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Cal-Water Service Co.-Oroville

Published drinking-water records and contacts for Cal-Water Service Co.-Oroville. System CA0410005. Review sources and dates; not a real-time water assessment.

System ID
CA0410005
State or territory
CA
Published population served
11106
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/L2025-07-15WTP EFFLUENT / 0410005801
4:2 FTS< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
6:2 FTS< 0.005 µg/L0.005 µg/L2025-07-15WTP EFFLUENT / 0410005801
8:2 FTS< 0.005 µg/L0.005 µg/L2025-07-15WTP EFFLUENT / 0410005801
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2025-07-15WTP EFFLUENT / 0410005801
ADONA< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
HFPO-DA< 0.005 µg/L0.005 µg/L2025-07-15WTP EFFLUENT / 0410005801
NEtFOSAA< 0.005 µg/L0.005 µg/L2025-07-15WTP EFFLUENT / 0410005801
NFDHA< 0.02 µg/L0.02 µg/L2025-07-15WTP EFFLUENT / 0410005801
NMeFOSAA< 0.006 µg/L0.006 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFBA< 0.005 µg/L0.005 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFBS< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFDA< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFDoA< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFEESA< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFHpA< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFHpS< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFHxA< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFHxS< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFMBA< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFMPA< 0.004 µg/L0.004 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFNA< 0.004 µg/L0.004 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFOA< 0.004 µg/L0.004 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFOS< 0.004 µg/L0.004 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFPeA< 0.003 µg/L0.003 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFPeS< 0.004 µg/L0.004 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFTA< 0.008 µg/L0.008 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFTrDA< 0.007 µg/L0.007 µg/L2025-07-15WTP EFFLUENT / 0410005801
PFUnA< 0.002 µg/L0.002 µg/L2025-07-15WTP EFFLUENT / 0410005801
lithium< 9 µg/L9 µg/L2025-07-15WTP EFFLUENT / 0410005801

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) 0.0009 mg/L2023-01-01 – 2025-12-312026Q3
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
Lead (PB90) 0 mg/L2002-01-01 – 2004-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
PERFLUOROTRIDECANOIC ACID (PFTRDA)< 2.000000000 NG/L2026-06-18WELL 10-01-GAC-INTERMEDIATE / California DDW laboratory results
CARBON, TOTAL1 MG/L2026-06-18TREATMENT PLANT-TREATED / California DDW laboratory results
PERFLUOROTETRADECANOIC ACID (PFTA)< 2.000000000 NG/L2026-06-18WELL 10-01-GAC-EFFLUENT / California DDW laboratory results
PERFLUOROCTANOIC ACID (PFOA)12 NG/L2026-06-18WELL 10-01 / California DDW laboratory results
NITRITE< 0.400000000 MG/L2026-06-18TREATMENT PLANT-TREATED / California DDW laboratory results
PERFLUORODODECANOIC ACID (PFDOA)< 2.000000000 NG/L2026-06-18WELL 10-01 / California DDW laboratory results
ADONA< 2.000000000 NG/L2026-06-18WELL 10-01-GAC-EFFLUENT / California DDW laboratory results
PERFLUOROHEXANOIC ACID (PFHXA)< 2.000000000 NG/L2026-06-18WELL 10-01-GAC-EFFLUENT / California DDW laboratory results
NMEFOSAA< 5.000000000 NG/L2026-06-18WELL 10-01 / California DDW laboratory results
CHLORIDE5.9 MG/L2026-06-18TREATMENT PLANT-TREATED / California DDW laboratory results
SULFATE1.9 MG/L2026-06-18TREATMENT PLANT-TREATED / California DDW laboratory results
PERFLUOROHEXANE SULFONIC ACID (PFHxS)< 2.000000000 NG/L2026-06-18WELL 10-01-GAC-EFFLUENT / 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

1 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
Revised Total Coliform Rule / Monitoring, Routine (RTCR)2022-01-01 – 2022-01-31ResolvedNo2026Q3

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)

Henrie, Tarrah: 408-367-8490

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