B60/100
POSEN — Water Quality Report 2026
Serving 5,331 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0312520
Violations
25
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
2
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Resolved
Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 2, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Surface water 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 POSEN
Is POSEN water safe to drink?
POSEN water receives a grade of B (60/100), which is considered good. Out of 34 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has POSEN detected?
34 contaminants were tested in POSEN's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does POSEN have any EPA violations?
Yes, POSEN has 25 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, Other, MR. 3 are health-based violations.
How many people does POSEN serve?
POSEN serves approximately 5,331 people, Illinois. The system provides water to 1 community: Posen.
What type of water does POSEN provide?
POSEN 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 IL0312520.
How does POSEN compare to other utilities in Illinois?
POSEN scores 60/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Illinois state page for a full comparison of water systems.