A88/100
COMBINED LOCKS WATERWORKS — Water Quality Report 2026
Serving 3,609 people · Wisconsin
Water Source
Purchased Groundwater
County
—
System ID
WI4450409
Violations
8
Contaminant Test Results
EPA Violation History
5
Violations (last 5yr)
1
Unresolved
1
Health-Related
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – December 13, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: October 17, 2024 – June 25, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Violation related to Turbidity
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024 – December 31, 2024Rule: Stage 2 DBPREnforcement: 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 COMBINED LOCKS WATERWORKS
Is COMBINED LOCKS WATERWORKS water safe to drink?
COMBINED LOCKS WATERWORKS water receives a grade of A (88/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has COMBINED LOCKS WATERWORKS detected?
31 contaminants were tested in COMBINED LOCKS WATERWORKS's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does COMBINED LOCKS WATERWORKS have any EPA violations?
Yes, COMBINED LOCKS WATERWORKS has 8 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MR. 1 are health-based violations.
How many people does COMBINED LOCKS WATERWORKS serve?
COMBINED LOCKS WATERWORKS serves approximately 3,609 people, Wisconsin. The system provides water to 1 community: Combined Locks.
What type of water does COMBINED LOCKS WATERWORKS provide?
COMBINED LOCKS WATERWORKS sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI4450409.
How does COMBINED LOCKS WATERWORKS compare to other utilities in Wisconsin?
COMBINED LOCKS WATERWORKS scores 88/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Wisconsin state page for a full comparison of water systems.