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Public water system record

City of Mahaska

Serves Mahaska, Washington County, KS · 44 people served

Federal records show 1 health-based violation and 5 monitoring/reporting issues for City of Mahaska in the last ten years. The most serious issue in this window was a resolved Revised Total Coliform Rule violation.

  • KS2020102
  • MAHASKA
  • KS
  • 44 served

System profile

Source water Groundwater
ZIP 66955
EPA system ID KS2020102

Verify this system on EPA ECHO →

Health-based violations, last 10 years
1
Resolved
1
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
5

Key facts

  • City of Mahaska draws water from 1 well.
  • Most recent formal enforcement: compliance order (no penalty) by Kansas, November 2016.
  • Record on file since 1994, with 20 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.

Contaminant Rule family Start date Status Acute
Revised Total Coliform Rule
Treatment technique failure
 110 May 28, 2024 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
 Jul 2, 2025 Active
Chlorine
Monitoring and reporting
 Oct 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Oct 1, 2024 Resolved
Lead and Copper Rule
Monitoring and reporting
 Dec 31, 2020 Active
Lead and Copper Rule
Monitoring and reporting
 Dec 30, 2017 Active

Full record since 1994

EPA's records for City of Mahaska go back to 1994. Before October 19, 2016 they list 20 health-based violations (20 resolved) and 3 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 4 1
2000s 2 1
2010 to October 18, 2016 14 1
October 19, 2016 to 2019 0 1
2020s 1 4

Most recent health-based violation before October 19, 2016: Combined Radium (-226 and -228), began October 2015, Resolved.

Show all 20 health-based violations before October 19, 2016
Contaminant Start date Status
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Oct 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jul 1, 2015 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jul 1, 2014 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 8 pCi/L, federal limit 5 pCi/L (1.6 times the limit)
 Apr 1, 2014 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 8 pCi/L, federal limit 5 pCi/L (1.6 times the limit)
 Jan 1, 2014 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 8 pCi/L, federal limit 5 pCi/L (1.6 times the limit)
 Oct 1, 2013 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 8 pCi/L, federal limit 5 pCi/L (1.6 times the limit)
 Jul 1, 2013 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Apr 1, 2013 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jan 1, 2013 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Oct 1, 2012 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jul 1, 2012 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Apr 1, 2012 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Jan 1, 2012 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
 Oct 1, 2011 Resolved
Total Coliform
Contaminant limit exceeded
 Oct 1, 2001 Resolved
Total Coliform
Contaminant limit exceeded
 Sep 1, 2001 Resolved
Total Coliform
Contaminant limit exceeded
 Jul 1, 1998 Resolved
Total Coliform (acute)
Contaminant limit exceeded
 Jul 1, 1998 Resolved
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 5.5 pCi/L, federal limit 5 pCi/L (1.1 times the limit)
 Jan 1, 1998 Resolved
Total Coliform
Contaminant limit exceeded
 Aug 1, 1997 Resolved

Enforcement actions

Kansas regulators took 2 formal enforcement actions against City of Mahaska between 2014 and 2016. The most recent was a compliance order (no penalty) in November 2016.

Date By Action Violations covered
Nov 2, 2016 Kansas Compliance order (no penalty) 2 violations (2 health-based): Combined Radium (-226 and -228)
Dec 4, 2014 Kansas Compliance order (no penalty) 12 violations (12 health-based): Combined Radium (-226 and -228)

What the violations mean

Revised Total Coliform Rule

1 incident

The system did not meet a requirement of the Revised Total Coliform Rule

Coliform and E. coli rules protect against bacteria in the distribution system

Where the water comes from

City of Mahaska draws water from 1 well.

Annual water quality report

City of Mahaska 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 City of Mahaska 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 Kansas.

Certified drinking water labs by state EPA guidance for private wells