A94/100
WARREN — Water Quality Report 2026
Serving 1,323 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0850500
Violations
6
Contaminant Test Results
EPA Violation History
5
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – June 23, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2024 – June 23, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – February 1, 2024Enforcement: Resolving — corrective action underway
TIER 3Unresolved
Disinfection byproduct treatment technique failure
When: June 15, 2023Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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: April 1, 2022 – June 17, 2022Rule: Stage 1 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 WARREN
Is WARREN water safe to drink?
WARREN water receives a grade of A (94/100), which is considered excellent. Out of 21 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has WARREN detected?
21 contaminants were tested in WARREN's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does WARREN have any EPA violations?
Yes, WARREN has 6 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MR.
How many people does WARREN serve?
WARREN serves approximately 1,323 people, Illinois. The system provides water to 1 community: Warren.
What type of water does WARREN provide?
WARREN sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0850500.
How does WARREN compare to other utilities in Illinois?
WARREN scores 94/100 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.