Del Sur School/Westside Union District
Published drinking-water records and contacts for Del Sur School/Westside Union District. System CA1900750. Review sources and dates; not a real-time water assessment.
- System ID
- CA1900750
- State or territory
- CA
- Published population served
- 825
- System type (source code)
- NTNCWS
Published records and dates
- Lead and copper monitoring summaries: 13 — 2016-01-01 – 2024-12-31
- California DDW laboratory results: 32 — 2026-01-06 – 2026-05-12
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 | 2024-01-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2023-01-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2022-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2021-01-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2020-01-01 – 2020-06-30 | 2026Q3 |
| Lead (PB90) | 0.029 mg/L | 2019-07-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0.0065 mg/L | 2019-01-01 – 2019-06-30 | 2026Q3 |
| Lead (PB90) | 0.0256 mg/L | 2018-07-01 – 2018-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| NITRATE | 5.1 MG/L | 2026-05-12 | WELL 01 / California DDW laboratory results |
| TOTAL RADIUM FOR NTNC PER §64442(B)(3) | < 0.410000000 PCI/L | 2026-03-24 | WELL 01 / California DDW laboratory results |
| NITRATE | 4.2 MG/L | 2026-02-03 | WELL 01 / California DDW laboratory results |
| PERFLUOROPENTANESULFONIC ACID (PFPES) | < 2.000000000 NG/L | 2026-01-06 | WELL 01 / California DDW laboratory results |
| NETFOSAA | < 3.000000000 NG/L | 2026-01-06 | WELL 01 / California DDW laboratory results |
| ADONA | < 2.000000000 NG/L | 2026-01-06 | WELL 01 / California DDW laboratory results |
| PERFLUOROBUTANOIC ACID (PFBA) | < 2.000000000 NG/L | 2026-01-06 | WELL 01 / California DDW laboratory results |
| 9CL-PF3ONS | < 2.000000000 NG/L | 2026-01-06 | WELL 01 / California DDW laboratory results |
| NONAFLUORO NFDHA | < 2.000000000 NG/L | 2026-01-06 | WELL 01 / California DDW laboratory results |
| PERFLUORONONANOIC ACID (PFNA) | < 2.000000000 NG/L | 2026-01-06 | WELL 01 / California DDW laboratory results |
| PERFLUOROHEXANOIC ACID (PFHXA) | < 2.000000000 NG/L | 2026-01-06 | WELL 01 / California DDW laboratory results |
| PERFLUORO PFMBA | < 2.000000000 NG/L | 2026-01-06 | 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
2 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 |
|---|---|---|---|---|
| Consumer Confidence Rule / Consumer Confidence Report Complete Failure to Report | 2024-07-01 – — | Resolved | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1984-08-01 – 1984-08-31 | 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)
Masters, William: 661-722-0716
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.