B63/100
DWIGHT — Water Quality Report 2026
Serving 4,400 people · Illinois
Water Source
Groundwater
County
—
System ID
IL1050250
Violations
10
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.60 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
1
Health-Related
TIER 3Resolved
Exceeded the Maximum Residual Disinfectant Level
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2023 – September 30, 2023Enforcement: Formal — state order issued
TIER 2Resolved
Exceeded the Maximum Contaminant Level (running average)
When: July 1, 2023 – September 30, 2023Enforcement: Formal — state order issued
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 DWIGHT
Is DWIGHT water safe to drink?
DWIGHT water receives a grade of B (63/100), which is considered good. Out of 52 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has DWIGHT detected?
52 contaminants were tested in DWIGHT's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does DWIGHT have any EPA violations?
Yes, DWIGHT has 10 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, MCL, TT. 4 are health-based violations.
How many people does DWIGHT serve?
DWIGHT serves approximately 4,400 people, Illinois. The system provides water to 1 community: Dwight.
What type of water does DWIGHT provide?
DWIGHT sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1050250.
How does DWIGHT compare to other utilities in Illinois?
DWIGHT scores 63/100 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.