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Walnut Park Mutual Water Co.

Published drinking-water records and contacts for Walnut Park Mutual Water Co.. System CA1910169. Review sources and dates; not a real-time water assessment.

System ID
CA1910169
State or territory
CA
Published population served
16180
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/L2024-01-16Pumping Station / 1910169801
4:2 FTS< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
6:2 FTS< 0.005 µg/L0.005 µg/L2024-01-16Pumping Station / 1910169801
8:2 FTS< 0.005 µg/L0.005 µg/L2024-01-16Pumping Station / 1910169801
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2024-01-16Pumping Station / 1910169801
ADONA< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
HFPO-DA< 0.005 µg/L0.005 µg/L2024-01-16Pumping Station / 1910169801
NEtFOSAA< 0.005 µg/L0.005 µg/L2024-01-16Pumping Station / 1910169801
NFDHA< 0.02 µg/L0.02 µg/L2024-01-16Pumping Station / 1910169801
NMeFOSAA< 0.006 µg/L0.006 µg/L2024-01-16Pumping Station / 1910169801
PFBA< 0.005 µg/L0.005 µg/L2024-01-16Pumping Station / 1910169801
PFBS< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFDA< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFDoA< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFEESA< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFHpA< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFHpS< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFHxA< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFHxS< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFMBA< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFMPA< 0.004 µg/L0.004 µg/L2024-01-16Pumping Station / 1910169801
PFNA< 0.004 µg/L0.004 µg/L2024-01-16Pumping Station / 1910169801
PFOA< 0.004 µg/L0.004 µg/L2024-01-16Pumping Station / 1910169801
PFOS< 0.004 µg/L0.004 µg/L2024-01-16Pumping Station / 1910169801
PFPeA< 0.003 µg/L0.003 µg/L2024-01-16Pumping Station / 1910169801
PFPeS< 0.004 µg/L0.004 µg/L2024-01-16Pumping Station / 1910169801
PFTA< 0.008 µg/L0.008 µg/L2024-01-16Pumping Station / 1910169801
PFTrDA< 0.007 µg/L0.007 µg/L2024-01-16Pumping Station / 1910169801
PFUnA< 0.002 µg/L0.002 µg/L2024-01-16Pumping Station / 1910169801
lithium< 9 µg/L9 µg/L2024-01-16Pumping Station / 1910169801

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/L2021-01-01 – 2023-12-312026Q3
Lead (PB90) 0 mg/L2020-01-01 – 2022-12-312026Q3
Lead (PB90) 0 mg/L2017-01-01 – 2019-12-312026Q3
Lead (PB90) 0 mg/L2014-01-01 – 2016-12-312026Q3
Lead (PB90) 0 mg/L2011-01-01 – 2013-12-312026Q3
Lead (PB90) 0 mg/L2008-01-01 – 2010-12-312026Q3
Lead (PB90) 0 mg/L2005-01-01 – 2007-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
MONOCHLOROACETIC ACID< 2.000000000 UG/L2026-05-12DBPR Sample / California DDW laboratory results
MONOCHLOROACETIC ACID< 2.000000000 UG/L2026-05-12DBPR Sample / California DDW laboratory results
TTHM3.9 UG/L2026-05-12DBPR Sample / California DDW laboratory results
TTHM3.4 UG/L2026-05-12DBPR Sample / California DDW laboratory results
CHLOROFORM< 1.000000000 UG/L2026-05-12DBPR Sample / California DDW laboratory results
DIBROMOACETIC ACID< 1.000000000 UG/L2026-05-12DBPR Sample / California DDW laboratory results
BROMODICHLOROMETHANE< 1.000000000 UG/L2026-05-12DBPR Sample / California DDW laboratory results
DIBROMOCHLOROMETHANE1.8 UG/L2026-05-12DBPR Sample / California DDW laboratory results
DIBROMOCHLOROMETHANE1.3 UG/L2026-05-12DBPR Sample / California DDW laboratory results
DIBROMOACETIC ACID< 1.000000000 UG/L2026-05-12DBPR Sample / California DDW laboratory results
MONOBROMOACETIC ACID< 1.000000000 UG/L2026-05-12DBPR Sample / California DDW laboratory results
DIBROMOCHLOROMETHANE1.6 UG/L2026-05-12DBPR Sample / 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

2 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
Volatile Organic Chemicals / Notification, State2023-06-01 – 2024-03-14ResolvedNo2026Q3
Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R2019-10-01 – —ResolvedNo2026Q3

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)

Gomez, Mike: 323-585-7321

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