🚿 Wisconsin Shower Water Quality Report (2026)
Comprehensive analysis of Wisconsin water quality across 2 cities • Based on real EWG testing data • Updated 2026
If you live in Wisconsin, you may be showering in water that contains contaminants exceeding health guidelines — and you might not even know it. Our analysis of water quality data across 2 Wisconsin cities reveals 8 contaminants that may exceed EWG health guidelines.
Wisconsin faces unique water quality challenges including PFAS contamination and agricultural nitrates. Whether you're in Madison or elsewhere in the state, understanding what's in your shower water is the first step toward protecting your skin and hair.
📊 Wisconsin Water Quality at a Glance
Across Wisconsin, we analyzed water quality data from the Environmental Working Group (EWG) database. The results show that Wisconsin residents may be exposed to a range of contaminants through their shower water — many at levels that exceed health guidelines set by the EWG, which are often stricter than federal legal limits.
⚠️ Top Contaminants Found in Wisconsin Water
Based on EWG data analysis, here are the most significant contaminants detected in Wisconsin water supplies:
| Contaminant | Avg. Level | EWG Guideline | Status |
|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) | 0.0001 ppt | 0.0000 ppt | ⚠️ 57403.5x above |
| Total PFOS and PFOA | 0.0000 ppt | 0.0000 ppt | ⚠️ 1132.1x above |
| Haloacetic acids (HAA9) | 19.80 ppb | 0.0600 ppb | ⚠️ 330.0x above |
| Total trihalomethanes (TTHMs) | 30.85 ppb | 0.1500 ppb | ⚠️ 205.7x above |
| Arsenic | 0.7200 ppb | 0.0040 ppb | ⚠️ 180.0x above |
| Radon | 223.0000 pCi/L | 1.5000 pCi/L | ⚠️ 148.7x above |
| Bromodichloromethane | 7.78 ppb | 0.0600 ppb | ⚠️ 129.7x above |
| Haloacetic acids (HAA5) | 12.15 ppb | 0.1000 ppb | ⚠️ 121.5x above |
Perfluorohexane sulfonate (PFHXS)
The health guideline of 0.001 ppt for perfluorohexane sulfonate was defined by EWG based on studies by Phillipe Grandjean of Harvard University and many other independent researchers who found reduced effectiveness of vaccines and adverse impacts on mammary gland development from exposure to PFOA and PFOS, the two PFAS most widely detected in drinking water. This health guideline harm to the developing immune system.
National Average: 0.0000 ppt | Wisconsin Average: 0.0001 ppt
Total PFOS and PFOA
The health guideline of 0.007 ppt for total PFOS and PFOA was defined by EWG as based on studies by Phillipe Grandjean of Harvard University and many other independent researchers who found reduced effectiveness of vaccines and adverse impacts on mammary gland development from exposure to PFOA and PFOS, the two PFAS most widely detected in drinking water. This health guideline protects against cancer.
National Average: 0.0000 ppt | Wisconsin Average: 0.0000 ppt
Haloacetic acids (HAA9)
The health guideline of 0.06 ppb for haloacetic acids (HAA9) was defined by EWG . This health guideline protects against cancer.
National Average: 23.70 ppb | Wisconsin Average: 19.80 ppb
Total trihalomethanes (TTHMs)
The health guideline of 0.15 ppb for trihalomethanes was defined by in a peer-reviewed scientific study by EWG and represents a one-in-one-million lifetime cancer risk level. as a draft public health goal, the level of drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
National Average: 29.06 ppb | Wisconsin Average: 30.85 ppb
🏙️ City-by-City Water Quality in Wisconsin
We've analyzed water quality in 2 Wisconsin cities. Click on any city to see its detailed water quality report:
| City | Contaminants Found | Above EWG Guidelines |
|---|---|---|
| Madison | 77 | 29 |
| Milwaukee | 47 | 21 |
🩺 Health Effects of Wisconsin Water Contaminants
The contaminants found in Wisconsin water may be associated with various health concerns. When you shower, your skin — your body's largest organ — can absorb these substances, and you may inhale steam containing volatile compounds.
🧴 Skin & Hair
🫁 Respiratory
- Steam inhalation of chlorine/VOCs
- May aggravate asthma symptoms
- Potential respiratory irritation
⚕️ Long-Term Concerns
- Disinfection byproduct exposure
- Eczema flare-ups
- Cumulative contaminant absorption
🛡️ How to Protect Yourself from Wisconsin Water Contaminants
The good news: you don't have to accept whatever comes out of your Wisconsin showerhead. A quality shower filter can significantly reduce many of the contaminants found in your water.
Key contaminants a shower filter can help address:
- Haloacetic acids (HAA9) — learn about health effects and removal
- Total trihalomethanes (TTHMs) — learn about health effects and removal
- Arsenic — learn about health effects and removal
- Radon — learn about health effects and removal
Additionally, understanding common symptoms can help you identify water quality issues:
💧 Recommended Shower Filtration for Wisconsin
Based on Wisconsin's water quality profile, we recommend a multi-stage filtration system. Afina's shower filters use KDF-55 and activated carbon to target chlorine, heavy metals, and other common contaminants found in Wisconsin water.
Afina Filtered Showerhead
Multi-stage filter built right into a high-pressure showerhead. No adapters needed.
Shop Now →Afina Shower Filter
Attach between your pipe and any showerhead. KDF-55 + activated carbon filtration.
Shop Now →Replacement Filter
Keep your filtration fresh. Replace every 2-3 months for optimal contaminant removal.
Shop Now →❓ Frequently Asked Questions
Is Wisconsin tap water safe to shower in?
While Wisconsin tap water meets federal legal standards (MCLs), our analysis found 8 contaminants exceeding stricter EWG health guidelines. Federal limits don't always reflect the latest health research, so many health-conscious residents choose to add shower filtration for an extra layer of protection.
What contaminants are in Wisconsin water?
Based on EWG data, Wisconsin water contains up to 81 detected contaminants. The most notable include Perfluorohexane sulfonate (PFHXS), Total PFOS and PFOA, Haloacetic acids (HAA9). Wisconsin faces specific challenges with PFAS contamination and agricultural nitrates.
Does Wisconsin have hard water?
Yes, Wisconsin generally has very hard water. High mineral content including calcium and magnesium can cause buildup on fixtures, dry skin, and hair damage.
Do I need a shower filter in Wisconsin?
Given that Wisconsin water contains contaminants above EWG health guidelines, a shower filter may help reduce your exposure to chlorine, heavy metals, and disinfection byproducts. This is especially important if you experience dry skin, itchy scalp, or hair issues after showering.
How does Wisconsin water compare to the national average?
Wisconsin is in the Upper Midwest region and faces water quality challenges common to the area, including PFAS contamination and agricultural nitrates. Some contaminants may be above national averages depending on your specific city and water source.
Data sourced from the Environmental Working Group (EWG) Tap Water Database. This report is for informational purposes only and does not constitute medical advice. Water quality can vary by neighborhood and season. Last updated: March 2026.
