One Stop Ws
Published drinking-water records and contacts for One Stop Ws. System CA5000457. Review sources and dates; not a real-time water assessment.
- System ID
- CA5000457
- State or territory
- CA
- Published population served
- 50
- System type (source code)
- TNCWS
Published records and dates
- California DDW laboratory results: 15 — 2026-01-26 – 2026-04-08
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
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| FLUORIDE | < 0.100000000 MG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| SODIUM | 29 MG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| IRON | < 100.000000000 UG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| PH | 8.07 PH | 2026-04-08 | WELL 01 / California DDW laboratory results |
| HYDROXIDE AS CALCIUM CARBONATE | < 5.000000000 MG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| MANGANESE | < 20.000000000 UG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| MAGNESIUM | 15 MG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| NITRATE | 10 MG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| ALKALINITY, CARBONATE | < 5.000000000 MG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| ALKALINITY, BICARBONATE | 140 MG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| ALKALINITY, TOTAL | 140 MG/L | 2026-04-08 | WELL 01 / California DDW laboratory results |
| HARDNESS, TOTAL (AS CACO3) | 185 MG/L | 2026-04-08 | WELL 01 / 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
21 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 |
|---|---|---|---|---|
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2026-01-01 – 2026-03-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2025-10-01 – 2025-12-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2025-04-01 – 2025-06-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2024-07-01 – 2024-09-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2024-04-01 – 2024-06-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2024-01-01 – 2024-03-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2023-10-01 – 2023-12-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2023-07-01 – 2023-09-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2023-04-01 – 2023-06-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2023-01-01 – 2023-03-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2022-10-01 – 2022-12-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2022-07-01 – 2022-09-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2022-04-01 – 2022-06-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2022-01-01 – 2022-03-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2021-10-01 – 2021-12-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2021-07-01 – 2021-09-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2020-10-01 – 2020-12-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Average | 2020-07-01 – 2020-09-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2019-04-01 – 2019-06-30 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2019-01-01 – 2019-03-31 | Archived | Yes | 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: 2026-10-18
Administrative contact (EPA filing)
Toscano, Miguel: 408-310-0040
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.