TapSafetyReport
C49/100

WILLIAMS BAY WATERWORKS — Water Quality Report 2026

Serving 2,601 people · Wisconsin

Water Source
Groundwater
County
—
System ID
WI2650060
Violations
44

Contaminant Test Results

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

EPA Violation History

7

Violations (last 5yr)

5

Unresolved

1

Health-Related

TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: September 11, 2025Rule: Ground Water RuleVerify on EPA.gov
TIER 2Unresolved

Other non-health-based violation

When: July 1, 2025Rule: Ground Water RuleVerify on EPA.gov
TIER 3Unresolved

Failed to issue initial public notification

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

When: January 1, 2025Rule: Ground Water RuleVerify on EPA.gov
TIER 3Unresolved

Monitoring / Reporting Violation

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

When: January 1, 2025 – June 30, 2025Rule: Ground Water RuleVerify on EPA.gov
TIER 3Unresolved

Monitoring / Reporting Violation

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

When: January 1, 2025 – June 30, 2025Rule: Ground Water RuleVerify on EPA.gov
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2021 – October 18, 2021Enforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2021 – October 18, 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 WILLIAMS BAY WATERWORKS

Is WILLIAMS BAY WATERWORKS water safe to drink?

WILLIAMS BAY WATERWORKS water receives a grade of C (49/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 44 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has WILLIAMS BAY WATERWORKS detected?

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

Does WILLIAMS BAY WATERWORKS have any EPA violations?

Yes, WILLIAMS BAY WATERWORKS has 44 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, TT, MR. 1 are health-based violations.

How many people does WILLIAMS BAY WATERWORKS serve?

WILLIAMS BAY WATERWORKS serves approximately 2,601 people, Wisconsin. The system provides water to 1 community: Williams Bay.

What type of water does WILLIAMS BAY WATERWORKS provide?

WILLIAMS BAY WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI2650060.

How does WILLIAMS BAY WATERWORKS compare to other utilities in Wisconsin?

WILLIAMS BAY WATERWORKS scores 49/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Wisconsin state page for a full comparison of water systems.

Cities Served

Williams Bay