Is Sunnyvale, CA Tap Water Safe to Drink?
Sunnyvale, 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 Sunnyvale Get Its Water?
Water in Sunnyvale, CA is provided by 3 public water systems: CITY OF SUNNYVALE, BRYAN CO. RWS & SWMD #2 and CWSC LOS ALTOS SUBURBAN.
How Is Sunnyvale Tap Water Treated?
Treated water is disinfected using free chlorine and calcium hypochlorite and chloramines. Treatment includes conventional treatment (coagulation, flocculation, and filtration), direct filtration, groundwater disinfection and post-ozone biofiltration.
What's in Sunnyvale Tap Water?
The following contaminants were detected most frequently in Sunnyvale 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 |
| 11Cl-PF3OUdS | 0.005 µg/L | — | 0 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 |
Health Risk Profile for Sunnyvale
Current EPA monitoring data for Sunnyvale 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 Sunnyvale Tap Water
Is Sunnyvale tap water safe to drink?
Sunnyvale 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 Sunnyvale tap water?
The most commonly detected contaminants in Sunnyvale water systems include: lithium, PFTrDA, 11Cl-PF3OUdS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Sunnyvale get its drinking water?
Sunnyvale receives water from 3 public water systems, including CITY OF SUNNYVALE.
Do I need a water filter in Sunnyvale?
Current data does not show guideline exceedances in Sunnyvale. A certified filter can still reduce trace contaminants and improve taste for households that prefer filtered water.
How often is Sunnyvale tap water tested?
Public water systems in Sunnyvale 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 2025-10-06.
Tap water reports by ZIP in Sunnyvale
- 94085 - Sylvan Park, Sunnyvale tap water report Some concern
- 94086 - Sylvan Park, Sunnyvale tap water report Some concern
- 94087 - Waverly Park, Sunnyvale tap water report Some concern
- 94089 - Alviso, Sunnyvale tap water report Some concern
Water utilities serving Sunnyvale, 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 SUNNYVALESome concern
- CWSC LOS ALTOS SUBURBANSome concern
- SANTA CLARA VALLEY WATER DISTRICTNo recent federal sampling
Also covers / overlaps with
- San Jose CCD, CA · Township