D39/100
Union Grove Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 4,900 residents · Wisconsin
What's In Union Grove's Tap Water?
31
Contaminants Tested
0
Exceed EPA Limits
1
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
1
Health-Related
TIER 2Resolved
Treatment technique violation
When: October 17, 2024 – June 10, 2025Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Unresolved
Disinfection byproduct treatment technique failure
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
UNION GROVE WATERWORKS
Population Served
4,900
Water Source
Groundwater
System ID
WI2520200
Frequently Asked Questions About Union Grove Water
Is Union Grove tap water safe to drink?
Union Grove, Wisconsin tap water receives a grade of D (39/100), which is considered poor. 0 contaminant(s) exceed EPA maximum contaminant levels and 22 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Union Grove's water?
Of the 31 contaminants tested in Union Grove'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 Union Grove have any water quality violations?
Yes, Union Grove has 22 EPA violation(s) on record, with the most recent in 2024. Violation types include TT, Other, MR. 9 of these are health-based violations, which are the most serious category.
Do I need a water filter in Union Grove?
Union Grove 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 Union Grove's tap water come from?
Union Grove's drinking water is sourced from groundwater and supplied by UNION GROVE WATERWORKS. The system serves approximately 4,900 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Union Grove'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. Union Grove'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 Union Grove's water compare to other cities in Wisconsin?
Union Grove's water quality score of 39/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Wisconsin state page to see how all cities in the state compare.
What should I do if I'm concerned about Union Grove's water quality?
If you have concerns about Union Grove'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 (UNION GROVE 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.