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F0/100

CREST HILL — Water Quality Report 2026

Serving 21,169 people · Illinois

Water Source
Groundwater
County
—
System ID
IL1970250
Violations
64

Contaminant Test Results

5 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
Copper (90th percentile)
1.69 mg/L1.30 mg/LOver Limit
PFOA
0.014 µg/L0.004 µg/LOver Limit
PFHxS
0.012 µg/L0.010 µg/LOver Limit
1,4-dioxane
0.410 µg/L—Above Goal
Lead (90th percentile)
< 0.001 mg/L0.015 mg/LAbove Goal

EPA Violation History

15

Violations (last 5yr)

4

Unresolved

1

Health-Related

TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: July 12, 2025Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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 3Resolved

Disinfection byproduct treatment technique failure

When: February 23, 2025 – March 25, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: July 13, 2024 – May 1, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved

Surface water treatment technique failure

When: July 1, 2024Enforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved

Failed to issue ongoing public notification

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

When: July 1, 2024 – December 30, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved

Consumer confidence report — content deficiency

When: January 2, 2024 – February 14, 2025Rule: 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, 2023 – September 30, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed to issue ongoing public notification

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

When: July 1, 2023 – March 11, 2024Rule: 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, 2023 – September 30, 2023Rule: Stage 2 DBPREnforcement: 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: October 1, 2021 – December 9, 2021Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring Violation

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

When: October 1, 2021 – October 31, 2021Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring Violation

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

When: September 1, 2021 – September 30, 2021Rule: Total Coliform 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 30, 2021Rule: Stage 1 DBPREnforcement: 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 CREST HILL

Is CREST HILL water safe to drink?

CREST HILL water receives a grade of F (0/100), which is considered failing. 3 contaminant(s) exceed EPA legal limits and 64 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has CREST HILL detected?

67 contaminants were tested in CREST HILL's water. Notable contaminants include PFOA, Copper (90th percentile), PFHxS, Lead (90th percentile), 1,4-dioxane. 3 exceed EPA legal limits (MCLs). 5 exceed EPA health goals (MCLGs).

Does CREST HILL have any EPA violations?

Yes, CREST HILL has 64 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, RPT, MR. 12 are health-based violations.

How many people does CREST HILL serve?

CREST HILL serves approximately 21,169 people, Illinois. The system provides water to 1 community: Crest Hill.

What type of water does CREST HILL provide?

CREST HILL sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1970250.

How does CREST HILL compare to other utilities in Illinois?

CREST HILL 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

Crest Hill