F0/100
MENDOTA — Water Quality Report 2026
Serving 6,926 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0990550
Violations
31
Contaminant Test Results
EPA Violation History
3
Violations (last 5yr)
2
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
TIER 3Unresolved
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, 2025Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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 MENDOTA
Is MENDOTA water safe to drink?
MENDOTA water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 31 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has MENDOTA detected?
31 contaminants were tested in MENDOTA's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does MENDOTA have any EPA violations?
Yes, MENDOTA has 31 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, Other, MR. 25 are health-based violations.
How many people does MENDOTA serve?
MENDOTA serves approximately 6,926 people, Illinois. The system provides water to 1 community: Mendota.
What type of water does MENDOTA provide?
MENDOTA sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0990550.
How does MENDOTA compare to other utilities in Illinois?
MENDOTA 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.