C59/100
CALUMET CITY — Water Quality Report 2026
Serving 37,000 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0310390
Violations
21
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.015 mg/L | 0.015 mg/L | Over Limit |
EPA Violation History
6
Violations (last 5yr)
3
Unresolved
1
Health-Related
TIER 3Unresolved
Disinfection byproduct treatment technique failure
When: August 2, 2025Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – September 29, 2025Enforcement: Resolving — corrective action underway
TIER 3Unresolved
Monitoring Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 2Unresolved
Treatment technique violation
When: October 17, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2023 – July 1, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2022 – June 15, 2023Enforcement: 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 CALUMET CITY
Is CALUMET CITY water safe to drink?
CALUMET CITY water receives a grade of C (59/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 21 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has CALUMET CITY detected?
69 contaminants were tested in CALUMET CITY's water. Notable contaminants include Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does CALUMET CITY have any EPA violations?
Yes, CALUMET CITY has 21 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MON, TT. 3 are health-based violations.
How many people does CALUMET CITY serve?
CALUMET CITY serves approximately 37,000 people, Illinois. The system provides water to 1 community: Calumet City.
What type of water does CALUMET CITY provide?
CALUMET CITY sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is IL0310390.
How does CALUMET CITY compare to other utilities in Illinois?
CALUMET CITY scores 59/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Illinois state page for a full comparison of water systems.