Cayucos Beach Mutual Water Company
Published drinking-water records and contacts for Cayucos Beach Mutual Water Company. System CA4010006. Review sources and dates; not a real-time water assessment.
- System ID
- CA4010006
- State or territory
- CA
- Published population served
- 2567
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 24 — 1993-01-01 – 2025-12-31
- California DDW laboratory results: 78 — 2026-01-27 – 2026-05-13
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) | 0.00057 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0.00057 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0.0018 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | 0.0012 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2011-01-01 – 2013-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2008-01-01 – 2010-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2005-01-01 – 2007-12-31 | 2026Q3 |
| Lead (PB90) | 0.005 mg/L | 2004-01-01 – 2006-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| TDS | 600 MG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| NITRATE-NITRITE | 0.6 MG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| ALKALINITY, BICARBONATE | 391 MG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| ZINC | 38 UG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| SULFATE | 55 MG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| SODIUM | 61 MG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| ALKALINITY, CARBONATE | < 15.000000000 MG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| CALCIUM | 63 MG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| SILVER | < 0.500000000 UG/L | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| LANGELIER INDEX AT SOURCE TEMP. | 0.64 LANG | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| AGGRESSIVE INDEX | 12.7 AGGR | 2026-05-13 | WELL 01 (04) - STANDBY / California DDW laboratory results |
| NITRITE | < 0.100000000 MG/L | 2026-05-13 | WELL 01 (04) - STANDBY / 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: 2026-10-18
Administrative contact (EPA filing)
Pope, Grace: 805-995-3766
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.