Bryn Mawr, Pennsylvania Tap Water Quality Report
Serving utility: Aqua Pennsylvania Main System
Updated March 2026 • Data from EWG Tap Water Database & EPA SDWIS
High Priority Concerns
Bryn Mawr tap water has 19 contaminants exceeding EWG health guidelines, including Perfluorohexane sulfonate (PFHXS), Haloacetic acids (HAA9), Arsenic. Additionally, 16 known or suspected carcinogens were detected, including Haloacetic acids (HAA9), Arsenic, Haloacetic acids (HAA5).
Water Provider Information
Contaminants Detected
| Contaminant | Detected Level | EWG Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) | 1.15 ppt | 0.00 ppt | 10 ppt | Above guideline |
| Haloacetic acids (HAA9) carcinogen | 32.50 ppb | 0.06 ppb | No legal limit | Above guideline |
| Arsenic carcinogen | 0.87 ppb | 0.00 ppb | 10 ppb | Above guideline |
| Haloacetic acids (HAA5) carcinogen | 21.50 ppb | 0.10 ppb | 60 ppb | Above guideline |
| Total trihalomethanes (TTHMs) carcinogen | 30.90 ppb | 0.15 ppb | 80 ppb | Above guideline |
| Bromodichloromethane carcinogen | 9.57 ppb | 0.06 ppb | No legal limit | Above guideline |
| Trichloroacetic acid carcinogen | 10.60 ppb | 0.10 ppb | No legal limit | Above guideline |
| Perfluorononanoic acid (PFNA) | 0.55 ppt | 0.01 ppt | 10 ppt | Above guideline |
| Dichloroacetic acid carcinogen | 9.87 ppb | 0.20 ppb | No legal limit | Above guideline |
| Chloroform carcinogen | 17.90 ppb | 0.40 ppb | No legal limit | Above guideline |
| Dibromochloromethane carcinogen | 3.19 ppb | 0.10 ppb | No legal limit | Above guideline |
| Perfluorooctanoic acid (PFOA) carcinogen | 2.56 ppt | 0.09 ppt | 4 ppt | Above guideline |
| 1,2,3-Trichloropropane | 0.02 ppb | 0.00 ppb | No legal limit | Above guideline |
| Nitrate carcinogen | 3.41 ppm | 0.14 ppm | 10 ppm | Above guideline |
| Dibromoacetic acid | 0.68 ppb | 0.03 ppb | No legal limit | Above guideline |
| Chromium (hexavalent) carcinogen | 0.28 ppb | 0.02 ppb | No legal limit | Above guideline |
| Tetrachloroethylene (perchloroethylene) | 0.51 ppb | 0.06 ppb | 5 ppb | Above guideline |
| Perfluorooctane sulfonate (PFOS) carcinogen | 0.83 ppt | 0.30 ppt | 4 ppt | Above guideline |
| Radium, combined (-226 and -228) | 0.14 pCi/L | 0.05 pCi/L | 5 pCi/L | Above guideline |
| 1,1-Dichloroethane | 0.01 ppb | 3 ppb | No legal limit | Below guideline |
| 1,4-Dioxane carcinogen | 0.18 ppb | 0.35 ppb | No legal limit | Below guideline |
| Antimony | 0.09 ppb | 1 ppb | 6 ppb | Below guideline |
| Barium | 74.90 ppb | 700 ppb | 2,000 ppb | Below guideline |
| Bromoform carcinogen | 0.21 ppb | 0.50 ppb | No legal limit | Below guideline |
| Chlorate | 119.50 ppb | 210 ppb | No legal limit | Below guideline |
| Chromium (total) | 0.64 ppb | N/A | 100 ppb | Below guideline |
| Cyanide (free) | 1.35 ppb | 150 ppb | No legal limit | Below guideline |
| Fluoride | 0.05 ppm | N/A | 4 ppm | Below guideline |
| Manganese | 2.05 ppb | 100 ppb | No legal limit | Below guideline |
| Molybdenum | 0.59 ppb | 40 ppb | No legal limit | Below guideline |
| Monochloroacetic acid | 0.33 ppb | 53 ppb | No legal limit | Below guideline |
| Perfluorobutane sulfonate (PFBS) | 2.62 ppt | 2,000 ppt | No legal limit | Below guideline |
| Perfluorobutanoic Acid (PFBA) | 1.96 ppt | 1,000 ppt | No legal limit | Below guideline |
| Perfluoroheptanoic acid (PFHPA) | 1.15 ppt | 1,000 ppt | No legal limit | Below guideline |
| Perfluorohexanoic Acid (PFHxA) | 3.95 ppt | 1,000 ppt | No legal limit | Below guideline |
| Perfluoropentanoic Acid (PFPeA) | 4.94 ppt | 1,000 ppt | No legal limit | Below guideline |
| Strontium | 0.16 ppb | 1,500 ppb | No legal limit | Below guideline |
| Trichloroethylene | 0.09 ppb | 0.40 ppb | 5 ppb | Below guideline |
| Uranium carcinogen | 0.05 pCi/L | 0.43 pCi/L | 20 pCi/L | Below guideline |
| Vanadium | 0.46 ppb | 21 ppb | No legal limit | Below guideline |
| cis-1,2-Dichloroethylene | 0.02 ppb | N/A | 70 ppb | Below guideline |
Health Context
Perfluorohexane sulfonate (PFHXS)
Exposure to elevated levels of this contaminant may pose health risks. See EWG and EPA guidelines for more information.
Haloacetic acids (HAA9) carcinogen
Exposure to elevated levels of this contaminant may pose health risks. See EWG and EPA guidelines for more information.
Arsenic carcinogen
Long-term exposure increases risk of skin cancer, bladder cancer, and lung cancer; chronic exposure causes neurological effects and cardiovascular disease.
Haloacetic acids (HAA5) carcinogen
Exposure to elevated levels of this contaminant may pose health risks. See EWG and EPA guidelines for more information.
Total trihalomethanes (TTHMs) carcinogen
Exposure to elevated levels of this contaminant may pose health risks. See EWG and EPA guidelines for more information.
Recommended Filtration for This Water
Echo RO System
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Shop Hydrogen FlaskFrequently Asked Questions
Is Bryn Mawr tap water safe to drink?
Bryn Mawr tap water meets EPA legal standards for drinking water. However, 19 contaminants exceed stricter EWG health guidelines, and 16 known carcinogens were detected. While legally compliant, additional filtration is recommended for optimal safety.
What contaminants are in Bryn Mawr water?
A total of 41 contaminants were detected in Bryn Mawr tap water, including Perfluorohexane sulfonate (PFHXS), Haloacetic acids (HAA9). Of these, 19 exceed EWG health guidelines.
What's the best water filter for Bryn Mawr?
For Bryn Mawr tap water, we recommend a reverse osmosis (RO) system for drinking water — it removes up to 99.9% of contaminants including heavy metals, PFAS, and disinfection byproducts. For shower and bath water, a whole-home filtration system reduces chlorine and volatile organics.
Where does Bryn Mawr get its water?
Bryn Mawr tap water is provided by Aqua Pennsylvania Main System, serving approximately 747,460 people. For detailed source water information, contact your local utility or visit the EPA's SDWIS database.
Nearby City Water Reports
Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)
Last updated: March 2026
Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.
