B66/100
MISSION BROOK SD — Water Quality Report 2026
Serving 2,852 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0315920
Violations
10
Contaminant Test Results
EPA Violation History
2
Violations (last 5yr)
2
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 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
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 MISSION BROOK SD
Is MISSION BROOK SD water safe to drink?
MISSION BROOK SD water receives a grade of B (66/100), which is considered good. Out of 1 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has MISSION BROOK SD detected?
1 contaminants were tested in MISSION BROOK SD's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does MISSION BROOK SD have any EPA violations?
Yes, MISSION BROOK SD has 10 EPA violation(s) on record, with the most recent in 2025. Violation types include RPT, MR, MCL. 6 are health-based violations.
How many people does MISSION BROOK SD serve?
MISSION BROOK SD serves approximately 2,852 people, Illinois.
What type of water does MISSION BROOK SD provide?
MISSION BROOK SD 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 IL0315920.
How does MISSION BROOK SD compare to other utilities in Illinois?
MISSION BROOK SD scores 66/100 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.