B78/100
DELAVAN — Water Quality Report 2026
Serving 1,743 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1790150
Violations
6
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.033 mg/L | 0.015 mg/L | Over Limit |
EPA Violation History
2
Violations (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: July 1, 2024 – September 30, 2024Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2022 – November 2, 2022Rule: Ground Water RuleEnforcement: 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 DELAVAN
Is DELAVAN water safe to drink?
DELAVAN water receives a grade of B (78/100), which is considered good. Out of 2 contaminants tested, 2 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has DELAVAN detected?
2 contaminants were tested in DELAVAN's water. Notable contaminants include Lead (90th percentile), Copper (90th percentile). 2 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does DELAVAN have any EPA violations?
Yes, DELAVAN has 6 EPA violation(s) on record, with the most recent in 2024. Violation types include MR.
How many people does DELAVAN serve?
DELAVAN serves approximately 1,743 people, Illinois. The system provides water to 1 community: Delavan.
What type of water does DELAVAN provide?
DELAVAN sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1790150.
How does DELAVAN compare to other utilities in Illinois?
DELAVAN scores 78/100 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.