Big Basin Water Company
Published drinking-water records and contacts for Big Basin Water Company. System CA4410001. Review sources and dates; not a real-time water assessment.
- System ID
- CA4410001
- State or territory
- CA
- Published population served
- 1120
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 22 — 1995-01-01 – 2025-12-31
- California DDW laboratory results: 113 — 2026-01-19 – 2026-04-20
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
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) | 0.012 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0.0011 mg/L | 2021-01-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0.0011 mg/L | 2021-01-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0.002119 mg/L | 2015-01-01 – 2017-12-31 | 2026Q3 |
| Lead (PB90) | 0.002119 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 | 2006-01-01 – 2008-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| MONOBROMOACETIC ACID | < 1.000000000 UG/L | 2026-04-20 | DBPR Sample / California DDW laboratory results |
| PERFLUORODODECANOIC ACID (PFDOA) | < 2.000000000 NG/L | 2026-04-20 | WELL 04 - RAW / California DDW laboratory results |
| DICHLOROACETIC ACID | 2 UG/L | 2026-04-20 | DBPR Sample / California DDW laboratory results |
| PERFLUOROHEPTANESULFONIC ACID (PFHPS) | < 2.000000000 NG/L | 2026-04-20 | WELL 04 - RAW / California DDW laboratory results |
| TRICHLOROACETIC ACID | < 1.000000000 UG/L | 2026-04-20 | DBPR Sample / California DDW laboratory results |
| TTHM | 4 UG/L | 2026-04-20 | DBPR Sample / California DDW laboratory results |
| PERFLUOROCTANE SULFONIC ACID (PFOS) | < 2.000000000 NG/L | 2026-04-20 | WELL 04 - RAW / California DDW laboratory results |
| CHLOROFORM | 2 UG/L | 2026-04-20 | DBPR Sample / California DDW laboratory results |
| PERFLUORO PFMBA | < 2.000000000 NG/L | 2026-04-20 | WELL 04 - RAW / California DDW laboratory results |
| DIBROMOCHLOROMETHANE | 2 UG/L | 2026-04-20 | DBPR Sample / California DDW laboratory results |
| CHLOROFORM | 1 UG/L | 2026-04-20 | DBPR Sample / California DDW laboratory results |
| TOTAL HALOACETIC ACIDS (HAA5) | < 2.000000000 UG/L | 2026-04-20 | DBPR Sample / 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
18 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 |
|---|---|---|---|---|
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-06-01 – 2022-06-30 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2022-01-01 – 2022-03-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2022-01-01 – 2022-03-31 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2021-10-01 – 2021-12-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2021-07-01 – 2021-09-30 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2021-07-01 – 2021-09-30 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2021-04-01 – 2021-06-30 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2021-04-01 – 2021-06-30 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2021-01-01 – 2021-03-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2021-01-01 – 2021-03-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2020-10-01 – 2020-12-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2020-10-01 – 2020-12-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2020-07-01 – 2020-09-30 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2020-07-01 – 2020-09-30 | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2018-01-01 – 2018-12-31 | Resolved | No | 2026Q3 |
| Arsenic Rule / Monitoring, Regular | 2018-01-01 – 2020-12-31 | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2018-01-01 – 2020-12-31 | Resolved | No | 2026Q3 |
| Synthetic Organic Chemicals / Monitoring, Regular | 2018-01-01 – 2020-12-31 | Resolved | 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)
Farjeat, Rene: 949-281-6542
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.