A81/100
GREEN OAKS — Water Quality Report 2026
Serving 1,470 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0970040
Violations
11
Contaminant Test Results
EPA Violation History
5
Violations (last 5yr)
4
Unresolved
1
Health-Related
TIER 3Unresolved
Disinfection byproduct treatment technique failure
When: August 22, 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 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – September 16, 2025Enforcement: 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: October 17, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Treatment technique violation
When: October 17, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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 GREEN OAKS
Is GREEN OAKS water safe to drink?
GREEN OAKS water receives a grade of A (81/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has GREEN OAKS detected?
1 contaminants were tested in GREEN OAKS's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does GREEN OAKS have any EPA violations?
Yes, GREEN OAKS has 11 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, RPT, TT. 2 are health-based violations.
How many people does GREEN OAKS serve?
GREEN OAKS serves approximately 1,470 people, Illinois. The system provides water to 1 community: Green Oaks.
What type of water does GREEN OAKS provide?
GREEN OAKS 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 IL0970040.
How does GREEN OAKS compare to other utilities in Illinois?
GREEN OAKS scores 81/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Illinois state page for a full comparison of water systems.