F14/100
WASCO SD — Water Quality Report 2026
Serving 4,000 people · Illinois
Water Source
Groundwater
County
—
System ID
IL0890110
Violations
22
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.70 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (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
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 WASCO SD
Is WASCO SD water safe to drink?
WASCO SD water receives a grade of F (14/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 22 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WASCO SD detected?
32 contaminants were tested in WASCO SD's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does WASCO SD have any EPA violations?
Yes, WASCO SD has 22 EPA violation(s) on record, with the most recent in 2022. Violation types include MR, MCL. 14 are health-based violations.
How many people does WASCO SD serve?
WASCO SD serves approximately 4,000 people, Illinois.
What type of water does WASCO SD provide?
WASCO SD sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0890110.
How does WASCO SD compare to other utilities in Illinois?
WASCO SD scores 14/100 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.