A82/100
ROCHESTER — Water Quality Report 2026
Serving 3,856 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL1671000
Violations
15
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.006 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
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: October 1, 2023 – December 31, 2023Rule: 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 ROCHESTER
Is ROCHESTER water safe to drink?
ROCHESTER water receives a grade of A (82/100), which is considered excellent. Out of 31 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has ROCHESTER detected?
31 contaminants were tested in ROCHESTER's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does ROCHESTER have any EPA violations?
Yes, ROCHESTER has 15 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, Other.
How many people does ROCHESTER serve?
ROCHESTER serves approximately 3,856 people, Illinois. The system provides water to 1 community: Rochester.
What type of water does ROCHESTER provide?
ROCHESTER sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is IL1671000.
How does ROCHESTER compare to other utilities in Illinois?
ROCHESTER scores 82/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Illinois state page for a full comparison of water systems.