Darr Water Co
Published drinking-water records and contacts for Darr Water Co. System CA3601013. Review sources and dates; not a real-time water assessment.
- System ID
- CA3601013
- State or territory
- CA
- Published population served
- 543
- System type (source code)
- NTNCWS
Published records and dates
- Lead and copper monitoring summaries: 7 — 2013-01-01 – 2025-12-31
- California DDW laboratory results: 26 — 2026-01-15 – 2026-07-08
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 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2016-01-01 – 2018-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2013-01-01 – 2015-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| ARSENIC | < 2.000000000 UG/L | 2026-07-08 | WELL 02 (PILOT WELL) / California DDW laboratory results |
| ARSENIC | < 2.000000000 UG/L | 2026-07-08 | TREATMENT PLANT / California DDW laboratory results |
| RADIUM-226 | 0.840 PCI/L | 2026-06-16 | WELL 02 (PILOT WELL) / California DDW laboratory results |
| GROSS ALPHA PARTICLE ACTIVITY | 12.3 PCI/L | 2026-06-16 | WELL 02 (PILOT WELL) / California DDW laboratory results |
| COMBINED RADIUM (-226 & -228) | 1.50 PCI/L | 2026-06-16 | WELL 02 (PILOT WELL) / California DDW laboratory results |
| RADIUM-228 | 0.660 PCI/L | 2026-06-16 | WELL 02 (PILOT WELL) / California DDW laboratory results |
| PERCHLORATE | 1.8 UG/L | 2026-06-04 | WELL 02 (PILOT WELL) / California DDW laboratory results |
| ARSENIC | 29 UG/L | 2026-06-04 | WELL 02 (PILOT WELL) / California DDW laboratory results |
| ARSENIC | < 2.000000000 UG/L | 2026-06-04 | TREATMENT PLANT / California DDW laboratory results |
| COMBINED URANIUM | 10 PCI/L | 2026-06-04 | WELL 02 (PILOT WELL) / California DDW laboratory results |
| ARSENIC | 2.8 UG/L | 2026-05-15 | TREATMENT PLANT / California DDW laboratory results |
| ARSENIC | 64 UG/L | 2026-05-15 | WELL 02 (PILOT WELL) / 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
12 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) | 2026-02-01 – 2026-02-28 | Archived | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2025-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2025-01-01 – 2025-12-31 | Archived | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2024-01-01 – 2024-12-31 | Archived | No | 2026Q3 |
| Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R | 2023-10-01 – — | Addressed | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2023-01-01 – 2023-12-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2022-01-01 – 2022-12-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2022-01-01 – 2022-12-31 | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2022-01-01 – 2024-12-31 | Archived | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2021-01-01 – 2023-12-31 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2020-11-01 – 2020-11-30 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2020-10-01 – 2020-10-31 | 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)
Darr, Dennis: 760-762-6759
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.