A100/100
MARKESAN WATERWORKS — Water Quality Report 2026
Serving 1,365 people · Wisconsin
Water Source
Groundwater
County
—
System ID
WI4240218
Violations
0
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.007 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
This system has a clean compliance history.
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 MARKESAN WATERWORKS
Is MARKESAN WATERWORKS water safe to drink?
MARKESAN WATERWORKS water receives a grade of A (100/100), 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 MARKESAN WATERWORKS detected?
1 contaminants were tested in MARKESAN WATERWORKS's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MARKESAN WATERWORKS have any EPA violations?
No, MARKESAN WATERWORKS has zero EPA violations on record. This indicates consistent compliance with federal drinking water standards.
How many people does MARKESAN WATERWORKS serve?
MARKESAN WATERWORKS serves approximately 1,365 people, Wisconsin. The system provides water to 1 community: Markesan.
What type of water does MARKESAN WATERWORKS provide?
MARKESAN WATERWORKS sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WI4240218.
How does MARKESAN WATERWORKS compare to other utilities in Wisconsin?
MARKESAN WATERWORKS scores 100/100 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.