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F0/100

ROCKDALE — Water Quality Report 2026

Serving 2,012 people · Illinois

Water Source
Groundwater
County
—
System ID
IL1970850
Violations
60

Contaminant Test Results

2 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
Copper (90th percentile)
1.36 mg/L1.30 mg/LOver Limit
Lead (90th percentile)
0.013 mg/L0.015 mg/LAbove Goal

EPA Violation History

13

Violations (last 5yr)

7

Unresolved

0

Health-Related

TIER 3Unresolved

Surface water treatment technique failure

When: July 1, 2025Verify on EPA.gov
TIER 3Unresolved

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, 2025 – September 30, 2025Verify on EPA.gov
TIER 3Resolved

Disinfection byproduct treatment technique failure

When: October 11, 2024 – November 30, 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 3Unresolved

Surface water treatment technique failure

When: July 1, 2023Enforcement: Informal — resolved cooperativelyVerify on EPA.gov
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, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway
TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: April 20, 2023Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Unresolved

Monitoring / Reporting Violation

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

When: September 29, 2022Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2022 – August 4, 2022Enforcement: Resolving — corrective action underway
TIER 3Unresolved

Disinfection byproduct treatment technique failure

When: January 13, 2022Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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: January 1, 2022 – March 31, 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: October 1, 2021 – December 31, 2021Enforcement: Resolving — corrective action underway
TIER 3Resolved

Surface water treatment technique failure

When: July 1, 2021 – July 26, 2021Enforcement: 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 ROCKDALE

Is ROCKDALE water safe to drink?

ROCKDALE water receives a grade of F (0/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 60 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has ROCKDALE detected?

2 contaminants were tested in ROCKDALE's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).

Does ROCKDALE have any EPA violations?

Yes, ROCKDALE has 60 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MCL. 36 are health-based violations.

How many people does ROCKDALE serve?

ROCKDALE serves approximately 2,012 people, Illinois. The system provides water to 1 community: Rockdale.

What type of water does ROCKDALE provide?

ROCKDALE sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IL1970850.

How does ROCKDALE compare to other utilities in Illinois?

ROCKDALE 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

Rockdale