Mark West Meadows Mutual Water
Published drinking-water records and contacts for Mark West Meadows Mutual Water. System CA4900905. Review sources and dates; not a real-time water assessment.
- System ID
- CA4900905
- State or territory
- CA
- Published population served
- 20
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 19 — 1997-01-01 – 2024-12-31
- California DDW laboratory results: 216 — 2026-04-14 – 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 | 2022-01-01 – 2024-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2019-01-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2013-01-01 – 2015-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2010-01-01 – 2012-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2007-01-01 – 2009-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2009-01-01 – 2009-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2006-01-01 – 2006-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2004-01-01 – 2006-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| ASBESTOS | < 0.170000000 MFL | 2026-05-12 | WELL 01 - STANDBY / California DDW laboratory results |
| DIQUAT | < 0.400000000 UG/L | 2026-04-29 | WELL 01 - STANDBY / California DDW laboratory results |
| ENDRIN | < 0.004800000 UG/L | 2026-04-27 | WELL 02 / California DDW laboratory results |
| LASSO | < 1.000000000 UG/L | 2026-04-27 | WELL 02 / California DDW laboratory results |
| PERFLUORONONANOIC ACID (PFNA) | < 2.000000000 NG/L | 2026-04-27 | WELL 02 / California DDW laboratory results |
| PARA-PARA DDT | < 0.004800000 UG/L | 2026-04-27 | WELL 02 / California DDW laboratory results |
| 11CL-PF3OUDS | < 2.000000000 NG/L | 2026-04-27 | WELL 02 / California DDW laboratory results |
| CARBOFURAN | < 5.000000000 UG/L | 2026-04-27 | WELL 01 - STANDBY / California DDW laboratory results |
| BHC-GAMMA | < 0.004700000 UG/L | 2026-04-27 | WELL 01 - STANDBY / California DDW laboratory results |
| BROMACIL | < 10.000000000 UG/L | 2026-04-27 | WELL 02 / California DDW laboratory results |
| BENZO(A)PYRENE | < 0.100000000 UG/L | 2026-04-27 | WELL 01 - STANDBY / California DDW laboratory results |
| .DELTA.-BHC | < 0.004800000 UG/L | 2026-04-27 | WELL 02 / 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
5 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 |
|---|---|---|---|---|
| Lead and Copper Rule Revisions / LSL Inventory | 2024-10-17 – — | Unaddressed | Yes | 2026Q3 |
| Lead and Copper Rule Revisions / LSL Reporting | 2024-10-17 – — | Unaddressed | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1984-09-01 – 1984-09-30 | Archived | No | 2026Q3 |
| Miscellaneous Other Rules / Notification, Public | 1984-07-01 – 1984-07-31 | Archived | No | 2026Q3 |
| Radionuclides and Revised Rad Rule / Monitoring, Regular | 1981-10-01 – 1982-09-30 | 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)
Lampi, David: 707-578-7982
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.