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Montara Water And Sanitary District

Published drinking-water records and contacts for Montara Water And Sanitary District. System CA4110010. Review sources and dates; not a real-time water assessment.

System ID
CA4110010
State or territory
CA
Published population served
6078
System type (source code)
CWS

Published records and dates

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

EPA UCMR 5 — most recent imported sample per substance
SubstancePublished resultReporting limitSample dateSampling location
11Cl-PF3OUdS< 0.005 µg/L0.005 µg/L2026-01-26Alta Vista Well / 027
4:2 FTS< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
6:2 FTS< 0.005 µg/L0.005 µg/L2026-01-26Alta Vista Well / 027
8:2 FTS< 0.005 µg/L0.005 µg/L2026-01-26Alta Vista Well / 027
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2026-01-26Alta Vista Well / 027
ADONA< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
HFPO-DA< 0.005 µg/L0.005 µg/L2026-01-26Alta Vista Well / 027
NEtFOSAA< 0.005 µg/L0.005 µg/L2026-01-26Alta Vista Well / 027
NFDHA< 0.02 µg/L0.02 µg/L2026-01-26Alta Vista Well / 027
NMeFOSAA< 0.006 µg/L0.006 µg/L2026-01-26Alta Vista Well / 027
PFBA< 0.005 µg/L0.005 µg/L2026-01-26Alta Vista Well / 027
PFBS< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFDA< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFDoA< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFEESA< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFHpA< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFHpS< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFHxA< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFHxS< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFMBA< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFMPA< 0.004 µg/L0.004 µg/L2026-01-26Alta Vista Well / 027
PFNA< 0.004 µg/L0.004 µg/L2026-01-26Alta Vista Well / 027
PFOA< 0.004 µg/L0.004 µg/L2026-01-26Alta Vista Well / 027
PFOS< 0.004 µg/L0.004 µg/L2026-01-26Alta Vista Well / 027
PFPeA< 0.003 µg/L0.003 µg/L2026-01-26Alta Vista Well / 027
PFPeS< 0.004 µg/L0.004 µg/L2026-01-26Alta Vista Well / 027
PFTA< 0.008 µg/L0.008 µg/L2026-01-26Alta Vista Well / 027
PFTrDA< 0.007 µg/L0.007 µg/L2026-01-26Alta Vista Well / 027
PFUnA< 0.002 µg/L0.002 µg/L2026-01-26Alta Vista Well / 027
lithium< 9 µg/L9 µg/L2026-01-26Alta Vista Well / 027

Download all EPA UCMR 5 records (CSV)

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

Eight most recent imported monitoring summaries
SubstancePublished 90th percentileMonitoring periodSource quarter
Lead (PB90) 0 mg/L2024-01-01 – 2026-12-312026Q3
Lead (PB90) 0 mg/L2023-01-01 – 2023-12-312026Q3
Lead (PB90) 0 mg/L2022-01-01 – 2022-12-312026Q3
Lead (PB90) 0 mg/L2021-01-01 – 2021-12-312026Q3
Lead (PB90) 0 mg/L2020-01-01 – 2020-12-312026Q3
Lead (PB90) 0 mg/L2019-01-01 – 2019-06-302026Q3
Lead (PB90) 0 mg/L2018-07-01 – 2018-12-312026Q3
Lead (PB90) 0 mg/L2017-07-01 – 2017-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
PERFLUOROHEXANE SULFONIC ACID (PFHxS)2.4 NG/L2026-06-17131 CODO WELL - MONITORING WELL / California DDW laboratory results
PERFLUOROBUTANE SULFONIC ACID (PFBS)< 2.000000000 NG/L2026-06-17N AIRPORT WELL - MONITORING WELL / California DDW laboratory results
PERFLUORO PFMPA< 2.000000000 NG/L2026-06-17131 CODO WELL - MONITORING WELL / California DDW laboratory results
PERFLUOROPENTANESULFONIC ACID (PFPES)< 2.000000000 NG/L2026-06-17N AIRPORT WELL - MONITORING WELL / California DDW laboratory results
PERFLUORODECANE SULFONIC ACID 8:2 FTS< 5.000000000 NG/L2026-06-17131 CODO WELL - MONITORING WELL / California DDW laboratory results
PERFLUORO PFMBA< 2.000000000 NG/L2026-06-17131 CODO WELL - MONITORING WELL / California DDW laboratory results
PERFLUORODODECANOIC ACID (PFDOA)< 2.000000000 NG/L2026-06-17131 CODO WELL - MONITORING WELL / California DDW laboratory results
PERFLUOROHEPTANESULFONIC ACID (PFHPS)< 2.000000000 NG/L2026-06-17N AIRPORT WELL - MONITORING WELL / California DDW laboratory results
PERFLUORONONANOIC ACID (PFNA)< 2.000000000 NG/L2026-06-17N AIRPORT WELL - MONITORING WELL / California DDW laboratory results
PERFLUOROPENTANOIC ACID (PFPEA)< 2.000000000 NG/L2026-06-17N AIRPORT WELL - MONITORING WELL / California DDW laboratory results
PERFLUORODECANOIC ACID (PFDA)< 2.000000000 NG/L2026-06-17131 CODO WELL - MONITORING WELL / California DDW laboratory results
HFPO-DA< 2.000000000 NG/L2026-06-17131 CODO WELL - MONITORING 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

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.

Administrative contact (EPA filing)

Heldmaier, Clemens: 650-728-3358

An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.

Official state resources · How to read these records