A93/100
LAKE DELTON WATERWORKS — Water Quality Report 2026
Serving 2,914 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI1570664
Violations
4
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – August 1, 2025Enforcement: Resolving — corrective action underway
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – August 1, 2025Enforcement: 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 LAKE DELTON WATERWORKS
Is LAKE DELTON WATERWORKS water safe to drink?
LAKE DELTON WATERWORKS water receives a grade of A (93/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has LAKE DELTON WATERWORKS detected?
1 contaminants were tested in LAKE DELTON WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does LAKE DELTON WATERWORKS have any EPA violations?
Yes, LAKE DELTON WATERWORKS has 4 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR.
How many people does LAKE DELTON WATERWORKS serve?
LAKE DELTON WATERWORKS serves approximately 2,914 people, Wisconsin. The system provides water to 1 community: Lake Delton.
What type of water does LAKE DELTON WATERWORKS provide?
LAKE DELTON WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI1570664.
How does LAKE DELTON WATERWORKS compare to other utilities in Wisconsin?
LAKE DELTON WATERWORKS scores 93/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Wisconsin state page for a full comparison of water systems.