Is Coon Valley, WI Tap Water Safe to Drink?
Graded B+, with 5 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
81.8/100
waterverge.com Coon Valley, WI — Water Quality Report
Coon Valley's drinking water received a grade of B+ (81.8 out of 100), indicating good water quality. The city's 1 water system serves approximately 765 residents using groundwater.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 7 violations on record, including 2 health-based violations. 5 remain unresolved.
What to know about Coon Valley's water
Coon Valley ranks #233 out of 446 cities in Wisconsin for water quality, placing it below average in the state.
Coon Valley relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Coon Valley may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Coon Valley, WI water safe to drink?
Coon Valley's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (81.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 765 residents using groundwater (wells).
Recent water quality updates for Coon Valley
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Coon Valley's water quality assessment. Grade: B+ (81.8/100).
1 health-based. Contaminants: Public Notice, LEAD AND COPPER RULE REVISIONS.
Federal disaster declaration (FEMA DR-4459). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4402). Flood event — may have impacted local water infrastructure.
Contaminants: Consumer Confidence Rule.
1 health-based. Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Coon Valley's water supply.
Well within EPA limits.
Violation history
Coon Valley's water system has 7 total violations on record, including 2 health-based violations. 5 remain unresolved. 2 violations were issued in the last 5 years.
Flood & environmental risk
Vernon County has experienced 8 federally declared disasters since 1969. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Coon Valley's water come from?
Coon Valley's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 765 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Coon Valley residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Coon Valley's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Coon Valley's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Top industrial polluters within 10 miles of Coon Valley
Industrial polluters nearby
Reported releases to surface water by facilities near Coon Valley, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
ATI LADISH LLC COON VALLEY, WI54623 | — | — | 0.5 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Vernon County has experienced 8 federally declared disasters since 1969. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Coon Valley compares by contaminant
Explore where Coon Valley ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Coon Valley's water comes from
Coon Valley's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by local government ownership and serves approximately 765 people through 1 water system.
Water systems serving Coon Valley
| System Name | PWSID | Population | Source |
|---|---|---|---|
| COON VALLEY WATERWORKS | WI6630252 | 765 | GW |
How Coon Valley compares
Full Wisconsin rankings →Coon Valley's score of 81.8/100 is above the average of 65/100 among major Wisconsin cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Wisconsin rankings →About Coon Valley, WI
Wikipedia →Coon Valley is a village in Vernon County, Wisconsin, United States. The population was 758 at the 2020 census. Coon Valley was hit by the floods ravaging Wisconsin in 2018.
Learn more about your water
Guides and resources related to Coon Valley's water quality findings.
Explore water quality across Vernon
Frequently asked questions
Is Coon Valley, WI tap water safe to drink?
Coon Valley's water quality earned a grade of B+ (81.8/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #233 out of 446 cities tested in Wisconsin.
What contaminants are in Coon Valley's water?
Lead was measured at 0.0 ppb (90th percentile). 7 violations are on record.
How is Coon Valley's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Coon Valley?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Coon Valley's water come from?
Coon Valley's water is sourced from Groundwater. The city has 1 water system serving approximately 765 residents.
What health violations has Coon Valley's water system had?
Coon Valley has 2 health-based violations on record. The most recent violation was recorded in October 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 5 violations remain unresolved.
Is Coon Valley's groundwater at risk of contamination?
Coon Valley uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 7 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Coon Valley's water compare to other cities?
Coon Valley ranks #233 out of 446 cities in Wisconsin (better than 48% of state cities) and #7319 out of 15744 cities nationally (54th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Coon Valley's small water system affect quality?
Coon Valley's system serves approximately 765 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 7 violations on record.