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Elkhorn, WI Tap Water Quality 2026

Water quality report for Elkhorn, WI — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Elkhorn's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: Elkhorn Waterworks PWSID: WI2650062 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead is 14.00 ppb, 93% of the action level and no violations are open. No PFAS was detected.

C

Elkhorn earns a C for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: 14.00 ppb — 93% of the federal action level
PFAS tested, none detected
13 violations since 2015, 7 health-based
No violations currently open
Elkhorn's lead level vs. all Wisconsin community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: 14.00 ppb — 93% of the federal action level
✓ Lower lead than 1% of Wisconsin utilities
Population Served
8749
~3821 connections
Water Source
Groundwater
Drawn from wells — SDWIS source code GW
Active Violations
0
13 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
93% of EPA action level
14.00 ppb
Action level: 15 ppb
Copper (Cu)
90th percentile of tap samples. SDWIS reports a copper figure only when a system exceeds the action level, so any value here is an exceedance.
112.3% of EPA action level
1,460 ppb
Action level: 1,300 ppb
The 90th-percentile lead result is 14.00 ppb, 93% of the 15 ppb federal action level. The action level is a treatment trigger, not a legal maximum, and it is measured across sampled taps rather than at any single home. Copper reached the action level here; a copper figure appears in SDWIS only when a system triggers it.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
Public Notice OTHER — — 2021 Resolved
E. COLI MONITORING AND REPORTING — 0 2021 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.111 PCI/L 5 pCi/L 2021 Resolved
Lead and Copper Rule TREATMENT TECHNIQUE — TT 2020–2022 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.534 PCI/L 5 pCi/L 2020 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 10.07 PCI/L 5 pCi/L 2019 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 9.8 PCI/L 5 pCi/L 2019 Resolved
Public Notice OTHER — — 2018 Resolved
Arsenic MCL EXCEEDANCE 0.0185 MG/L 0.010 mg/L 2018 Resolved
Public Notice OTHER — — 2015 Resolved
Combined Radium (-226 and -228) MCL EXCEEDANCE 5.73 PCI/L 5 pCi/L 2015 Resolved
TTHM MONITORING AND REPORTING — 0.080 mg/L 2015 Resolved
Total Haloacetic Acids (HAA5) MONITORING AND REPORTING — 0.060 mg/L 2015 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

13 violations are on record since 2015, of which 7 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility Elkhorn Waterworks
PWSID WI2650062
Water source Groundwater — Drawn from wells — SDWIS source code GW
Population served 8,749
Service connections 3,821
Systems serving this area 1
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Elkhorn tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open. Lead is 14.00 ppb, 93% of the action level.
Does Elkhorn water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Elkhorn? ▼
Elkhorn Waterworks (PWSID WI2650062). Groundwater. Drawn from wells — SDWIS source code GW
When was this system last inspected? ▼
It was last inspected on 2025-12-09. No significant deficiencies were recorded.

What Should Elkhorn Residents Do?

1
Consider a filter certified for lead
Look for NSF/ANSI 53 certification for lead reduction.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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