An independent public resourceEnglish Español
PublicWater Watch

Great Oaks Wc Inc

Published drinking-water records and contacts for Great Oaks Wc Inc. System CA4310022. Review sources and dates; not a real-time water assessment.

System ID
CA4310022
State or territory
CA
Published population served
110088
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/L2025-12-17Well 21 / 4310022018
4:2 FTS< 0.003 µg/L0.003 µg/L2025-12-17Well 7 / 4310022006
6:2 FTS< 0.005 µg/L0.005 µg/L2025-12-17Well 24B / 4310022029
8:2 FTS< 0.005 µg/L0.005 µg/L2025-12-17Well 22 / 4310022021
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2025-12-17Well 8 / 4310022007
ADONA< 0.003 µg/L0.003 µg/L2025-12-17Well 22 / 4310022021
HFPO-DA< 0.005 µg/L0.005 µg/L2025-12-17Well 24 / 4310022023
NEtFOSAA< 0.005 µg/L0.005 µg/L2025-12-17Well 16 / 4310022026
NFDHA< 0.02 µg/L0.02 µg/L2025-12-17Well 7 / 4310022006
NMeFOSAA< 0.006 µg/L0.006 µg/L2025-12-17Well 4 / 4310022004
PFBA< 0.005 µg/L0.005 µg/L2025-12-17Well 24C / 4310022030
PFBS< 0.003 µg/L0.003 µg/L2025-12-17Well 4 / 4310022004
PFDA< 0.003 µg/L0.003 µg/L2025-12-17Well 24A / 4310022028
PFDoA< 0.003 µg/L0.003 µg/L2025-12-17Well 23 / 4310022022
PFEESA< 0.003 µg/L0.003 µg/L2025-12-17Well 24C / 4310022030
PFHpA< 0.003 µg/L0.003 µg/L2025-12-17Well 24B / 4310022029
PFHpS< 0.003 µg/L0.003 µg/L2025-12-17Well 23A / 4310022027
PFHxA< 0.003 µg/L0.003 µg/L2025-12-17Well 10 / 4310022009
PFHxS< 0.003 µg/L0.003 µg/L2025-12-17Well 7 / 4310022006
PFMBA< 0.003 µg/L0.003 µg/L2025-12-17Well 8 / 4310022007
PFMPA< 0.004 µg/L0.004 µg/L2025-12-17Well 2 / 4310022002
PFNA< 0.004 µg/L0.004 µg/L2025-12-17Well 7 / 4310022006
PFOA< 0.004 µg/L0.004 µg/L2025-12-17Well 24C / 4310022030
PFOS< 0.004 µg/L0.004 µg/L2025-12-17Well 16 / 4310022026
PFPeA< 0.003 µg/L0.003 µg/L2025-12-17Well 23A / 4310022027
PFPeS< 0.004 µg/L0.004 µg/L2025-12-17Well 11 / 4310022010
PFTA< 0.008 µg/L0.008 µg/L2025-12-17Well 16 / 4310022026
PFTrDA< 0.007 µg/L0.007 µg/L2025-12-17Well 24B / 4310022029
PFUnA< 0.002 µg/L0.002 µg/L2025-12-17Well 4 / 4310022004
lithium14.5 µg/L9 µg/L2025-12-17Well 4 / 4310022004

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) 0.0012 mg/L2018-01-01 – 2020-12-312026Q3
Lead (PB90) 0.0044 mg/L2015-01-01 – 2017-12-312026Q3
Lead (PB90) 0.004 mg/L2012-01-01 – 2014-12-312026Q3
Lead (PB90) 0.0029 mg/L2011-01-01 – 2013-12-312026Q3
Lead (PB90) 0 mg/L2008-01-01 – 2010-12-312026Q3
Lead (PB90) 0.005 mg/L2005-01-01 – 2007-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
BROMOFORM3.23 UG/L2026-06-08DBPR Sample / California DDW laboratory results
CHLOROFORM< 1.000000000 UG/L2026-06-08DBPR Sample / California DDW laboratory results
BROMODICHLOROMETHANE< 1.000000000 UG/L2026-06-08DBPR Sample / California DDW laboratory results
DIBROMOACETIC ACID1.3 UG/L2026-06-08DBPR Sample / California DDW laboratory results
BROMODICHLOROMETHANE< 1.000000000 UG/L2026-06-08DBPR Sample / California DDW laboratory results
BROMOFORM2.20 UG/L2026-06-08DBPR Sample / California DDW laboratory results
MONOBROMOACETIC ACID< 1.000000000 UG/L2026-06-08DBPR Sample / California DDW laboratory results
CHLOROFORM< 1.000000000 UG/L2026-06-08DBPR Sample / California DDW laboratory results
TOTAL HALOACETIC ACIDS (HAA5)1.2 UG/L2026-06-08DBPR Sample / California DDW laboratory results
CHLOROFORM< 1.000000000 UG/L2026-06-08DBPR Sample / California DDW laboratory results
MONOCHLOROACETIC ACID< 2.000000000 UG/L2026-06-08DBPR Sample / California DDW laboratory results
TRICHLOROACETIC ACID< 1.000000000 UG/L2026-06-08DBPR 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

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)

Roeder, John: 408-227-9540

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