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Public water system record

Marshall PWS

Serves Marshall, Saline County, MO · 12,934 people served

Federal records show 6 health-based violations and no monitoring/reporting issues for Marshall PWS in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • MO2010502
  • MARSHALL
  • MO
  • 12,934 served

System profile

Source water Groundwater
ZIP 65340
EPA system ID MO2010502

Verify this system on EPA ECHO →

Health-based violations, last 10 years
6
Resolved
6
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
0

Key facts

  • Marshall PWS draws water from 10 wells.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 89 µg/L, federal limit 80 µg/L (1.1 times the limit), 2017.
  • Record on file since 1991, with 6 health-based violations before October 19, 2016.
  • Lead pipe inventory: 4 lead and 4,543 unknown out of 5,818 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 81.5 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Jul 1, 2018 Resolved No
Groundwater Rule
Treatment technique failure
 140 May 1, 2018 Resolved 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, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 89 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Apr 1, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 82 µg/L, federal limit 80 µg/L (at or just above the limit)
 220 Jan 1, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 87 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Oct 1, 2016 Resolved No

Full record since 1991

EPA's records for Marshall PWS go back to 1991. Before October 19, 2016 they list 6 health-based violations (6 resolved) and 2 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 2
2010 to October 18, 2016 6 0
October 19, 2016 to 2019 5 0

Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began October 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)
 Oct 1, 2016 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 92 µg/L, federal limit 80 µg/L (1.2 times the limit)
 Jul 1, 2016 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 82.2 µg/L, federal limit 80 µg/L (at or just above the limit)
 Jul 1, 2015 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 90.38 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Oct 1, 2014 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 87.9 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Jul 1, 2014 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 84.18 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Jul 1, 2013 Resolved

What the violations mean

Total Trihalomethanes (TTHMs)

5 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Groundwater Rule

1 incident

The system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Marshall PWS draws water from 10 wells. 5 other community water systems buy water from Marshall PWS.

Community systems that buy water from it

Annual water quality report

Marshall 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 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.

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