An independent public resourceEnglish Español
PublicWater Watch

Diablo Water District

Published drinking-water records and contacts for Diablo Water District. System CA0710007. Review sources and dates; not a real-time water assessment.

System ID
CA0710007
State or territory
CA
Published population served
43357
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/L2023-12-01Blend Facility / 0710007007
4:2 FTS< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
6:2 FTS< 0.005 µg/L0.005 µg/L2023-12-01Blend Facility / 0710007007
8:2 FTS< 0.005 µg/L0.005 µg/L2023-12-01Blend Facility / 0710007007
9Cl-PF3ONS< 0.002 µg/L0.002 µg/L2023-12-01Blend Facility / 0710007007
ADONA< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
HFPO-DA< 0.005 µg/L0.005 µg/L2023-12-01Blend Facility / 0710007007
NEtFOSAA< 0.005 µg/L0.005 µg/L2023-12-01Blend Facility / 0710007007
NFDHA< 0.02 µg/L0.02 µg/L2023-12-01Blend Facility / 0710007007
NMeFOSAA< 0.006 µg/L0.006 µg/L2023-12-01Blend Facility / 0710007007
PFBA< 0.005 µg/L0.005 µg/L2023-12-01Blend Facility / 0710007007
PFBS< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFDA< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFDoA< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFEESA< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFHpA< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFHpS< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFHxA< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFHxS< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFMBA< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFMPA< 0.004 µg/L0.004 µg/L2023-12-01Blend Facility / 0710007007
PFNA< 0.004 µg/L0.004 µg/L2023-12-01Blend Facility / 0710007007
PFOA< 0.004 µg/L0.004 µg/L2023-12-01Blend Facility / 0710007007
PFOS< 0.004 µg/L0.004 µg/L2023-12-01Blend Facility / 0710007007
PFPeA< 0.003 µg/L0.003 µg/L2023-12-01Blend Facility / 0710007007
PFPeS< 0.004 µg/L0.004 µg/L2023-12-01Blend Facility / 0710007007
PFTA< 0.008 µg/L0.008 µg/L2023-12-01Blend Facility / 0710007007
PFTrDA< 0.007 µg/L0.007 µg/L2023-12-01Blend Facility / 0710007007
PFUnA< 0.002 µg/L0.002 µg/L2023-12-01Blend Facility / 0710007007
lithium< 9 µg/L9 µg/L2023-12-01Blend Facility / 0710007007

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) 0.0019 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/L2007-01-01 – 2007-12-312026Q3
Lead (PB90) 0 mg/L2006-01-01 – 2006-12-312026Q3
Lead (PB90) 0.005 mg/L2006-01-01 – 2006-12-312026Q3
Twelve most recent imported state laboratory records
SubstancePublished resultSample dateLocation / source
PERFLUOROPENTANOIC ACID (PFPEA)< 1.800000000 NG/L2026-07-15GLEN PARK WELL / California DDW laboratory results
PERFLUORO PFEESA< 1.600000000 NG/L2026-07-15GLEN PARK WELL / California DDW laboratory results
PERFLUOROHEPTANESULFONIC ACID (PFHPS)< 1.700000000 NG/L2026-07-15GLEN PARK WELL / California DDW laboratory results
PERFLUORONONANOIC ACID (PFNA)< 1.800000000 NG/L2026-07-15STONECREEK WELL / California DDW laboratory results
PERFLUORODODECANOIC ACID (PFDOA)< 1.800000000 NG/L2026-07-15STONECREEK WELL / California DDW laboratory results
PERFLUOROCTANE SULFONIC ACID (PFOS)< 1.900000000 NG/L2026-07-15GLEN PARK WELL / California DDW laboratory results
PERFLUOROCTANE SULFONIC ACID (PFOS)< 1.800000000 NG/L2026-07-15STONECREEK WELL / California DDW laboratory results
PERFLUOROHEXANE SULFONIC ACID (PFHxS)< 1.600000000 NG/L2026-07-15STONECREEK WELL / California DDW laboratory results
PERFLUOROUNDECANOIC ACID (PFUNA)< 1.900000000 NG/L2026-07-15GLEN PARK WELL / California DDW laboratory results
ADONA< 1.800000000 NG/L2026-07-15STONECREEK WELL / California DDW laboratory results
PERFLUOROOCTANE SULFONIC ACID 6:2 FTS< 1.700000000 NG/L2026-07-15STONECREEK WELL / California DDW laboratory results
NMEFOSAA< 1.900000000 NG/L2026-07-15GLEN PARK WELL / 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)

Muelrath, Dan: 925-625-3798

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