A100/100
Markesan Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,365 residents · Wisconsin
What's In Markesan's Tap Water?
1
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
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
Water Utility Details
MARKESAN WATERWORKS
Population Served
1,365
Water Source
Groundwater
System ID
WI4240218
Frequently Asked Questions About Markesan Water
Is Markesan tap water safe to drink?
Markesan, Wisconsin tap water receives a grade of A (100/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Markesan's water?
Of the 1 contaminants tested in Markesan's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Markesan have any water quality violations?
No, Markesan has zero EPA violations on record. This means the water utility has consistently met all federal drinking water standards during the compliance periods tracked by the EPA.
Do I need a water filter in Markesan?
Markesan water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 1 contaminant(s) exceed these stricter goals.
Where does Markesan's tap water come from?
Markesan's drinking water is sourced from groundwater and supplied by MARKESAN WATERWORKS. The system serves approximately 1,365 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Markesan's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Markesan's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Markesan's water compare to other cities in Wisconsin?
Markesan's water quality score of 100/100 earns a grade of A, which is considered excellent. This places Markesan among the better-performing water systems in Wisconsin. Visit our Wisconsin state page to see how all cities in the state compare.
What should I do if I'm concerned about Markesan's water quality?
If you have concerns about Markesan's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (MARKESAN WATERWORKS) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.