San Diego County Water Authority
Published drinking-water records and contacts for San Diego County Water Authority. System CA3710042. Review sources and dates; not a real-time water assessment.
- System ID
- CA3710042
- State or territory
- CA
- Published population served
- 0
- System type (source code)
- CWS
Published records and dates
- California DDW laboratory results: 417 — 2026-01-01 – 2026-06-11
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
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| DICHLOROACETIC ACID | 4.9 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| MONOBROMOACETIC ACID | < 1.000000000 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| MONOCHLOROACETIC ACID | < 2.000000000 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| TTHM | 34.99 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| BROMODICHLOROMETHANE | 12.19 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| DIBROMOACETIC ACID | 1.7 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| DIBROMOCHLOROMETHANE | 7.64 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| CHLOROFORM | 13.78 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| TRICHLOROACETIC ACID | < 1.000000000 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| TOTAL HALOACETIC ACIDS (HAA5) | 6.6 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| BROMOFORM | 1.38 UG/L | 2026-06-11 | TWIN OAKS VALLEY WTP - TREATED / California DDW laboratory results |
| ADONA | < 2.000000000 NG/L | 2026-06-09 | OLIVENHAIN RESERVOIR - RAW / 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
1 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 |
|---|---|---|---|---|
| Surface Water Treatment Rule / Treatment Technique (SWTR and GWR) | 2019-04-01 – 2019-04-30 | Resolved | 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)
Denham, Dan: 858-522-6600
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.