B79/100
STOCKTON — Water Quality Report 2026
Serving 1,728 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0850450
Violations
21
Contaminant Test Results
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Exceeded the MCL for disinfection byproducts
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2022 – September 30, 2022Enforcement: 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 STOCKTON
Is STOCKTON water safe to drink?
STOCKTON water receives a grade of B (79/100), which is considered good. Out of 1 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has STOCKTON detected?
1 contaminants were tested in STOCKTON's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does STOCKTON have any EPA violations?
Yes, STOCKTON has 21 EPA violation(s) on record, with the most recent in 2022. Violation types include MR.
How many people does STOCKTON serve?
STOCKTON serves approximately 1,728 people, Illinois. The system provides water to 1 community: Stockton.
What type of water does STOCKTON provide?
STOCKTON sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0850450.
How does STOCKTON compare to other utilities in Illinois?
STOCKTON scores 79/100 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.