B72/100
MARYVILLE — Water Quality Report 2026
Serving 10,150 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1190750
Violations
9
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.46 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
1
Unresolved
0
Health-Related
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 MARYVILLE
Is MARYVILLE water safe to drink?
MARYVILLE water receives a grade of B (72/100), which is considered good. Out of 32 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MARYVILLE detected?
32 contaminants were tested in MARYVILLE's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does MARYVILLE have any EPA violations?
Yes, MARYVILLE has 9 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MCL. 2 are health-based violations.
How many people does MARYVILLE serve?
MARYVILLE serves approximately 10,150 people, Illinois. The system provides water to 1 community: Maryville.
What type of water does MARYVILLE provide?
MARYVILLE sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1190750.
How does MARYVILLE compare to other utilities in Illinois?
MARYVILLE scores 72/100 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.