Mesa, Arizona Tap Water Quality Report
Serving utility: City of Mesa
Updated March 2026 • Data from EWG Tap Water Database & EPA SDWIS
High Priority Concerns
Mesa tap water has 10 contaminants exceeding EWG health guidelines, including Arsenic, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs). Additionally, 11 known or suspected carcinogens were detected, including Arsenic, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs).
Water Provider Information
Contaminants Detected
| Contaminant | Detected Level | EWG Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Arsenic carcinogen | 4.35 ppb | 0.00 ppb | 10 ppb | Above guideline |
| Haloacetic acids (HAA9) carcinogen | 31.80 ppb | 0.06 ppb | No legal limit | Above guideline |
| Total trihalomethanes (TTHMs) carcinogen | 42.80 ppb | 0.15 ppb | 80 ppb | Above guideline |
| Chromium (hexavalent) carcinogen | 5.63 ppb | 0.02 ppb | No legal limit | Above guideline |
| Perfluorohexane sulfonate (PFHXS) | 0.23 ppt | 0.00 ppt | 10 ppt | Above guideline |
| Haloacetic acids (HAA5) carcinogen | 10.90 ppb | 0.10 ppb | 60 ppb | Above guideline |
| Bromate carcinogen | 4.84 ppb | 0.10 ppb | 10 ppb | Above guideline |
| Nitrate carcinogen | 3.04 ppm | 0.14 ppm | 10 ppm | Above guideline |
| Nitrate and nitrite carcinogen | 2.39 ppm | 0.14 ppm | 10 ppm | Above guideline |
| Chlorite | 209 ppb | 50 ppb | 1,000 ppb | Above guideline |
| 1,2-Dibromo-3-chloropropane (DBCP) | 0.00 ppb | 0.00 ppb | 0.20 ppb | Below guideline |
| 1,4-Dioxane carcinogen | 0.01 ppb | 0.35 ppb | No legal limit | Below guideline |
| Barium | 36.60 ppb | 700 ppb | 2,000 ppb | Below guideline |
| Bromochloromethane | 0.00 ppb | 0.06 ppb | No legal limit | Below guideline |
| Chlorate | 94.80 ppb | 210 ppb | No legal limit | Below guideline |
| Chlorodifluoromethane | 0.00 ppb | N/A | No legal limit | Below guideline |
| Chromium (total) | 6.84 ppb | N/A | 100 ppb | Below guideline |
| Cobalt | 0.01 ppb | 70 ppb | No legal limit | Below guideline |
| Di(2-ethylhexyl) phthalate carcinogen | 0.06 ppb | 3 ppb | 6 ppb | Below guideline |
| Dichloromethane (methylene chloride) carcinogen | 0.01 ppb | 4 ppb | 5 ppb | Below guideline |
| Fluoride | 0.32 ppm | N/A | 4 ppm | Below guideline |
| Germanium | 0.27 ppb | N/A | No legal limit | Below guideline |
| Lithium | 164.80 ppb | N/A | No legal limit | Below guideline |
| Manganese | 1.31 ppb | 100 ppb | No legal limit | Below guideline |
| Molybdenum | 1.62 ppb | 40 ppb | No legal limit | Below guideline |
| Perfluorobutane sulfonate (PFBS) | 0.13 ppt | 2,000 ppt | No legal limit | Below guideline |
| Perfluorohexanoic Acid (PFHxA) | 0.09 ppt | 1,000 ppt | No legal limit | Below guideline |
| Radium, combined (-226 and -228) | 0.03 pCi/L | 0.05 pCi/L | 5 pCi/L | Below guideline |
| Selenium | 1.21 ppb | 30 ppb | 50 ppb | Below guideline |
| Strontium | 0.60 ppb | 1,500 ppb | No legal limit | Below guideline |
| Tetrachloroethylene (perchloroethylene) | 0.02 ppb | 0.06 ppb | 5 ppb | Below guideline |
| Trichloroethylene | 0.01 ppb | 0.40 ppb | 5 ppb | Below guideline |
| Vanadium | 7.50 ppb | 21 ppb | No legal limit | Below guideline |
Health Context
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 (HAA9) 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.
Chromium (hexavalent) carcinogen
Exposure to elevated levels of this contaminant may pose health risks. See EWG and EPA guidelines for more information.
Perfluorohexane sulfonate (PFHXS)
Exposure to elevated levels of this contaminant may pose health risks. See EWG and EPA guidelines for more information.
Recommended Filtration for This Water
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Shop Hydrogen FlaskFrequently Asked Questions
Is Mesa tap water safe to drink?
Mesa tap water meets EPA legal standards for drinking water. However, 10 contaminants exceed stricter EWG health guidelines, and 11 known carcinogens were detected. While legally compliant, additional filtration is recommended for optimal safety.
What contaminants are in Mesa water?
A total of 33 contaminants were detected in Mesa tap water, including Arsenic, Haloacetic acids (HAA9). Of these, 10 exceed EWG health guidelines.
What's the best water filter for Mesa?
For Mesa 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 Mesa get its water?
Mesa tap water is provided by City of Mesa, serving approximately 466,000 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.
