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Public water system record

Elkhorn Waterworks

Serves Elkhorn, Walworth County, WI · 10,317 people served

Federal records show 6 health-based violations and 3 monitoring/reporting issues for Elkhorn Waterworks in the last ten years. The most serious issue in this window was a resolved Combined Radium (-226 and -228) violation.

  • WI2650062
  • ELKHORN
  • WI
  • 10,317 served

System profile

Source water Groundwater
ZIP 53121
EPA system ID WI2650062

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
3

Key facts

  • Elkhorn Waterworks draws water from 5 wells (1 of them for emergency, seasonal or other part-time use).
  • Highest measured level in the last 10 years: Combined Radium (-226 and -228), 10.07 pCi/L, federal limit 5 pCi/L (2 times the limit), 2019.
  • Most recent formal enforcement: consent decree or court judgment by Wisconsin, June 2022.
  • Record on file since 1991, with 6 health-based violations before October 19, 2016.
  • Lead pipe inventory: 364 lead and 1,631 unknown out of 3,601 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
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 9.111 pCi/L, federal limit 5 pCi/L (1.8 times the limit)
 340 Jan 1, 2021 Resolved No
Lead and Copper Rule
Treatment technique failure
 350 Nov 1, 2020 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 9.534 pCi/L, federal limit 5 pCi/L (1.9 times the limit)
 340 Oct 1, 2020 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 10.07 pCi/L, federal limit 5 pCi/L (2 times the limit)
 340 Jul 1, 2019 Resolved No
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 9.8 pCi/L, federal limit 5 pCi/L (2 times the limit)
 340 Apr 1, 2019 Resolved No
Arsenic
Contaminant limit exceeded
Measured 0.0185 mg/L, federal limit 0.01 mg/L (1.9 times the limit)
 330 Oct 1, 2018 Resolved No

Monitoring and reporting issues

Since October 2016

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

Issue Start date Status
Public Notice
OTHER
 Nov 1, 2021 Resolved
E. coli
Monitoring and reporting
 Oct 28, 2021 Resolved
Public Notice
OTHER
 Nov 7, 2018 Resolved

Full record since 1991

EPA's records for Elkhorn Waterworks go back to 1991. Before October 19, 2016 they list 6 health-based violations (5 resolved, 1 archived by EPA without a recorded fix) and 61 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 4 29
2000s 1 7
2010 to October 18, 2016 1 25
October 19, 2016 to 2019 3 1
2020s 3 2

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

Show all 6 health-based violations before October 19, 2016
Contaminant Start date Status
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 5.73 pCi/L, federal limit 5 pCi/L (1.1 times the limit)
 Jan 1, 2015 Resolved
Lead and Copper Rule
Treatment technique failure
 Jan 1, 2004 Resolved
Lead and Copper Rule
Treatment technique failure
 Jan 1, 1993 Resolved
Lead and Copper Rule
Treatment technique failure
 Jan 1, 1993 Resolved
Lead and Copper Rule
Treatment technique failure
 Jan 1, 1993 Resolved
Lead and Copper Rule
Treatment technique failure
 Jan 1, 1993 Archived

Enforcement actions

Wisconsin regulators took 1 formal enforcement action against Elkhorn Waterworks in 2022, filed as 2 records in EPA's data. The most recent was a consent decree or court judgment in June 2022.

Date By Action Violations covered
Jun 29, 2022 Wisconsin Consent decree or court judgment 2 violations (2 health-based): Lead and Copper Rule, Arsenic

What the violations mean

Combined Radium (-226 and -228)

4 incidents

Test results for Combined Radium (-226 and -228) were above the federal limit (a maximum contaminant level violation).

The utility had to notify customers about each of these violations.

Lead and Copper Rule

1 incident

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

The utility had to notify customers about this violation.

Arsenic

1 incident

Arsenic exceeded the federal limit

Long-term arsenic exposure is linked to cancer and cardiovascular effects

Where the water comes from

Elkhorn Waterworks draws water from 5 wells (1 of them for emergency, seasonal or other part-time use).

Annual water quality report

Elkhorn Waterworks 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 Wisconsin.

Certified drinking water labs by state EPA guidance for private wells