No health-based violations on EPA record since 2016.
Serves about 24,954 people (7,688 connections) with surface water bought from City of Hollister and San Benito County Water District.
From EPA's record for CA3510003. PurityMap is independent of Sunnyslope County Water Dist.
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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 May 2025 to August 2025.
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Lithium | 23.5 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Above the referenced health-based guidance value | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorooctanoic acid (PFOA) | 4.6 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| 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 | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| 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 | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| 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 | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| 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 | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| 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 | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2025-05-13 to 2025-08-13 | UCMR5 Analytical Results: SUNNYSLOPE COUNTY WATER DIST (CA3510003) |
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 →Sunnyslope County Water Dist's phone number on EPA record is 831-637-4670. Its mailing address is 3570 Airline Highway, HOLLISTER, CA 95023.
According to EPA's record, Sunnyslope County Water Dist uses surface water bought from City of Hollister and San Benito County Water District.
No health-based violations on EPA record since 2016. The record comes from EPA's SDWIS compliance database.
Lead was not detected at the 90th percentile of tap samples in Sunnyslope County Water Dist's latest lead and copper round, which ended in December 2023. The federal action level is 15 µg/L.
PurityMap has no verified website for Sunnyslope County Water Dist. Its phone number on EPA record is 831-637-4670. Its mailing address on EPA record is 3570 Airline Highway, HOLLISTER, CA 95023. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.