Tucson, Arizona Tap Water Quality Report
Serving utility: City of Tucson
Updated March 2026 • Data from EWG Tap Water Database & EPA SDWIS
High Priority Concerns
Tucson tap water has 12 contaminants exceeding EWG health guidelines, including Arsenic, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs). Additionally, 13 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 | 2.04 ppb | 0.00 ppb | 10 ppb | Above guideline |
| Haloacetic acids (HAA9) carcinogen | 3.93 ppb | 0.06 ppb | No legal limit | Above guideline |
| Total trihalomethanes (TTHMs) carcinogen | 9.39 ppb | 0.15 ppb | 80 ppb | Above guideline |
| Dibromochloromethane carcinogen | 3.52 ppb | 0.10 ppb | No legal limit | Above guideline |
| Bromodichloromethane carcinogen | 1.94 ppb | 0.06 ppb | No legal limit | Above guideline |
| Chromium (hexavalent) carcinogen | 0.65 ppb | 0.02 ppb | No legal limit | Above guideline |
| Nitrate carcinogen | 1.68 ppm | 0.14 ppm | 10 ppm | Above guideline |
| Bromoform carcinogen | 3.36 ppb | 0.50 ppb | No legal limit | Above guideline |
| Haloacetic acids (HAA5) carcinogen | 0.62 ppb | 0.10 ppb | 60 ppb | Above guideline |
| Uranium carcinogen | 2.23 pCi/L | 0.43 pCi/L | 20 pCi/L | Above guideline |
| Chloroform carcinogen | 0.58 ppb | 0.40 ppb | No legal limit | Above guideline |
| Radium, combined (-226 and -228) | 0.07 pCi/L | 0.05 pCi/L | 5 pCi/L | Above guideline |
| 1,4-Dioxane carcinogen | 0.00 ppb | 0.35 ppb | No legal limit | Below guideline |
| Atrazine | 0.00 ppb | 0.10 ppb | 3 ppb | Below guideline |
| Barium | 58.40 ppb | 700 ppb | 2,000 ppb | Below guideline |
| Chlorate | 108.80 ppb | 210 ppb | No legal limit | Below guideline |
| Chlorodifluoromethane | 0.00 ppb | N/A | No legal limit | Below guideline |
| Cyanide | 0.05 ppb | N/A | 200 ppb | Below guideline |
| Endothall | 0.06 ppb | 94 ppb | 100 ppb | Below guideline |
| Ethylbenzene carcinogen | 0.05 ppb | 300 ppb | 700 ppb | Below guideline |
| Fluoride | 0.33 ppm | N/A | 4 ppm | Below guideline |
| Germanium | 0.19 ppb | N/A | No legal limit | Below guideline |
| Lithium | 15.70 ppb | N/A | No legal limit | Below guideline |
| Manganese | 2.60 ppb | 100 ppb | No legal limit | Below guideline |
| Molybdenum | 3.08 ppb | 40 ppb | No legal limit | Below guideline |
| Selenium | 0.31 ppb | 30 ppb | 50 ppb | Below guideline |
| Strontium | 0.88 ppb | 1,500 ppb | No legal limit | Below guideline |
| Toluene | 0.01 ppb | 150 ppb | 1,000 ppb | Below guideline |
| Trichloroethylene | 0.02 ppb | 0.40 ppb | 5 ppb | Below guideline |
| Vanadium | 6.64 ppb | 21 ppb | No legal limit | Below guideline |
| Xylenes (total) | 0.47 ppb | 1,800 ppb | 10,000 ppb | Below guideline |
| o-toluidine | 0.00 ppb | N/A | 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.
Dibromochloromethane carcinogen
Dibromochloromethane is a trihalomethane (THM) that may increase cancer risk and cause liver and kidney damage with chronic exposure at elevated levels.
Bromodichloromethane carcinogen
Bromodichloromethane is a trihalomethane (THM) disinfection byproduct that damages liver and kidneys with chronic exposure. EPA classifies it as a probable human carcinogen based on animal carcinogenicity data.
Recommended Filtration for This Water
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Shop Hydrogen FlaskFrequently Asked Questions
Is Tucson tap water safe to drink?
Tucson tap water meets EPA legal standards for drinking water. However, 12 contaminants exceed stricter EWG health guidelines, and 13 known carcinogens were detected. While legally compliant, additional filtration is recommended for optimal safety.
What contaminants are in Tucson water?
A total of 32 contaminants were detected in Tucson tap water, including Arsenic, Haloacetic acids (HAA9). Of these, 12 exceed EWG health guidelines.
What's the best water filter for Tucson?
For Tucson 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 Tucson get its water?
Tucson tap water is provided by City of Tucson, serving approximately 732,906 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.
