Rancho Santa Teresa Mw Co.
Published drinking-water records and contacts for Rancho Santa Teresa Mw Co.. System CA3700918. Review sources and dates; not a real-time water assessment.
- System ID
- CA3700918
- State or territory
- CA
- Published population served
- 102
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 15 — 2008-01-01 – 2025-12-31
- California DDW laboratory results: 86 — 2026-01-13 – 2026-06-24
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) | 0.0037 mg/L | 2025-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0.0018 mg/L | 2024-01-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0.0035 mg/L | 2023-07-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0.0029 mg/L | 2023-01-01 – 2023-06-30 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2022-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2020-01-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0.0104 mg/L | 2019-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0.01655 mg/L | 2018-01-01 – 2018-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| PERFLUOROBUTANOIC ACID (PFBA) | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| PERFLUORODODECANOIC ACID (PFDOA) | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| PERFLUOROHEPTANESULFONIC ACID (PFHPS) | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| ADONA | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| PERFLUORO PFMBA | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| PERFLUOROUNDECANOIC ACID (PFUNA) | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| PERFLUORODECANE SULFONIC ACID 8:2 FTS | < 4.500000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| PERFLUOROHEPTANOIC ACID (PFHPA) | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| PERFLUOROHEXANE SULFONIC ACID (PFHxS) | 2.0 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| 11CL-PF3OUDS | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| PERFLUORO PFMPA | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / California DDW laboratory results |
| NONAFLUORO NFDHA | < 1.800000000 NG/L | 2026-06-24 | WELL 04 / 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
54 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 | 2024-10-01 – 2024-12-31 | Archived | Yes | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2023-10-01 – 2023-12-31 | Archived | Yes | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2023-08-29 – — | Resolved | No | 2026Q3 |
| Nitrate Rule / Maximum Contaminant Level Violation, Single Sample | 2023-07-01 – 2023-09-30 | Archived | Yes | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-07-01 – 2022-09-30 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-06-01 – 2022-06-30 | Archived | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-05-01 – 2022-05-31 | Archived | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-04-01 – 2022-04-30 | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2022-04-01 – 2022-06-30 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-02-01 – 2022-02-28 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2022-01-01 – 2022-03-31 | Resolved | No | 2026Q3 |
| Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R | 2021-10-01 – — | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2021-10-01 – 2021-12-31 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2021-07-01 – 2021-09-30 | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2021-07-01 – 2021-09-30 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2021-04-01 – 2021-06-30 | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2021-04-01 – 2021-06-30 | Resolved | No | 2026Q3 |
| Nitrate Rule / Monitoring, Regular | 2021-01-01 – 2021-03-31 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2021-01-01 – 2021-03-31 | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2020-10-01 – 2020-12-31 | Resolved | 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: 2026-10-18
Administrative contact (EPA filing)
Mattern, Ralph: 858-354-5073
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.