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F0/100

COAL CITY — Water Quality Report 2026

Serving 5,749 people · Illinois

Water Source
Groundwater
County
—
System ID
IL0630200
Violations
164

Contaminant Test Results

EPA Violation History

12

Violations (last 5yr)

3

Unresolved

2

Health-Related

TIER 3Resolved

Disinfection byproduct treatment technique failure

When: September 1, 2025 – September 3, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved

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: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Unresolved

Surface water treatment technique failure

When: July 1, 2025Enforcement: Informal — resolved cooperativelyVerify on EPA.gov
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, 2024 – December 5, 2024Enforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: January 18, 2022 – April 20, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: October 14, 2021 – March 3, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: October 14, 2021 – March 3, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2021 – September 17, 2021Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 2Resolved

Exceeded the Maximum Contaminant Level (running average)

When: July 1, 2021 – September 30, 2021Enforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: May 26, 2021 – May 28, 2021Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: May 5, 2021 – May 28, 2021Rule: Ground Water RuleEnforcement: 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 COAL CITY

Is COAL CITY water safe to drink?

COAL CITY water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 164 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has COAL CITY detected?

31 contaminants were tested in COAL CITY's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.

Does COAL CITY have any EPA violations?

Yes, COAL CITY has 164 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, RPT, TT. 19 are health-based violations.

How many people does COAL CITY serve?

COAL CITY serves approximately 5,749 people, Illinois. The system provides water to 1 community: Coal City.

What type of water does COAL CITY provide?

COAL CITY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL0630200.

How does COAL CITY compare to other utilities in Illinois?

COAL CITY 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.

Cities Served

Coal City