Muir Beach Community
Published drinking-water records and contacts for Muir Beach Community. System CA2100508. Review sources and dates; not a real-time water assessment.
- System ID
- CA2100508
- State or territory
- CA
- Published population served
- 336
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 28 — 2000-01-01 – 2023-12-31
- California DDW laboratory results: 152 — 2026-03-16 – 2026-06-22
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) | 0.01 mg/L | 2021-01-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0.0041 mg/L | 2018-01-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0.009 mg/L | 2015-01-01 – 2017-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2012-01-01 – 2014-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2011-01-01 – 2011-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2010-01-01 – 2010-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2008-01-01 – 2008-06-30 | 2026Q3 |
| Lead (PB90) | 0.0086 mg/L | 2007-07-01 – 2007-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| ASBESTOS | < 0.170000000 MFL | 2026-06-22 | 2008 WELL / California DDW laboratory results |
| MANGANESE | 20 UG/L | 2026-06-22 | PLANT 01 / California DDW laboratory results |
| MANGANESE | 130 UG/L | 2026-06-22 | 2002 WELL / California DDW laboratory results |
| IRON | < 100.000000000 UG/L | 2026-06-22 | 2008 WELL / California DDW laboratory results |
| MANGANESE | 160 UG/L | 2026-06-22 | 2008 WELL / California DDW laboratory results |
| PERFLUORO PFEESA | < 1.600000000 NG/L | 2026-06-11 | 2008 WELL / California DDW laboratory results |
| PERFLUOROHEXANE SULFONIC ACID 4:2 FTS | < 1.900000000 NG/L | 2026-06-11 | 2002 WELL / California DDW laboratory results |
| NONAFLUORO NFDHA | < 1.800000000 NG/L | 2026-06-11 | 2008 WELL / California DDW laboratory results |
| PERFLUOROHEPTANESULFONIC ACID (PFHPS) | < 1.800000000 NG/L | 2026-06-11 | 2008 WELL / California DDW laboratory results |
| PERFLUOROHEXANOIC ACID (PFHXA) | < 1.800000000 NG/L | 2026-06-11 | 2008 WELL / California DDW laboratory results |
| PERFLUOROUNDECANOIC ACID (PFUNA) | < 2.000000000 NG/L | 2026-06-11 | 2002 WELL / California DDW laboratory results |
| PERFLUORO PFMPA | < 2.000000000 NG/L | 2026-06-11 | 2002 WELL / 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
4 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 |
|---|---|---|---|---|
| Miscellaneous Other Rules / Notification, Public | 1984-08-01 – 1984-08-31 | 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 |
| Radionuclides and Revised Rad Rule / Monitoring, Regular | 1980-10-30 – 1981-10-29 | 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)
Halley, Mary: 415-388-7804
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.