Is Boston, Massachusetts Shower Water Safe? What's In Your Water (2026)
Khat Cruz
Is Boston, Massachusetts Shower Water Safe?
Population: 653,833 · Water Source: Quabbin Reservoir, Wachusett Reservoir
For health-conscious consumers and parents in Boston, Massachusetts, understanding what's in your shower water in 2026 is crucial. While Boston's tap water meets regulatory standards, contaminants like disinfection byproducts and trace metals can still impact skin, hair, and respiratory health, making it important to be informed.
💧 Where Does Boston's Water Come From?
Primary Source: Quabbin Reservoir, Wachusett Reservoir
Boston's water is supplied by the Massachusetts Water Resources Authority (MWRA), drawing from the protected Quabbin and Wachusett Reservoirs. This high-quality source undergoes rigorous treatment, including ozone for primary disinfection, UV light, and chloramination to ensure safety from pathogens.
Treatment: Ozonation, UV light disinfection, Chloramination, Fluoridation, Orthophosphate for corrosion control
🔬 What's In Boston's Shower Water?
Here are the key contaminants detected in Boston's water supply based on real testing data from the EWG Tap Water Database:
| Contaminant | Level Found | EPA Limit | EWG Guideline | Status |
|---|---|---|---|---|
| Haloacetic acids (HAA9) | 16.84 ppb | No federal limit | 0.060 ppb | ⚠️ Exceeds EWG Health Guideline (281x above) |
| Haloacetic acids (HAA5) | 14.72 ppb | 60.0 ppb | 0.100 ppb | ⚠️ Exceeds EWG Health Guideline (147x above) |
| Total trihalomethanes (TTHMs) | 17.18 ppb | 80.0 ppb | 0.150 ppb | ⚠️ Exceeds EWG Health Guideline (115x above) |
| Dichloroacetic acid | 11.00 ppb | No federal limit | 0.200 ppb | ⚠️ Exceeds EWG Health Guideline (55x above) |
| Bromodichloromethane | 3.25 ppb | No federal limit | 0.060 ppb | ⚠️ Exceeds EWG Health Guideline (54x above) |
| Chloroform | 13.13 ppb | No federal limit | 0.400 ppb | ⚠️ Exceeds EWG Health Guideline (33x above) |
| Trichloroacetic acid | 2.02 ppb | No federal limit | 0.100 ppb | ⚠️ Exceeds EWG Health Guideline (20x above) |
| Perfluorooctanoic acid (PFOA) | 0.0000 ppt | 4e-06 ppt | 0.0000 ppt | ⚠️ Exceeds EWG Health Guideline (9x above) |
| Dibromochloromethane | 0.808 ppb | No federal limit | 0.100 ppb | ⚠️ Exceeds EWG Health Guideline (8x above) |
| Perfluorooctane sulfonate (PFOS) | 0.0000 ppt | 4e-06 ppt | 0.0000 ppt | ⚠️ Exceeds EWG Health Guideline (1.5x above) |
Contaminant Details
Haloacetic acids (HAA9)
The health guideline of 0.06 ppb for haloacetic acids (HAA9) was defined by EWG . This health guideline protects against cancer.
Comparison: State average: 22.41 ppb. National average: 23.70 ppb.
Shower Impact: These disinfection byproducts become airborne in hot shower steam. You can inhale and absorb them through your skin, potentially increasing your exposure beyond just drinking water.
Haloacetic acids (HAA5)
The health guideline of 0.1 ppb for haloacetic acids (HAA5) was defined by as . This health guideline protects against cancer.
Comparison: State average: 17.07 ppb. National average: 19.82 ppb.
Shower Impact: These disinfection byproducts become airborne in hot shower steam. You can inhale and absorb them through your skin, potentially increasing your exposure beyond just drinking water.
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.
Comparison: State average: 30.26 ppb. National average: 29.06 ppb.
Shower Impact: These disinfection byproducts become airborne in hot shower steam. You can inhale and absorb them through your skin, potentially increasing your exposure beyond just drinking water.
Dichloroacetic acid
The health guideline of 0.2 ppb for dichloroacetic acid was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Comparison: State average: 8.23 ppb. National average: 8.00 ppb.
Shower Impact: These disinfection byproducts become airborne in hot shower steam. You can inhale and absorb them through your skin, potentially increasing your exposure beyond just drinking water.
Bromodichloromethane
The health guideline of 0.06 ppb for bromodichloromethane was defined by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Comparison: State average: 5.39 ppb. National average: 5.89 ppb.
Shower Impact: These disinfection byproducts become airborne in hot shower steam. You can inhale and absorb them through your skin, potentially increasing your exposure beyond just drinking water.
Chloroform
The health guideline of 0.4 ppb for chloroform was defined by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Comparison: State average: 18.30 ppb. National average: 16.20 ppb.
