archived by EPA without a recorded fix) and 5 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 1 0
2000s 4 5
2010 to October 18, 2016 1 0
2020s 10 0

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

Show all 6 health-based violations before October 19, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 87 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Apr 1, 2016 Resolved
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Jul 1, 2005 Archived
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Apr 1, 2005 Archived
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Jan 1, 2005 Archived
Haloacetic Acids (HAA5)
Contaminant limit exceeded
 Oct 1, 2004 Archived
Total Coliform
Contaminant limit exceeded
 Aug 1, 1993 Archived

What the violations mean

Total Trihalomethanes (TTHMs)

8 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Haloacetic Acids (HAA5)

1 incident

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Stage 1 Disinfection Byproducts Rule

1 incident

The system did not meet a treatment requirement of the Stage 1 Disinfectants and Disinfection Byproducts Rule

Byproducts form when disinfectants react with natural material in water. Long-term exposure above federal limits may increase cancer risk

Where the water comes from

MO American Ironton draws water from 1 surface water intake and 1 reservoir. It also has an emergency connection to Pilot Knob PWS.

Emergency or part-time connections to

Annual water quality report

MO American Ironton 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 Missouri.

Certified drinking water labs by state EPA guidance for private wells