93422
Atascadero, CA
San Luis Obispo County · San Luis Obispo-Paso Robles, CA metro area
ATASCADERO MUTUAL WATER CO

Is tap water in Atascadero CCD (93422) safe to drink?

Higher concern
Last tested: October 2023
Source: Official EPA UCMR5 federal monitoring data. Last tested October 2023.
Townships:
  • Atascadero CCD, CA
  • North Coast CCD, CA
Neighborhood:
  • Atascadero

The short answer for Atascadero CCD (93422)

Atascadero tap water has 8 contaminants above EPA guidelines, including PFOS at 5.6× the limit (tested October 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.
  • lithium, PFBS, PFHxS, PFOA, PFOS above limit.
PFOS concentration (µg/L) October 2023
0 µg/L 0.004 µg/L 0.05 µg/L
0.022 µg/L
Detected
µg/L
0.004 µg/L
EPA limit
guideline
458% above limit
Comparison
vs. guideline
EPA limit: 0.004 µg/L | Your water: 0.022 µg/L
Certified Filters for Atascadero 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 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.
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Most elevated compounds
Compound Measurement EPA Limit Comparison
PFOS
Tested: October 2023 · Treatment Building C		 0.022 µg/L 0.004 µg/L 458% above limit
PFBS
Tested: October 2023 · Treatment Building C		 0.009 µg/L 0.003 µg/L 213% above limit
lithium
Tested: October 2023 · Treatment Building C		 20.400 µg/L 10 µg/L 104% above limit
PFHxS
Tested: October 2023 · Treatment Building C		 0.008 µg/L 0.004 µg/L 90% above limit
PFOA
Tested: October 2023 · Treatment Building C		 0.007 µg/L 0.004 µg/L 85% above limit
View all tested compounds

Treatment Building C · Tested: October 2023

Compound Measurement EPA Limit Comparison
PFOS 0.022 µg/L 0.004 µg/L 458% above limit
PFBS 0.009 µg/L 0.003 µg/L 213% above limit
lithium 20.400 µg/L 10 µg/L 104% above limit
PFHxS 0.008 µg/L 0.004 µg/L 90% above limit
PFOA 0.007 µg/L 0.004 µg/L 85% above limit
PFBA 0.010 µg/L 6 µg/L 0.2% of 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
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
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

Treatment Building A · Tested: October 2023

Compound Measurement EPA Limit Comparison
PFOS 0.005 µg/L 0.004 µg/L 28% above limit
PFBS 0.004 µg/L 0.003 µg/L 23% above limit
PFHxS 0.003 µg/L 0.004 µg/L 77% 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
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

Treatment Building D · Tested: October 2023

Compound Measurement EPA Limit Comparison
lithium 10.800 µg/L 10 µg/L 8% above 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

Treatment Building B · Tested: October 2023

Compound Measurement EPA Limit Comparison
PFHxS 0.003 µg/L 0.004 µg/L 82% 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
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 93422

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 93422 Tap Water

What contaminants are above EPA limits in ZIP 93422?

ZIP 93422 has 8 contaminants above EPA health guidelines in the latest available data, including PFOS at 5.6x the EPA guideline. The full table on this page lists every tested compound and its measured level.

Will boiling ZIP 93422 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 93422?

Public records identify ATASCADERO MUTUAL WATER CO as a primary water system associated with ZIP 93422. Service boundaries can vary by address, so confirm exact service with the utility.

When was ZIP 93422 tap water last tested?

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

Where can I find the official water quality report for ZIP 93422?

Every U.S. public water system is required to publish an annual Consumer Confidence Report (CCR). Contact ATASCADERO MUTUAL WATER CO or visit their website for the latest official report covering ZIP 93422. The EPA also maintains a national CCR locator.

Primary source EPA UCMR5 (2023-2025)
Guideline source EPA drinking water standard (lithium: 10 µg/L)
Last tested October 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