B78/100
STONE PARK — Water Quality Report 2026
Serving 4,576 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0313030
Violations
11
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.004 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
0
Health-Related
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 3Resolved
Surface water treatment technique failure
When: July 1, 2021 – July 19, 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 STONE PARK
Is STONE PARK water safe to drink?
STONE PARK water receives a grade of B (78/100), which is considered good. Out of 31 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has STONE PARK detected?
31 contaminants were tested in STONE PARK's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does STONE PARK have any EPA violations?
Yes, STONE PARK has 11 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, Other, MR. 2 are health-based violations.
How many people does STONE PARK serve?
STONE PARK serves approximately 4,576 people, Illinois. The system provides water to 1 community: Stone Park.
What type of water does STONE PARK provide?
STONE PARK 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 IL0313030.
How does STONE PARK compare to other utilities in Illinois?
STONE PARK scores 78/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Illinois state page for a full comparison of water systems.