F0/100
MONMOUTH — Water Quality Report 2026
Serving 8,902 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1870150
Violations
32
Contaminant Test Results
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: November 28, 2024 – November 20, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: October 1, 2024 – December 31, 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 MONMOUTH
Is MONMOUTH water safe to drink?
MONMOUTH water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 32 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has MONMOUTH detected?
31 contaminants were tested in MONMOUTH's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does MONMOUTH have any EPA violations?
Yes, MONMOUTH has 32 EPA violation(s) on record, with the most recent in 2024. Violation types include Other, MCL, MR. 29 are health-based violations.
How many people does MONMOUTH serve?
MONMOUTH serves approximately 8,902 people, Illinois. The system provides water to 1 community: Monmouth.
What type of water does MONMOUTH provide?
MONMOUTH sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1870150.
How does MONMOUTH compare to other utilities in Illinois?
MONMOUTH scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Illinois state page for a full comparison of water systems.