Cws-Onyx Water System
Published drinking-water records and contacts for Cws-Onyx Water System. System CA1510043. Review sources and dates; not a real-time water assessment.
- System ID
- CA1510043
- State or territory
- CA
- Published population served
- 284
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 44 — 1998-01-01 – 2025-12-31
- California DDW laboratory results: 481 — 2026-01-08 – 2026-06-25
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) | 0.001 mg/L | 2025-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0.0031 mg/L | 2024-01-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2023-01-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0.003 mg/L | 2022-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2021-07-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2021-01-01 – 2021-06-30 | 2026Q3 |
| Lead (PB90) | 0.00106 mg/L | 2020-07-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0.00197 mg/L | 2020-01-01 – 2020-06-30 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| TEMPERATURE (CENTIGRADE) | 23.6 C | 2026-06-25 | 15K TANK - BLENDED WATER - WELLS 01 & 06 / California DDW laboratory results |
| PH, FIELD | 6.5 PH | 2026-06-25 | 15K TANK - BLENDED WATER - WELLS 01 & 06 / California DDW laboratory results |
| PH, FIELD | 6.1 PH | 2026-06-25 | WELL 06 (SMITH WELL) / California DDW laboratory results |
| COMBINED URANIUM | 5.3 PCI/L | 2026-06-25 | 15K TANK - BLENDED WATER - WELLS 01 & 06 / California DDW laboratory results |
| ORTHOPHOSPHATE | 0.3 MG/L | 2026-06-25 | WELL 01 / California DDW laboratory results |
| NITRATE-NITRITE | 2.4 MG/L | 2026-06-25 | WELL 01 / California DDW laboratory results |
| NITRATE | 2.4 MG/L | 2026-06-25 | WELL 01 / California DDW laboratory results |
| FLUORIDE | 0.5 MG/L | 2026-06-25 | WELL 01 / California DDW laboratory results |
| IRON | 81 UG/L | 2026-06-25 | 15K TANK - BLENDED WATER - WELLS 01 & 06 / California DDW laboratory results |
| NITRATE | 1.4 MG/L | 2026-06-25 | 15K TANK - BLENDED WATER - WELLS 01 & 06 / California DDW laboratory results |
| TEMPERATURE (CENTIGRADE) | 19.2 C | 2026-06-25 | WELL 06 (SMITH WELL) / California DDW laboratory results |
| PH, FIELD | 6.5 PH | 2026-06-25 | 15K TANK - BLENDED WATER - WELLS 01 & 06 / 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
0 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
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: 2026-10-18
Administrative contact (EPA filing)
James, Sophie: 408-367-8593
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.