Fremont
CA

Is Fremont, CA Tap Water Safe to Drink?

Fremont, 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.

3Water systems
5ZIP codes
0%ZIPs above EPA guideline
Metro areaSan Francisco-Oakland-Fremont, CA
Latest data2025-10-06

Where Does Fremont Get Its Water?

Water in Fremont, CA is provided by 3 public water systems: ALAMEDA COUNTY WATER DISTRICT, SAN FRANCISCO REGIONAL WATER SYSTEM and BRYAN CO. RWS & SWMD #2.

How Is Fremont Tap Water Treated?

Treated water is disinfected using calcium hypochlorite and chloramines and free chlorine and ozone. Treatment includes conventional treatment (coagulation, flocculation, and filtration), direct filtration, groundwater disinfection and membrane filtration.

What's in Fremont Tap Water?

The following contaminants were detected most frequently in Fremont public water systems. All detected levels fall at or below EPA health guidelines in this dataset.

ContaminantPeak detectedEPA guidelineZIPs detectedStatus
lithium 9 µg/L — 0 ZIPs Within guideline
PFTrDA 0.007 µg/L — 0 ZIPs Within guideline
8:2 FTS 0.005 µg/L 0.005 µg/L 1 ZIP 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 Fremont

Current EPA monitoring data for Fremont 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.

Waterdrop G3P600 Reverse Osmosis System
Under-sink RO system

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 Fremont Tap Water

Is Fremont tap water safe to drink?

Fremont 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 Fremont tap water?

The most commonly detected contaminants in Fremont water systems include: lithium, PFTrDA, 8:2 FTS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.

Where does Fremont get its drinking water?

Fremont receives water from 3 public water systems, including ALAMEDA COUNTY WATER DISTRICT.

Do I need a water filter in Fremont?

Current data does not show guideline exceedances in Fremont. A certified filter can still reduce trace contaminants and improve taste for households that prefer filtered water.

How often is Fremont tap water tested?

Public water systems in Fremont 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 Fremont

Water utilities serving Fremont, 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.

Modeled boundaries are shown with a dashed outline.

Also covers / overlaps with