Town of Windsor

Published drinking-water records and contacts for Town of Windsor. System CA4910017. Review sources and dates; not a real-time water assessment.

System ID: CA4910017
State or territory: CA
Published population served: 25561
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 120 — 2025-01-08 – 2025-07-16
Lead and copper monitoring summaries: 37 — 1992-01-01 – 2025-12-31
California DDW laboratory results: 40 — 2026-03-04 – 2026-03-18

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
Substance	Published result	Reporting limit	Sample date	Sampling location
11Cl-PF3OUdS	< 0.005 µg/L	0.005 µg/L	2025-07-16	Well 7-11 Blend / EP02
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-07-16	Well 7-11 Blend / EP02
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-07-16	Well 7-11 Blend / EP02
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2025-07-16	Well 7-11 Blend / EP02
ADONA	< 0.003 µg/L	0.003 µg/L	2025-07-16	Well 7-11 Blend / EP02
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2025-07-16	Well 7-11 Blend / EP02
NFDHA	< 0.02 µg/L	0.02 µg/L	2025-07-16	Well 7-11 Blend / EP02
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFBA	< 0.005 µg/L	0.005 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFBS	< 0.003 µg/L	0.003 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFDA	< 0.003 µg/L	0.003 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFDoA	< 0.003 µg/L	0.003 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFEESA	< 0.003 µg/L	0.003 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFHpA	< 0.003 µg/L	0.003 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFHpS	< 0.003 µg/L	0.003 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFHxA	< 0.003 µg/L	0.003 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFHxS	< 0.003 µg/L	0.003 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFMBA	< 0.003 µg/L	0.003 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFMPA	< 0.004 µg/L	0.004 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFNA	< 0.004 µg/L	0.004 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFOA	< 0.004 µg/L	0.004 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFOS	< 0.004 µg/L	0.004 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFPeA	< 0.003 µg/L	0.003 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFPeS	< 0.004 µg/L	0.004 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFTA	< 0.008 µg/L	0.008 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01
PFTrDA	< 0.007 µg/L	0.007 µg/L	2025-07-16	Well 7-11 Blend / EP02
PFUnA	< 0.002 µg/L	0.002 µg/L	2025-07-16	Well 7-11 Blend / EP02
lithium	< 9 µg/L	9 µg/L	2025-07-16	Sonoma Co. Water Intertie / EP01

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
Substance	Monitoring period	Source quarter
Lead (PB90)	2023-01-01 – 2025-12-31	2026Q3
Lead (PB90)	2020-01-01 – 2022-12-31	2026Q3
Lead (PB90)	2017-01-01 – 2019-12-31	2026Q3
Lead (PB90)	2014-01-01 – 2016-12-31	2026Q3
Lead (PB90)	2012-01-01 – 2014-12-31	2026Q3
Lead (PB90)	2008-01-01 – 2010-12-31	2026Q3
Lead (PB90)	2005-01-01 – 2007-12-31	2026Q3
Lead (PB90)	2007-01-01 – 2007-12-31	2026Q3

Twelve most recent imported state laboratory records
Substance	Published result	Sample date	Location / source
ODOR	< 1.000000000 TON	2026-03-18	WELL 08 / California DDW laboratory results
OXAMYL	< 20.000000000 UG/L	2026-03-11	WELL 08 / California DDW laboratory results
CARBOFURAN	< 5.000000000 UG/L	2026-03-11	WELL 08 / California DDW laboratory results
FOAMING AGENTS (SURFACTANTS)	< 0.050000000 MG/L	2026-03-04	WELL 08 / California DDW laboratory results
SILVER	< 10.000000000 UG/L	2026-03-04	WELL 08 / California DDW laboratory results
DIQUAT	< 4.000000000 UG/L	2026-03-04	WELL 08 / California DDW laboratory results
TDS	250 MG/L	2026-03-04	WELL 08 / California DDW laboratory results
LASSO	< 1.000000000 UG/L	2026-03-04	WELL 08 / California DDW laboratory results
CONDUCTIVITY @ 25 C UMHOS/CM	340 UMHO/CM	2026-03-04	WELL 08 / California DDW laboratory results
PICLORAM	< 1.000000000 UG/L	2026-03-04	WELL 08 / California DDW laboratory results
HYDROXIDE AS CALCIUM CARBONATE	< 5.000000000 MG/L	2026-03-04	WELL 08 / California DDW laboratory results
PH	7.45 PH	2026-03-04	WELL 08 / 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.

EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
California DDW laboratory results — last successful check: 2026-10-17

Administrative contact (EPA filing)

Cave, Michael: 707-838-5309

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