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D30/100

JOHNSON CREEK WATERWORKS — Water Quality Report 2026

Serving 3,318 people · Wisconsin

Water Source
Groundwater
County
—
System ID
WI1280107
Violations
39

Contaminant Test Results

1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
Lead (90th percentile)
0.003 mg/L0.015 mg/LAbove Goal

EPA Violation History

10

Violations (last 5yr)

1

Unresolved

1

Health-Related

TIER 3Resolved

Monitoring Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: November 1, 2024 – November 30, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved

Treatment technique violation

When: October 17, 2024 – June 10, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: October 17, 2024Rule: Ground Water RuleVerify on EPA.gov
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2024 – August 21, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2024 – August 21, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: October 1, 2022 – December 31, 2022Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2022 – September 30, 2022Enforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2022 – March 31, 2022Enforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2021 – July 12, 2021Enforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2021 – July 12, 2021Enforcement: Resolving — corrective action underway

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Frequently Asked Questions About JOHNSON CREEK WATERWORKS

Is JOHNSON CREEK WATERWORKS water safe to drink?

JOHNSON CREEK WATERWORKS water receives a grade of D (30/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 39 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has JOHNSON CREEK WATERWORKS detected?

1 contaminants were tested in JOHNSON CREEK WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).

Does JOHNSON CREEK WATERWORKS have any EPA violations?

Yes, JOHNSON CREEK WATERWORKS has 39 EPA violation(s) on record, with the most recent in 2024. Violation types include MON, TT, Other. 7 are health-based violations.

How many people does JOHNSON CREEK WATERWORKS serve?

JOHNSON CREEK WATERWORKS serves approximately 3,318 people, Wisconsin. The system provides water to 1 community: Johnson Creek.

What type of water does JOHNSON CREEK WATERWORKS provide?

JOHNSON CREEK WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI1280107.

How does JOHNSON CREEK WATERWORKS compare to other utilities in Wisconsin?

JOHNSON CREEK WATERWORKS scores 30/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Wisconsin state page for a full comparison of water systems.

Cities Served

Johnson Creek