Fremont, CA

CITY OF PLEASANTON

Is tap water in Fremont (ZIP 94537) safe to drink?

Q: What's in ZIP 94537 tap water?

ZIP 94537 did not show contaminants above EPA health guidelines in the latest available dataset. The full table on this page lists every compound that was tested.

Q: Who provides tap water in ZIP 94537?

Public records identify CITY OF PLEASANTON as a primary water system associated with ZIP 94537. Service boundaries can vary by address, so confirm exact service with the utility.

Q: When was ZIP 94537 tap water last tested?

The most recent test date used in this report is October 2024. EnviroClarity last refreshed this page on 2026-05-04.

Q: Where can I find the official water quality report for ZIP 94537?

Every U.S. public water system is required to publish an annual Consumer Confidence Report (CCR). Contact CITY OF PLEASANTON or visit their website for the latest official report covering ZIP 94537. The EPA also maintains a national CCR locator.

Q: Do I still need a water filter in ZIP 94537?

Even when EPA-tracked compounds are within limits, some households use a certified filter for taste, odor, or to add a margin against trace contaminants below the reporting limit. Match any filter's certifications (NSF/ANSI 42, 53, 58, or P473) to the specific compounds you care about.

Source: Official EPA UCMR5 federal monitoring data. Last tested October 2024.

The short answer for Fremont (ZIP 94537)

Fremont tap water tested within EPA guidelines across all compounds checked (tested October 2024). See the complete test results, measurements, and what was tested.

The health risk for Fremont

Your water system was tested for chemical contaminants. No exceedances were detected in the most recent test period.

All tested compounds were below lab detection limits.

PFAS & other tested compounds (parts per trillion (ppt)) October 2024

0 EPA limit Not detected

Not detected

Detected

measurement

Below detection limit

EPA limit

guideline

Below limit

Comparison

vs. guideline

EPA limit: Below detection limit | Your water: Not detected

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Most elevated compounds

No compounds above or close to EPA limits in available data.

View all tested compounds

Blending Facility S1 · Tested: October 2024

Compound	Measurement	EPA Limit	Comparison
lithium	<9.000 µg/L	10 µg/L	Below limit
PFHxS	<0.003 µg/L	0.004 µg/L	Below limit
HFPO-DA	<0.005 µg/L	0.01 µg/L	Below limit
PFNA	<0.004 µg/L	0.01 µg/L	Below limit
PFHxA	<0.003 µg/L	3 µg/L	Below limit
PFBA	<0.005 µg/L	6 µg/L	Below limit
11Cl-PF3OUdS	<0.005 µg/L	0.005 µg/L	Below limit
4:2 FTS	<0.003 µg/L	0.003 µg/L	Below limit
6:2 FTS	<0.005 µg/L	0.005 µg/L	Below limit
8:2 FTS	<0.005 µg/L	0.005 µg/L	Below limit
9Cl-PF3ONS	<0.002 µg/L	0.002 µg/L	Below limit
ADONA	<0.003 µg/L	0.003 µg/L	Below limit
PFBS	<0.003 µg/L	0.003 µg/L	Below limit
PFDA	<0.003 µg/L	0.003 µg/L	Below limit
PFDoA	<0.003 µg/L	0.003 µg/L	Below limit
PFHpA	<0.003 µg/L	0.003 µg/L	Below limit
PFHpS	<0.003 µg/L	0.003 µg/L	Below limit
PFOA	<0.004 µg/L	0.004 µg/L	Below limit
PFOS	<0.004 µg/L	0.004 µg/L	Below limit
PFPeA	<0.003 µg/L	0.003 µg/L	Below limit
PFTrDA	<0.007 µg/L	0.007 µg/L	Below limit
PFUnA	<0.002 µg/L	0.002 µg/L	Below limit

Desal. Facility · Tested: July 2024

Compound	Measurement	EPA Limit	Comparison
lithium	<9.000 µg/L	10 µg/L	Below limit
PFHxS	<0.003 µg/L	0.004 µg/L	Below limit
HFPO-DA	<0.005 µg/L	0.01 µg/L	Below limit
PFNA	<0.004 µg/L	0.01 µg/L	Below limit
PFHxA	<0.003 µg/L	3 µg/L	Below limit
PFBA	<0.005 µg/L	6 µg/L	Below limit
11Cl-PF3OUdS	<0.005 µg/L	0.005 µg/L	Below limit
4:2 FTS	<0.003 µg/L	0.003 µg/L	Below limit
6:2 FTS	<0.005 µg/L	0.005 µg/L	Below limit
8:2 FTS	<0.005 µg/L	0.005 µg/L	Below limit
9Cl-PF3ONS	<0.002 µg/L	0.002 µg/L	Below limit
ADONA	<0.003 µg/L	0.003 µg/L	Below limit
PFBS	<0.003 µg/L	0.003 µg/L	Below limit
PFDA	<0.003 µg/L	0.003 µg/L	Below limit
PFDoA	<0.003 µg/L	0.003 µg/L	Below limit
PFHpA	<0.003 µg/L	0.003 µg/L	Below limit
PFHpS	<0.003 µg/L	0.003 µg/L	Below limit
PFOA	<0.004 µg/L	0.004 µg/L	Below limit
PFOS	<0.004 µg/L	0.004 µg/L	Below limit
PFPeA	<0.003 µg/L	0.003 µg/L	Below limit
PFTrDA	<0.007 µg/L	0.007 µg/L	Below limit
PFUnA	<0.002 µg/L	0.002 µg/L	Below limit

