Last updated: April 2026.
🚿 Montana Shower Water Quality Report (2026)
Comprehensive analysis of Montana water quality across 1 city • Based on real EWG testing data • Updated 2026
If you live in Montana, 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 1 Montana city reveals 8 contaminants that may exceed EWG health guidelines.
Montana faces unique water quality challenges including mining runoff and naturally occurring arsenic. Whether you're in Helena or elsewhere in the state, understanding what's in your shower water is the first step toward protecting your skin and hair.
📊 Montana Water Quality at a Glance
Across Montana, we analyzed water quality data from the Environmental Working Group (EWG) database. The results show that Montana 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 Montana Water
Based on EWG data analysis, here are the most significant contaminants detected in Montana water supplies:
| Contaminant | Avg. Level | EWG Guideline | Status |
|---|---|---|---|
| Arsenic | 12.38 ppb | 0.0040 ppb | ⚠️ 3096.2x above |
| 1,2,3-Trichloropropane | 0.7350 ppb | 0.0007 ppb | ⚠️ 1050.0x above |
| Haloacetic acids (HAA9) | 44.13 ppb | 0.0600 ppb | ⚠️ 735.6x above |
| Haloacetic acids (HAA5) | 53.83 ppb | 0.1000 ppb | ⚠️ 538.3x above |
| Total trihalomethanes (TTHMs) | 46.00 ppb | 0.1500 ppb | ⚠️ 306.7x above |
| Trichloroacetic acid | 27.33 ppb | 0.1000 ppb | ⚠️ 273.3x above |
| Dichloroacetic acid | 21.50 ppb | 0.2000 ppb | ⚠️ 107.5x above |
| Chloroform | 42.50 ppb | 0.4000 ppb | ⚠️ 106.2x above |
Arsenic
The health guideline of 0.004 ppb for arsenic was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
National Average: 0.6242 ppb | Montana Average: 12.38 ppb
1,2,3-Trichloropropane
The health guideline of 0.0007 ppb for 1,2,3-trichloropropane was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
National Average: 0.0004 ppb | Montana Average: 0.7350 ppb
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 | Montana Average: 44.13 ppb
Haloacetic acids (HAA5)
The health guideline of 0.1 ppb for haloacetic acids (HAA5) was established. This health guideline protects against cancer.
National Average: 19.82 ppb | Montana Average: 53.83 ppb
🏙️ City-by-City Water Quality in Montana
We've analyzed water quality in 1 Montana city. Click on any city to see its detailed water quality report:
| City | Contaminants Found | Above EWG Guidelines |
|---|---|---|
| Helena | 37 | 17 |
🩺 Health Effects of Montana Water Contaminants
The contaminants found in Montana 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 Montana Water Contaminants
The good news: you don't have to accept whatever comes out of your Montana showerhead. A quality shower filter can significantly reduce many of the contaminants found in your water.
Key contaminants a shower filter can help address:
- Arsenic — learn about health effects and removal
- Haloacetic acids (HAA9) — learn about health effects and removal
- Total trihalomethanes (TTHMs) — learn about health effects and removal
- Chlorine — learn about health effects and removal
Additionally, understanding common symptoms can help you identify water quality issues:
💧 Recommended Shower Filtration for Montana
Based on Montana'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 Montana 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 Montana tap water safe to shower in?
While Montana 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 Montana water?
Based on EWG data, Montana water contains up to 37 detected contaminants. The most notable include Arsenic, 1,2,3-Trichloropropane, Haloacetic acids (HAA9). Montana faces specific challenges with mining runoff and naturally occurring arsenic.
Does Montana have hard water?
Many areas in Montana have hard water. Mineral content varies by region but may contribute to dry skin, buildup on fixtures, and hair issues.
Do I need a shower filter in Montana?
Given that Montana 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 Montana water compare to the national average?
Montana is in the Mountain West region and faces water quality challenges common to the area, including mining runoff and naturally occurring arsenic. 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.
