Joint Regional Water Supply System
Published drinking-water records and contacts for Joint Regional Water Supply System. System CA3010071. Review sources and dates; not a real-time water assessment.
- System ID
- CA3010071
- State or territory
- CA
- Published population served
- 3947
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 4 — 2018-01-01 – 2024-12-31
- California DDW laboratory results: 130 — 2026-03-09 – 2026-06-08
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Read the provider’s annual water quality report
Report link listed: 2026-10-05. This is not the report’s sampling date.
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) | 0.0059 mg/L | 2022-01-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2019-01-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0.001 mg/L | 2018-07-01 – 2018-12-31 | 2026Q3 |
| Lead (PB90) | 0.0024 mg/L | 2018-01-01 – 2018-06-30 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| TTHM | 45 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| BROMODICHLOROMETHANE | 11 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| BROMOFORM | 5.1 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| DIBROMOCHLOROMETHANE | 12 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| BROMODICHLOROMETHANE | 12 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| DIBROMOCHLOROMETHANE | 15 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| BROMODICHLOROMETHANE | 14 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| CHLOROFORM | 8.0 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| BROMODICHLOROMETHANE | 9.8 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| TTHM | 39 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| CHLOROFORM | 8.5 UG/L | 2026-06-08 | DBPR Sample / California DDW laboratory results |
| BROMODICHLOROMETHANE | 12 UG/L | 2026-06-08 | 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
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: 2026-10-17
Administrative contact (EPA filing)
Serna, Marc: 949-342-2179
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.