93423
Atascadero, CA
ATASCADERO STATE HOSPITAL

Is tap water in Atascadero (ZIP 93423) safe to drink?

Higher concern
Last tested: August 2023
Source: Official EPA UCMR5 federal monitoring data. Last tested August 2023.

The short answer for Atascadero (ZIP 93423)

Atascadero tap water has 3 contaminants above EPA guidelines, including PFBS at 1.2× the limit (tested August 2023). See the full compound-by-compound breakdown and filter recommendations.

The health risk for Atascadero

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, PFOS above limit.
PFBS concentration (µg/L) August 2023
0 µg/L 0.003 µg/L 0.01 µg/L
0.004 µg/L
Detected
µg/L
0.003 µg/L
EPA limit
guideline
20% above limit
Comparison
vs. guideline
EPA limit: 0.003 µg/L | Your water: 0.004 µg/L
Certified Filters for Atascadero Tap Water

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

Water filter recommendation for Atascadero 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
PFBS
Tested: August 2023 · WELL 04 - TRT CL		 0.004 µg/L 0.003 µg/L 20% above limit
PFHxS
Tested: August 2023 · WELL 04 - TRT CL		 0.004 µg/L 0.004 µg/L 10% above limit
PFOS
Tested: August 2023 · WELL 04 - TRT CL		 0.004 µg/L 0.004 µg/L 7% above limit
View all tested compounds

WELL 04 - TRT CL · Tested: August 2023

Compound Measurement EPA Limit Comparison
PFBS 0.004 µg/L 0.003 µg/L 20% above limit
PFHxS 0.004 µg/L 0.004 µg/L 10% above limit
PFOS 0.004 µg/L 0.004 µg/L 7% above 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
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
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
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 93423

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. Outlines appear when service-area boundary data is available for this ZIP.

Frequently Asked Questions about ZIP 93423 Tap Water

What contaminants are above EPA limits in ZIP 93423?

ZIP 93423 has 3 contaminants above EPA health guidelines in the latest available data, including PFBS at 1.2x the EPA guideline. The full table on this page lists every tested compound and its measured level.

Will boiling ZIP 93423 tap water remove PFBS?

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 PFBS?

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 93423?

Public records identify ATASCADERO STATE HOSPITAL as a primary water system associated with ZIP 93423. Service boundaries can vary by address, so confirm exact service with the utility.

When was ZIP 93423 tap water last tested?

The most recent test date used in this report is August 2023. EnviroClarity last refreshed this page on 2026-05-04.

Where can I find the official water quality report for ZIP 93423?

Every U.S. public water system is required to publish an annual Consumer Confidence Report (CCR). Contact ATASCADERO STATE HOSPITAL or visit their website for the latest official report covering ZIP 93423. The EPA also maintains a national CCR locator.

Primary source EPA UCMR5 (2023-2025)
Guideline source EPA drinking water standard (PFBS: 0,003 µg/L)
Last tested August 2023
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 Atascadero → see certified filters