Is Hayward, CA Tap Water Safe to Drink?
Hayward, CA tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Contaminants including lithium have been detected at or below guideline thresholds.
Where Does Hayward Get Its Water?
Water in Hayward, CA is provided by 3 public water systems: CITY OF HAYWARD, ALAMEDA COUNTY WATER DISTRICT and EAST BAY MUD.
How Is Hayward Tap Water Treated?
Treated water is disinfected using calcium hypochlorite and free chlorine and ozone. Treatment includes air stripping, conventional treatment (coagulation, flocculation, and filtration), direct filtration, groundwater disinfection, in-line filtration, membrane filtration and post-ozone biofiltration.
What's in Hayward Tap Water?
The following contaminants were detected most frequently in Hayward public water systems. All detected levels fall at or below EPA health guidelines in this dataset.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 9 µg/L | — | 0 ZIPs | Within guideline |
| PFTrDA | 0.007 µg/L | 0.007 µg/L | 4 ZIPs | Within guideline |
| 8:2 FTS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| 6:2 FTS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| PFBA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Hayward
Current EPA monitoring data for Hayward shows contaminant levels within guideline thresholds across all ZIP codes in this dataset. As with all public water systems, sensitive populations may choose to use a certified filter for additional peace of mind.
Best Broad-Spectrum Filters for This Water Profile
This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.
8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.
See recommendations matched to your exact address: choose your ZIP code below.
Frequently Asked Questions about Hayward Tap Water
Is Hayward tap water safe to drink?
Hayward tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Sensitive populations may still choose to use a certified filter as a precaution.
What contaminants are in Hayward tap water?
The most commonly detected contaminants in Hayward water systems include: lithium, PFTrDA, 8:2 FTS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Hayward get its drinking water?
Hayward receives water from 3 public water systems, including CITY OF HAYWARD.
Do I need a water filter in Hayward?
Current data does not show guideline exceedances in Hayward. A certified filter can still reduce trace contaminants and improve taste for households that prefer filtered water.
How often is Hayward tap water tested?
Public water systems in Hayward are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-10-02.
Tap water reports by ZIP in Hayward
- 94541 - Upper B Street, Hayward tap water report Some concern
- 94542 - Hayward Highland, Hayward tap water report Some concern
- 94543 - Hayward tap water report Some concern
- 94544 - Carpenter, Hayward tap water report Some concern
- 94545 - Russell City, Hayward tap water report Some concern
Water utilities serving Hayward, CA
Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.
- CITY OF HAYWARDSome concern
Also covers / overlaps with
- Hayward CCD, CA · Township
- Fairview, CA · CDP
- Cherryland, CA · CDP
- San Lorenzo, CA · CDP