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Public water system record

Nelson PWS

Serves Nelson, Saline County, MO · 158 people served

Federal records show 9 health-based violations and 3 monitoring/reporting issues for Nelson PWS in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • MO2010559
  • NELSON
  • MO
  • 158 served

System profile

Source water Purchased groundwater
ZIP 65347
EPA system ID MO2010559

Verify this system on EPA ECHO →

Health-based violations, last 10 years
9
Resolved
9
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
3

Key facts

  • Nelson PWS buys its water from Saline County PWSD 3.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 117 µg/L, federal limit 80 µg/L (1.5 times the limit), 2016.
  • Most recent formal enforcement: compliance order with a penalty by Missouri, September 2018.
  • Record on file since 1980, with 3 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 69 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 88 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Oct 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 101 µg/L, federal limit 80 µg/L (1.3 times the limit)
 220 Jul 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 94.4 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Apr 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 94.15 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Jan 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 96 µg/L, federal limit 80 µg/L (1.2 times the limit)
 220 Oct 1, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 101 µg/L, federal limit 80 µg/L (1.3 times the limit)
 220 Jul 1, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 107 µg/L, federal limit 80 µg/L (1.3 times the limit)
 220 Apr 1, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 109 µg/L, federal limit 80 µg/L (1.4 times the limit)
 220 Jan 1, 2017 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 117 µg/L, federal limit 80 µg/L (1.5 times the limit)
 220 Oct 1, 2016 Resolved No

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
LEAD AND COPPER RULE REVISIONS
RPT
 Oct 17, 2024 Resolved
Public Notice
OTHER
 Jan 14, 2018 Resolved
Public Notice
OTHER
 Sep 26, 2017 Resolved

Full record since 1980

EPA's records for Nelson PWS go back to 1980. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 8 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 0 5
2000s 0 3
2010 to October 18, 2016 3 0
October 19, 2016 to 2019 8 2
2020s 0 1

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

Show all 3 health-based violations before October 19, 2016
Contaminant Start date Status
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 117 µg/L, federal limit 80 µg/L (1.5 times the limit)
 Oct 1, 2016 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 120 µg/L, federal limit 80 µg/L (1.5 times the limit)
 Jul 1, 2016 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 90 µg/L, federal limit 80 µg/L (1.1 times the limit)
 Apr 1, 2016 Resolved

Enforcement actions

Missouri regulators took 1 formal enforcement action against Nelson PWS in 2018. The most recent was a compliance order with a penalty in September 2018.

Date By Action Violations covered
Sep 27, 2018 Missouri Compliance order with a penalty 9 violations (9 health-based): Total Trihalomethanes (TTHMs)

What the violations mean

Total Trihalomethanes (TTHMs)

9 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

Nelson PWS buys its water from Saline County PWSD 3. It lists no wells or intakes of its own.

Buys water from

Annual water quality report

Nelson 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 Nelson 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