SFPUC · Tested: October 2024

Compound	Measurement	EPA Limit	Comparison
lithium	<9.000 µg/L	10 µg/L	Below limit
PFHxS	<0.003 µg/L	0.004 µg/L	Below limit
HFPO-DA	<0.005 µg/L	0.01 µg/L	Below limit
PFNA	<0.004 µg/L	0.01 µg/L	Below limit
PFHxA	<0.003 µg/L	3 µg/L	Below limit
PFBA	<0.005 µg/L	6 µg/L	Below limit
11Cl-PF3OUdS	<0.005 µg/L	0.005 µg/L	Below limit
4:2 FTS	<0.003 µg/L	0.003 µg/L	Below limit
6:2 FTS	<0.005 µg/L	0.005 µg/L	Below limit
8:2 FTS	<0.005 µg/L	0.005 µg/L	Below limit
9Cl-PF3ONS	<0.002 µg/L	0.002 µg/L	Below limit
ADONA	<0.003 µg/L	0.003 µg/L	Below limit
PFBS	<0.003 µg/L	0.003 µg/L	Below limit
PFDA	<0.003 µg/L	0.003 µg/L	Below limit
PFDoA	<0.003 µg/L	0.003 µg/L	Below limit
PFHpA	<0.003 µg/L	0.003 µg/L	Below limit
PFHpS	<0.003 µg/L	0.003 µg/L	Below limit
PFOA	<0.004 µg/L	0.004 µg/L	Below limit
PFOS	<0.004 µg/L	0.004 µg/L	Below limit
PFPeA	<0.003 µg/L	0.003 µg/L	Below limit
PFTrDA	<0.007 µg/L	0.007 µg/L	Below limit
PFUnA	<0.002 µg/L	0.002 µg/L	Below limit

Water TP #2 · Tested: October 2024

Compound	Measurement	EPA Limit	Comparison
lithium	<9.000 µg/L	10 µg/L	Below limit
PFHxS	<0.003 µg/L	0.004 µg/L	Below limit
HFPO-DA	<0.005 µg/L	0.01 µg/L	Below limit
PFNA	<0.004 µg/L	0.01 µg/L	Below limit
PFHxA	<0.003 µg/L	3 µg/L	Below limit
PFBA	<0.005 µg/L	6 µg/L	Below limit
11Cl-PF3OUdS	<0.005 µg/L	0.005 µg/L	Below limit
4:2 FTS	<0.003 µg/L	0.003 µg/L	Below limit
6:2 FTS	<0.005 µg/L	0.005 µg/L	Below limit
8:2 FTS	<0.005 µg/L	0.005 µg/L	Below limit
9Cl-PF3ONS	<0.002 µg/L	0.002 µg/L	Below limit
ADONA	<0.003 µg/L	0.003 µg/L	Below limit
PFBS	<0.003 µg/L	0.003 µg/L	Below limit
PFDA	<0.003 µg/L	0.003 µg/L	Below limit
PFDoA	<0.003 µg/L	0.003 µg/L	Below limit
PFHpA	<0.003 µg/L	0.003 µg/L	Below limit
PFHpS	<0.003 µg/L	0.003 µg/L	Below limit
PFOA	<0.004 µg/L	0.004 µg/L	Below limit
PFOS	<0.004 µg/L	0.004 µg/L	Below limit
PFPeA	<0.003 µg/L	0.003 µg/L	Below limit
PFTrDA	<0.007 µg/L	0.007 µg/L	Below limit
PFUnA	<0.002 µg/L	0.002 µg/L	Below limit

Water utilities serving ZIP 94537

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 PLEASANTONAction advised
ZONE 7 WATER AGENCYNo recent federal sampling

Modeled boundaries are shown with a dashed outline.

Frequently Asked Questions about ZIP 94537 Tap Water

What's in ZIP 94537 tap water?

ZIP 94537 did not show contaminants above EPA health guidelines in the latest available dataset. The full table on this page lists every compound that was tested.

Who provides tap water in ZIP 94537?

Public records identify CITY OF PLEASANTON as a primary water system associated with ZIP 94537. Service boundaries can vary by address, so confirm exact service with the utility.

When was ZIP 94537 tap water last tested?

The most recent test date used in this report is October 2024. EnviroClarity last refreshed this page on 2026-05-04.

Where can I find the official water quality report for ZIP 94537?

Every U.S. public water system is required to publish an annual Consumer Confidence Report (CCR). Contact CITY OF PLEASANTON or visit their website for the latest official report covering ZIP 94537. The EPA also maintains a national CCR locator.

Do I still need a water filter in ZIP 94537?

Even when EPA-tracked compounds are within limits, some households use a certified filter for taste, odor, or to add a margin against trace contaminants below the reporting limit. Match any filter's certifications (NSF/ANSI 42, 53, 58, or P473) to the specific compounds you care about.

Primary source EPA UCMR5 (2023-2025)

Guideline source EPA PFAS drinking water standard (PFOA: 0,004 µg/L, effective 2024, compliance by 2031)

Last tested October 2024

Last page update 2026-05-04

Check another ZIP code

Nearby ZIP reports

Data reflects publicly reported utility records from EPA datasets and local utility disclosures. This information is educational and not medical advice.

Add peace of mind → see certified filters for Fremont