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Golden State Water Company - Simi Valley

Published drinking-water records and contacts for Golden State Water Company - Simi Valley. System CA5610059. Review sources and dates; not a real-time water assessment.

System ID
CA5610059
State or territory
CA
Published population served
45128
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/L2025-03-11MWDSC Intertie / 5610059005
4:2 FTS< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
6:2 FTS< 0.005 µg/L0.005 µg/L2025-03-11MWDSC Intertie / 5610059005
8:2 FTS< 0.005 µg/L0.005 µg/L2025-03-11MWDSC Intertie / 5610059005
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2025-03-11MWDSC Intertie / 5610059005
ADONA< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
HFPO-DA< 0.005 µg/L0.005 µg/L2025-03-11MWDSC Intertie / 5610059005
NEtFOSAA< 0.005 µg/L0.005 µg/L2025-03-11MWDSC Intertie / 5610059005
NFDHA< 0.02 µg/L0.02 µg/L2025-03-11MWDSC Intertie / 5610059005
NMeFOSAA< 0.006 µg/L0.006 µg/L2025-03-11MWDSC Intertie / 5610059005
PFBA< 0.005 µg/L0.005 µg/L2025-03-11MWDSC Intertie / 5610059005
PFBS< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFDA< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFDoA< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFEESA< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFHpA< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFHpS< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFHxA< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFHxS< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFMBA< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFMPA< 0.004 µg/L0.004 µg/L2025-03-11MWDSC Intertie / 5610059005
PFNA< 0.004 µg/L0.004 µg/L2025-03-11MWDSC Intertie / 5610059005
PFOA< 0.004 µg/L0.004 µg/L2025-03-11MWDSC Intertie / 5610059005
PFOS< 0.004 µg/L0.004 µg/L2025-03-11MWDSC Intertie / 5610059005
PFPeA< 0.003 µg/L0.003 µg/L2025-03-11MWDSC Intertie / 5610059005
PFPeS< 0.004 µg/L0.004 µg/L2025-03-11MWDSC Intertie / 5610059005
PFTA< 0.008 µg/L0.008 µg/L2025-03-11MWDSC Intertie / 5610059005
PFTrDA< 0.007 µg/L0.007 µg/L2025-03-11MWDSC Intertie / 5610059005
PFUnA< 0.002 µg/L0.002 µg/L2025-03-11MWDSC Intertie / 5610059005
lithium< 9 µg/L9 µg/L2025-03-11MWDSC Intertie / 5610059005

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) 0.006 mg/L2024-01-01 – 2026-12-312026Q3
Lead (PB90) 0 mg/L2021-01-01 – 2023-12-312026Q3
Lead (PB90) 0.0089 mg/L2018-01-01 – 2020-12-312026Q3
Lead (PB90) 0.006 mg/L2015-01-01 – 2017-12-312026Q3
Lead (PB90) 0.0049 mg/L2012-01-01 – 2014-12-312026Q3
Lead (PB90) 0.0018 mg/L2009-01-01 – 2011-12-312026Q3
Lead (PB90) 0.0027 mg/L2006-01-01 – 2008-12-312026Q3
Lead (PB90) 0.002 mg/L2005-01-01 – 2005-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
TETRACHLOROETHYLENE0.84 UG/L2026-07-07NILES WELL 01 / California DDW laboratory results
PERCHLORATE0.85 UG/L2026-07-07MWD,SYC-3, NILES - TRT BLENDING, CL / California DDW laboratory results
PERCHLORATE4.2 UG/L2026-07-07SYCAMORE WELL 03 / California DDW laboratory results
NITRATE12 MG/L2026-07-07NILES WELL 01 / California DDW laboratory results
TDS660 MG/L2026-07-07MWD,SYC-3, NILES - TRT BLENDING, CL / California DDW laboratory results
TRICHLOROETHYLENE< 0.500000000 UG/L2026-07-07SYCAMORE WELL 03 / California DDW laboratory results
TETRACHLOROETHYLENE< 0.500000000 UG/L2026-07-07SYCAMORE WELL 03 / California DDW laboratory results
TDS2000 MG/L2026-07-07SYCAMORE WELL 03 / California DDW laboratory results
CONDUCTIVITY @ 25 C UMHOS/CM2400 UMHO/CM2026-07-07SYCAMORE WELL 03 / California DDW laboratory results
CONDUCTIVITY @ 25 C UMHOS/CM2100 UMHO/CM2026-07-07NILES WELL 01 / California DDW laboratory results
NITRATE3.5 MG/L2026-07-07MWD,SYC-3, NILES - TRT BLENDING, CL / California DDW laboratory results
SELENIUM12 UG/L2026-07-07MWD,SYC-3, NILES - TRT BLENDING, CL / 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)

White, Dawn: 916-853-3615

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