City of Hollister
Published drinking-water records and contacts for City of Hollister. System CA3510001. Review sources and dates; not a real-time water assessment.
- System ID
- CA3510001
- State or territory
- CA
- Published population served
- 26017
- System type (source code)
- CWS
Published records and dates
- PFAS / lithium (EPA UCMR 5): 660 — 2023-11-15 – 2024-08-15
- Lead and copper monitoring summaries: 48 — 1993-01-01 – 2026-12-31
- California DDW laboratory results: 550 — 2026-01-15 – 2026-06-24
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
| Substance | Published result | Reporting limit | Sample date | Sampling location |
|---|---|---|---|---|
| 11Cl-PF3OUdS | < 0.005 µg/L | 0.005 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| 4:2 FTS | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| 6:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-08-15 | Nash Road Well 5 / 3510001801 |
| 8:2 FTS | < 0.005 µg/L | 0.005 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| 9Cl-PF3ONS | < 0.002 µg/L | 0.002 µg/L | 2024-08-15 | Lessalt Intertie / 3510001018 |
| ADONA | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | Nash Road Well 5 / 3510001801 |
| HFPO-DA | < 0.005 µg/L | 0.005 µg/L | 2024-08-15 | Bundeson Road Well 2 / 3510001803 |
| NEtFOSAA | < 0.005 µg/L | 0.005 µg/L | 2024-08-15 | Bundeson Road Well 2 / 3510001803 |
| NFDHA | < 0.02 µg/L | 0.02 µg/L | 2024-08-15 | West Hills WTP / 3510001001 |
| NMeFOSAA | < 0.006 µg/L | 0.006 µg/L | 2024-08-15 | Lessalt Intertie / 3510001018 |
| PFBA | < 0.005 µg/L | 0.005 µg/L | 2024-08-15 | Bundeson Road Well 2 / 3510001803 |
| PFBS | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | Bundeson Road Well 2 / 3510001803 |
| PFDA | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | West Hills WTP / 3510001001 |
| PFDoA | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | Bundeson Road Well 2 / 3510001803 |
| PFEESA | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | West Hills WTP / 3510001001 |
| PFHpA | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| PFHpS | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | Bundeson Road Well 2 / 3510001803 |
| PFHxA | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| PFHxS | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | Nash Road Well 5 / 3510001801 |
| PFMBA | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| PFMPA | < 0.004 µg/L | 0.004 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| PFNA | < 0.004 µg/L | 0.004 µg/L | 2024-08-15 | Bundeson Road Well 2 / 3510001803 |
| PFOA | < 0.004 µg/L | 0.004 µg/L | 2024-08-15 | Nash Road Well 5 / 3510001801 |
| PFOS | < 0.004 µg/L | 0.004 µg/L | 2024-08-15 | West Hills WTP / 3510001001 |
| PFPeA | < 0.003 µg/L | 0.003 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| PFPeS | < 0.004 µg/L | 0.004 µg/L | 2024-08-15 | South Street Well 4 / 3510001802 |
| PFTA | < 0.008 µg/L | 0.008 µg/L | 2024-08-15 | Bundeson Road Well 2 / 3510001803 |
| PFTrDA | < 0.007 µg/L | 0.007 µg/L | 2024-08-15 | West Hills WTP / 3510001001 |
| PFUnA | < 0.002 µg/L | 0.002 µg/L | 2024-08-15 | Nash Road Well 5 / 3510001801 |
| lithium | < 9 µg/L | 9 µg/L | 2024-08-15 | West Hills WTP / 3510001001 |
Download all EPA UCMR 5 records (CSV)
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | 0.0014 mg/L | 2024-01-01 – 2026-12-31 | 2026Q3 |
| Lead (PB90) | 0.0023 mg/L | 2021-01-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0.00138246 mg/L | 2018-01-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2015-01-01 – 2017-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2012-01-01 – 2014-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2009-01-01 – 2011-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2008-01-01 – 2010-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2005-01-01 – 2007-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| NITRITE | < 0.400000000 MG/L | 2026-06-24 | SOUTH STREET WELL 04 / California DDW laboratory results |
| NITRATE | 3.5 MG/L | 2026-06-24 | SOUTH STREET WELL 04 / California DDW laboratory results |
| NITRATE-NITRITE | 4.2 MG/L | 2026-06-24 | NASH ROAD WELL 05 / California DDW laboratory results |
| NITRATE-NITRITE | 3.5 MG/L | 2026-06-24 | SOUTH STREET WELL 04 / California DDW laboratory results |
| NITRITE | < 0.400000000 MG/L | 2026-06-24 | NASH ROAD WELL 05 / California DDW laboratory results |
| NITRATE | 4.2 MG/L | 2026-06-24 | NASH ROAD WELL 05 / California DDW laboratory results |
| GROSS ALPHA PARTICLE ACTIVITY | 1.95 PCI/L | 2026-04-22 | CULLUM WELL 02 / California DDW laboratory results |
| BROMOFORM | 22.29 UG/L | 2026-03-12 | DBPR Sample / California DDW laboratory results |
| BROMOFORM | 15.49 UG/L | 2026-03-12 | DBPR Sample / California DDW laboratory results |
| PERFLUORO PFMBA | < 2.000000000 NG/L | 2026-03-12 | CULLUM WELL 02 / California DDW laboratory results |
| PERFLUORO PFEESA | < 2.000000000 NG/L | 2026-03-12 | CULLUM WELL 02 / California DDW laboratory results |
| PERFLUORO PFEESA | < 2.000000000 NG/L | 2026-03-12 | BUNDESON ROAD WELL 02 / California DDW laboratory results |
State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.
Download state records with source notes (CSV)
Published compliance history
6 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2024-04-01 – 2024-06-30 | Archived | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2024-04-01 – 2024-06-30 | Archived | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2022-07-01 – 2022-09-30 | Resolved | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2018-10-01 – 2018-12-31 | Resolved | Yes | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Maximum Contaminant Level Violation, Average | 2018-07-01 – 2018-09-30 | Resolved | Yes | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1987-09-01 – 1987-09-30 | Archived | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
- California DDW laboratory results — last successful check: 2026-10-17
Administrative contact (EPA filing)
White, Tony: 831-636-4370
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.