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Brock Mutual Water Company

Published drinking-water records and contacts for Brock Mutual Water Company. System CA1500409. Review sources and dates; not a real-time water assessment.

System ID
CA1500409
State or territory
CA
Published population served
462
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

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/L2022-01-01 – 2024-12-312026Q3
Lead (PB90) 0 mg/L2021-01-01 – 2023-12-312026Q3
Lead (PB90) 0.0009 mg/L2020-01-01 – 2020-12-312026Q3
Lead (PB90) 0 mg/L2017-01-01 – 2019-12-312026Q3
Lead (PB90) 0 mg/L2014-01-01 – 2016-12-312026Q3
Lead (PB90) 0 mg/L2012-01-01 – 2012-12-312026Q3
Lead (PB90) 0.005 mg/L1997-01-01 – 1999-12-312026Q3
Lead (PB90) 0.005 mg/L1996-01-01 – 1998-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
NITRATE4.8 MG/L2026-06-11WELL 02 - NORTH - RAW / California DDW laboratory results
ARSENIC< 10.000000000 UG/L2026-06-11WELL 02 - NORTH - RAW / California DDW laboratory results
1,2,3-TRICHLOROPROPANE0.031 UG/L2026-06-11WELL 02 - NORTH - RAW / California DDW laboratory results
NITRATE12 MG/L2026-06-11WELL 01 - SOUTH - RAW / California DDW laboratory results
1,2,3-TRICHLOROPROPANE0.11 UG/L2026-06-11WELL 01 - SOUTH - RAW / California DDW laboratory results
ARSENIC< 2.000000000 UG/L2026-06-11WELL 01 - SOUTH - RAW / California DDW laboratory results
ARSENIC2.3 UG/L2026-05-21WELL 01 - SOUTH - RAW / California DDW laboratory results
NITRATE11 MG/L2026-05-21WELL 01 - SOUTH - RAW / California DDW laboratory results
1,2,3-TRICHLOROPROPANE0.025 UG/L2026-05-21WELL 02 - NORTH - RAW / California DDW laboratory results
1,2,3-TRICHLOROPROPANE0.088 UG/L2026-05-21WELL 01 - SOUTH - RAW / California DDW laboratory results
ARSENIC2.2 UG/L2026-05-21WELL 02 - NORTH - RAW / California DDW laboratory results
NITRATE4.8 MG/L2026-05-21WELL 02 - NORTH - RAW / 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

37 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / recordPeriodRecorded statusHealth-based (EPA classification)Source quarter
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2023-04-01 – 2023-06-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2023-01-01 – 2023-03-31ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2022-10-01 – 2022-12-31ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2022-07-01 – 2022-09-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2022-04-01 – 2022-06-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2022-01-01 – 2022-03-31ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2021-10-01 – 2021-12-31ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2021-07-01 – 2021-09-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2021-04-01 – 2021-06-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2021-01-01 – 2021-03-31ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2020-10-01 – 2020-12-31ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2020-07-01 – 2020-09-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2020-04-01 – 2020-06-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2020-01-01 – 2020-03-31ArchivedYes2026Q3
Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R2019-10-01 – —ResolvedNo2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2019-10-01 – 2019-12-31ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2019-07-01 – 2019-09-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2019-04-01 – 2019-06-30ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2019-01-01 – 2019-03-31ArchivedYes2026Q3
Nitrate Rule / Maximum Contaminant Level Violation, Single Sample2018-10-01 – 2018-12-31ArchivedYes2026Q3

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)

Henry, Lois: 661-395-7373

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