Stockton, California Tap Water Quality Report
Serving utility: Stockton East Water District
Updated March 2026 • Data from EWG Tap Water Database & EPA SDWIS
Notable Concerns
Stockton tap water has 6 contaminants exceeding EWG health guidelines, including Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Arsenic. Additionally, 6 known or suspected carcinogens were detected, including Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Arsenic.
Water Provider Information
Contaminants Detected
| Contaminant | Detected Level | EWG Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Total trihalomethanes (TTHMs) carcinogen | 64.30 ppb | 0.15 ppb | 80 ppb | Above guideline |
| Haloacetic acids (HAA5) carcinogen | 24.30 ppb | 0.10 ppb | 60 ppb | Above guideline |
| Arsenic carcinogen | 0.40 ppb | 0.00 ppb | 10 ppb | Above guideline |
| Nitrate carcinogen | 0.97 ppm | 0.14 ppm | 10 ppm | Above guideline |
| Nitrate and nitrite carcinogen | 0.62 ppm | 0.14 ppm | 10 ppm | Above guideline |
| Uranium carcinogen | 1.12 pCi/L | 0.43 pCi/L | 20 pCi/L | Above guideline |
| 1,2,3-Trichloropropane | 0.00 ppb | 0.00 ppb | No legal limit | Below guideline |
| Aluminum | 10.90 ppb | 600 ppb | No legal limit | Below guideline |
| Barium | 22.10 ppb | 700 ppb | 2,000 ppb | Below guideline |
| Fluoride | 0.01 ppm | N/A | 4 ppm | Below guideline |
| Manganese | 3.29 ppb | 100 ppb | No legal limit | Below guideline |
| Vanadium | 2.95 ppb | 21 ppb | No legal limit | Below guideline |
Health Context
Total trihalomethanes (TTHMs) carcinogen
Exposure to elevated levels of this contaminant may pose health risks. See EWG and EPA guidelines for more information.
Haloacetic acids (HAA5) 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.
Nitrate carcinogen
Nitrate is converted to nitrite in the body, which can interfere with oxygen transport in blood. Chronic exposure is linked to increased cancer risk.
Nitrate and nitrite 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
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Shop Hydrogen FlaskFrequently Asked Questions
Is Stockton tap water safe to drink?
Stockton tap water meets EPA legal standards for drinking water. However, 6 contaminants exceed stricter EWG health guidelines, and 6 known carcinogens were detected. While legally compliant, additional filtration is recommended for optimal safety.
What contaminants are in Stockton water?
A total of 12 contaminants were detected in Stockton tap water, including Total trihalomethanes (TTHMs), Haloacetic acids (HAA5). Of these, 6 exceed EWG health guidelines.
What's the best water filter for Stockton?
For Stockton 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 Stockton get its water?
Stockton tap water is provided by Stockton East Water District, serving approximately 364,624 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.