Shower Impact: These disinfection byproducts become airborne in hot shower steam. You can inhale and absorb them through your skin, potentially increasing your exposure beyond just drinking water.
Trichloroacetic acid
The health guideline of 0.1 ppb for trichloroacetic acid was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Comparison: State average: 7.20 ppb. National average: 6.57 ppb.
Shower Impact: These disinfection byproducts become airborne in hot shower steam. You can inhale and absorb them through your skin, potentially increasing your exposure beyond just drinking water.
Perfluorooctanoic acid (PFOA)
The health guideline of 0.09 ppt for PFOA was defined by 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 Harm to the immune system; harm to fetal growth and child development; increased cholesterol.
Comparison: State average: 0.0000 ppt. National average: 0.0000 ppt.
Shower Impact: Contaminants in shower water can be absorbed through the skin and inhaled as steam, increasing your daily exposure beyond what you get from drinking water alone.
Dibromochloromethane
The health guideline of 0.1 ppb for dibromochloromethane was defined by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Comparison: State average: 2.13 ppb. National average: 3.55 ppb.
Shower Impact: These disinfection byproducts become airborne in hot shower steam. You can inhale and absorb them through your skin, potentially increasing your exposure beyond just drinking water.
Perfluorooctane sulfonate (PFOS)
The health guideline of 0.3 ppt for PFOS 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 cardiovascular harm and harm to fetal growth.
Comparison: State average: 0.0000 ppt. National average: 0.0000 ppt.
Shower Impact: Contaminants in shower water can be absorbed through the skin and inhaled as steam, increasing your daily exposure beyond what you get from drinking water alone.
🧴 How Boston's Water Affects Your Skin, Hair & Health
When you shower, contaminants in the water don't just wash off — they're absorbed through your skin and inhaled as steam. Here's how Boston's water quality may be affecting you:
🧖 Skin Effects
- Dryness and irritation, especially for eczema sufferers, due to chloramine exposure.
- Potential for allergic reactions or rashes from chemical residues.
- Accelerated aging of skin cells from oxidative stress caused by disinfectants.
💇 Hair Effects
- Frizziness, brittleness, and dullness from chloramine stripping natural oils.
- Fading of hair color and chemical treatments.
- Scalp irritation and increased dandruff for sensitive individuals.
🫁 Respiratory Effects
- Irritation of nasal passages and lungs from inhaling volatilized chloramine and disinfection byproducts (TTHMs, HAA5s) in shower steam.
- Exacerbation of asthma or other respiratory conditions.
- Potential for long-term respiratory issues from chronic inhalation of certain chemicals.
✅ What You Can Do About It
Test Your Water
Get a home water test kit or professional analysis to know the exact contaminants and their levels in your specific Boston home's water, as local plumbing can vary.
Install a Quality Shower Filter
A good shower filter can significantly reduce chloramine, disinfection byproducts, and other contaminants, leading to healthier skin, hair, and easier breathing.
Limit Shower Duration and Temperature
Shorter, cooler showers can reduce exposure to volatilized chemicals and minimize skin dryness, as hot water opens pores and releases more steam.
Ventilate Your Bathroom
Ensure good ventilation during and after showering to help dissipate chemical vapors and improve air quality, reducing inhalation risks.
Moisturize Immediately After Showering
Apply a rich moisturizer to damp skin within minutes of showering to lock in hydration and counteract the drying effects of water contaminants.
Protect Your Skin & Hair From Boston's Water
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Related Reading
- why your skin feels dry after showering
- shower water making skin look dull
- why hair feels oily after showering
- nitrate contamination in water
- fluoride effects on skin
Is Boston tap water safe to shower in?
Boston's tap water meets federal safety standards for drinking. However, showering can expose you to contaminants like chloramine and disinfection byproducts through skin absorption and steam inhalation, which may impact sensitive individuals or contribute to long-term health concerns.
Why does my Boston shower water sometimes smell like chlorine?
Boston's water is disinfected with chloramine, a combination of chlorine and ammonia. While generally stable, you might occasionally detect a slight chemical odor, especially in hot showers, as it can volatilize and be more noticeable.
Does Boston's water cause dry skin or hair damage?
Yes, the chloramine used for disinfection in Boston's water can strip natural oils from skin and hair, leading to dryness, irritation, and damage over time. This effect is often more pronounced for individuals with sensitive skin or existing conditions like eczema.
What kind of shower filter is best for Boston water?
For Boston's chloraminated water, look for shower filters specifically designed to remove chloramine, not just chlorine. Filters using KDF media combined with activated carbon are generally effective at reducing both chloramine and disinfection byproducts.
Is hard water a problem in Boston?
No, Boston's MWRA water is generally considered soft to moderately soft. Therefore, hard water mineral buildup and related skin/hair issues are typically not a significant concern for residents, compared to areas with very hard water sources.
