Water Quality in Coon Valley, WI: 2 Violations - Grade C
Grade C · Score 69/100 · 3 water systems · Updated 2026-07-18
Coon Valley's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-07-18
Reviewing EPA compliance files for Coon Valley, WI surfaces 2 documented water violations - each categorized by violation type and linked to the utility that drew the federal citation.
Water Quality by ZIP Code in Coon Valley
Coon Valley is covered by a single ZIP code, so one water-quality profile applies citywide. See the contaminant data below.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 54623 | C | 69 | 2 | 1 | View report → |
Water Quality Overview
Coon Valley, Wisconsin receives a water quality grade of C with an overall score of 69 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 3 water systems serving Coon Valley have accumulated 2 EPA violations, including 1 health-based violation. These violations are tracked across 1 ZIP code serving approximately 1,949 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Coon Valley's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
The average 90th percentile lead level across Coon Valley water systems is 0.0029 mg/L - within EPA limits. No ZIP codes exceed the EPA lead action level.
With 64% of homes built before 1986, Coon Valley has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Radon Risk
Coon Valley is in EPA Radon Zone 1 (High risk). The EPA recommends all homes in Zone 1 areas be tested for radon. Radon is the second leading cause of lung cancer after smoking.
Water Systems Serving Coon Valley
Coon Valley is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 1,949 people across 1 ZIP code.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 10 enforcement actions against water systems serving Coon Valley. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Coon Valley
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Coon Valley Water Systems
The following contaminants have been detected or caused violations across Coon Valley's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Stage 2 DBP Rule | Treatment Technique | N/A | 1 | 1 | Yes |
| Lead and Copper Rule | Treatment Technique | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Coon Valley. Recent actions:
| Date | Action Type |
|---|---|
| 2025-05-02 | State Order Extension |
| 2023-04-01 | State Order Extension |
| 2023-04-01 | State Informal Action |
| 2021-06-30 | State Informal Action |
| 2021-06-25 | State Informal Action |
| 2021-06-25 | State Order Extension |
| 2021-03-12 | State Informal Action |
| 2021-02-11 | State Order Extension |
| 2021-02-05 | State Informal Action |
| 2021-02-05 | State Informal Enforcement |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-05-02.
Coon Valley vs. Nearby Wisconsin Cities
How Coon Valley's water quality compares to similar cities in Wisconsin:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Coon Valley | C | 2 | 3 | 1,949 |
| Merrimac | B | 3 | 3 | 1,954 |
| Fairchild | B | 4 | 1 | 1,960 |
| Somers | B | 3 | 1 | 1,930 |
Common Questions About Coon Valley Water
These are the most common questions residents search for about water quality in Coon Valley, Wisconsin:
Is Coon Valley water hard or soft? Water hardness varies by source. Coon Valley's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Coon Valley tap water? Coon Valley's water receives a grade of C (69/100). There are 1 health-based violation - consider filtration.
What is the best water filter for Coon Valley? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Coon Valley vs. Wisconsin Average
Understanding how Coon Valley compares to the broader Wisconsin average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Coon Valley.
ZIP Codes in Coon Valley
Coon Valley spans 1 ZIP code. The ZIP with the lowest water quality score is 54623. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.