B67/100
LEYDEN TWSP WATER DISTRICT — Water Quality Report 2026
Serving 10,000 people · Illinois
Water Source
Purchased Surface Water
County
—
System ID
IL0315880
Violations
18
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.013 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Failed to issue ongoing public notification
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2021 – August 31, 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 LEYDEN TWSP WATER DISTRICT
Is LEYDEN TWSP WATER DISTRICT water safe to drink?
LEYDEN TWSP WATER DISTRICT water receives a grade of B (67/100), which is considered good. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has LEYDEN TWSP WATER DISTRICT detected?
69 contaminants were tested in LEYDEN TWSP WATER DISTRICT's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does LEYDEN TWSP WATER DISTRICT have any EPA violations?
Yes, LEYDEN TWSP WATER DISTRICT has 18 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, Other, MCL. 3 are health-based violations.
How many people does LEYDEN TWSP WATER DISTRICT serve?
LEYDEN TWSP WATER DISTRICT serves approximately 10,000 people, Illinois.
What type of water does LEYDEN TWSP WATER DISTRICT provide?
LEYDEN TWSP WATER DISTRICT 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 IL0315880.
How does LEYDEN TWSP WATER DISTRICT compare to other utilities in Illinois?
LEYDEN TWSP WATER DISTRICT scores 67/100 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.