A87/100
OAKHILL CORRECTIONAL INST — Water Quality Report 2026
Serving 1,096 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI1130250
Violations
9
Contaminant Test Results
EPA Violation History
6
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 3Resolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 17, 2024 – November 7, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – November 7, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Disinfection byproduct treatment technique failure
TIER 3Unresolved
Disinfection byproduct treatment technique failure
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – November 1, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – November 20, 2024Enforcement: 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 OAKHILL CORRECTIONAL INST
Is OAKHILL CORRECTIONAL INST water safe to drink?
OAKHILL CORRECTIONAL INST water receives a grade of A (87/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has OAKHILL CORRECTIONAL INST detected?
1 contaminants were tested in OAKHILL CORRECTIONAL INST's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does OAKHILL CORRECTIONAL INST have any EPA violations?
Yes, OAKHILL CORRECTIONAL INST has 9 EPA violation(s) on record, with the most recent in 2024. Violation types include RPT, TT, Other. 1 are health-based violations.
How many people does OAKHILL CORRECTIONAL INST serve?
OAKHILL CORRECTIONAL INST serves approximately 1,096 people, Wisconsin. The system provides water to 1 community: Oregon.
What type of water does OAKHILL CORRECTIONAL INST provide?
OAKHILL CORRECTIONAL INST sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI1130250.
How does OAKHILL CORRECTIONAL INST compare to other utilities in Wisconsin?
OAKHILL CORRECTIONAL INST scores 87/100 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.