94588
Pleasanton, CA
Alameda County · San Francisco-Oakland-Fremont, CA metro area
CITY OF PLEASANTON

Is tap water in Tassajara CCD (94588) safe to drink?

Higher concern
Last tested: May 2025
Source: Official EPA UCMR5 federal monitoring data. Last tested May 2025.
City:
Townships:
  • Livermore-Pleasanton CCD, CA
  • Tassajara CCD, CA
Neighborhoods:
  • Vineyard Mobile Villa
  • Hacienda Mobile Home Park
  • Pleasanton

The short answer for Tassajara CCD (94588)

Pleasanton tap water has 10 contaminants above EPA guidelines, including PFOS at 6.5× the limit (tested February 2025). See the full compound-by-compound breakdown and filter recommendations.

The health risk for Pleasanton

PFAS ('forever chemicals') have been detected above EPA limits in this water system's most recent tests. These synthetic chemicals do not break down in the body and are linked to a range of health effects. A certified filter is strongly recommended.
  • PFBS, PFHxS, PFOA, PFOS, PFPeA above limit.
PFOS concentration (µg/L) February 2025
0 µg/L 0.004 µg/L 0.05 µg/L
0.026 µg/L
Detected
µg/L
0.004 µg/L
EPA limit
guideline
550% above limit
Comparison
vs. guideline
EPA limit: 0.004 µg/L | Your water: 0.026 µg/L
Certified Filters for Pleasanton Tap Water

PFOS (a PFAS 'forever chemical') was detected above EPA limits. These filters are independently certified to reduce common drinking-water contaminants.

Water filter recommendation for Pleasanton tap water: Epic Pure XP Water Filter Pitcher
Pitcher filter
Epic Pure XP Water Filter Pitcher
NSF-certified dual-layer filtration reduces 70+ contaminants including PFAS, lead, chlorine, microplastics, and bacteria.
NSF/ANSI 42, 53, 401 & P473Removes 99.99% PFASMade in USABPA-free
Best for renters or quick setup. No installation needed.
Get the Epic Pure XP →
Most elevated compounds
Compound Measurement EPA Limit Comparison
PFOS
Tested: February 2025 · Well 6		 0.026 µg/L 0.004 µg/L 550% above limit
PFHxS
Tested: February 2025 · Well 6		 0.018 µg/L 0.004 µg/L 350% above limit
PFOS
Tested: February 2025 · Well 5		 0.015 µg/L 0.004 µg/L 275% above limit
PFBS
Tested: February 2025 · Well 6		 0.006 µg/L 0.003 µg/L 103% above limit
PFBS
Tested: February 2025 · Well 5		 0.006 µg/L 0.003 µg/L 93% above limit
View all tested compounds

Well 5 · Tested: February 2025

Compound Measurement EPA Limit Comparison
PFOS 0.015 µg/L 0.004 µg/L 275% above limit
PFBS 0.006 µg/L 0.003 µg/L 93% above limit
PFHxS 0.007 µg/L 0.004 µg/L 70% above limit
PFPeA 0.004 µg/L 0.003 µg/L 37% above limit
PFOA 0.005 µg/L 0.004 µg/L 28% above limit
PFHxA 0.004 µg/L 3 µg/L 0.1% of limit
PFBA 0.005 µg/L 6 µg/L 0.1% of limit
lithium <9.000 µg/L 10 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
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
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
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Well 6 · Tested: February 2025

Compound Measurement EPA Limit Comparison
PFOS 0.026 µg/L 0.004 µg/L 550% above limit
PFHxS 0.018 µg/L 0.004 µg/L 350% above limit
PFBS 0.006 µg/L 0.003 µg/L 103% above limit
PFPeA 0.003 µg/L 0.003 µg/L 7% above limit
PFOA 0.004 µg/L 0.004 µg/L 5% above limit
PFHxA 0.004 µg/L 3 µg/L 0.1% of limit
PFBA 0.006 µg/L 6 µg/L 0.1% of limit
lithium <9.000 µg/L 10 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
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
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
PFTrDA <0.007 µg/L 0.007 µg/L Below limit
PFUnA <0.002 µg/L 0.002 µg/L Below limit

Zone 7 Intertie · Tested: May 2025

Compound Measurement EPA Limit Comparison
lithium 9.620 µg/L 10 µg/L 96% of 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 94588

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.

Frequently Asked Questions about ZIP 94588 Tap Water

What contaminants are above EPA limits in ZIP 94588?

ZIP 94588 has 10 contaminants above EPA health guidelines in the latest available data, including PFOS at 6.5x the EPA guideline. The full table on this page lists every tested compound and its measured level.

Will boiling ZIP 94588 tap water remove PFOS?

No. Boiling does not remove PFAS, and the compounds can actually become more concentrated as water evaporates. To reduce PFAS at home, use a filter independently certified to NSF/ANSI P473 (activated-carbon pitcher or under-sink) or NSF/ANSI 58 (reverse osmosis).

Do basic pitcher filters remove PFOS?

Most basic pitcher filters are only certified to NSF/ANSI 42 or 53, which do not cover PFAS. Look for a filter independently certified to NSF/ANSI P473 (activated-carbon pitcher or under-sink) or NSF/ANSI 58 (reverse osmosis) on the spec sheet.

Who provides tap water in ZIP 94588?

Public records identify CITY OF PLEASANTON as a primary water system associated with ZIP 94588. Service boundaries can vary by address, so confirm exact service with the utility.

When was ZIP 94588 tap water last tested?

The most recent test date used in this report is May 2025. EnviroClarity last refreshed this page on 2026-05-04.

Where can I find the official water quality report for ZIP 94588?

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 94588. The EPA also maintains a national CCR locator.

Primary source EPA UCMR5 (2023-2025)
Guideline source EPA PFAS drinking water standard (PFOS: 0,004 µg/L, effective 2024, compliance by 2031)
Last tested May 2025
Last page update 2026-05-04

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

    Protect your water in Pleasanton → see certified filters