No health-based violations on EPA record since 2016.
Serves about 4,100 people (875 connections) with groundwater from its own wells, and buys water from Atascadero Mutual Water Co.
From EPA's record for CA4010832. PurityMap is independent of Atascadero State Hospital.
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No health-based violations in the last 10 years, from EPA's SDWIS compliance database.
EPA required this system to test for 30 unregulated and emerging contaminants, from February 2023 to August 2023.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 33 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorohexanesulfonic acid (PFHxS) | 34 ng/L | 10 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorobutanesulfonic acid (PFBS) | 5.5 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Within the referenced health-based guidance value | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorohexanoic acid (PFHxA) | 3.6 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluoropentanesulfonic acid (PFPeS) | 6.1 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-02-08 to 2023-08-15 | UCMR5 Analytical Results: ATASCADERO STATE HOSPITAL (CA4010832) |
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
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Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Atascadero State Hospital's phone number on EPA record is 805-468-2249. Its mailing address is PO Box 7001, ATASCADERO, CA 93423.
According to EPA's record, Atascadero State Hospital uses groundwater from its own wells, and buys water from Atascadero Mutual Water Co.
No health-based violations on EPA record since 2016. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Atascadero State Hospital's latest lead and copper round, which ended in June 2026. The federal action level is 15 µg/L.
PurityMap has no verified website for Atascadero State Hospital. Its phone number on EPA record is 805-468-2249. Its mailing address on EPA record is PO Box 7001, ATASCADERO, CA 93423. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.