F19/100
OAK CREEK WATERWORKS — Water Quality Report 2026
Serving 32,104 people · Wisconsin
Water Source
Surface Water
County
—
System ID
WI2410172
Violations
58
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
1
Health-Related
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – May 29, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Disinfection byproduct treatment technique failure
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 OAK CREEK WATERWORKS
Is OAK CREEK WATERWORKS water safe to drink?
OAK CREEK WATERWORKS water receives a grade of F (19/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 58 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has OAK CREEK WATERWORKS detected?
69 contaminants were tested in OAK CREEK WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does OAK CREEK WATERWORKS have any EPA violations?
Yes, OAK CREEK WATERWORKS has 58 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MR. 5 are health-based violations.
How many people does OAK CREEK WATERWORKS serve?
OAK CREEK WATERWORKS serves approximately 32,104 people, Wisconsin. The system provides water to 1 community: Oak Creek.
What type of water does OAK CREEK WATERWORKS provide?
OAK CREEK WATERWORKS sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WI2410172.
How does OAK CREEK WATERWORKS compare to other utilities in Wisconsin?
OAK CREEK WATERWORKS scores 19/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Wisconsin state page for a full comparison of water systems.