City of Cotati

Published drinking-water records and contacts for City of Cotati. System CA4910016. Review sources and dates; not a real-time water assessment.

System ID: CA4910016
State or territory: CA
Published population served: 7303
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 300 — 2024-03-05 – 2024-09-09
Lead and copper monitoring summaries: 41 — 1992-07-01 – 2026-12-31
California DDW laboratory results: 146 — 2026-01-02 – 2026-06-23

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	2024-09-09	SCWA Cypress Turn Out / EP4
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2024-09-09	SCWA La Salle Turn Out / EP5
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2024-09-09	Well 2 / EP2
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2024-09-09	Well 3 / EP3
ADONA	< 0.003 µg/L	0.003 µg/L	2024-09-09	Well 3 / EP3
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2024-09-09	Well 2 / EP2
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2024-09-09	Well 1A / EP1
NFDHA	< 0.02 µg/L	0.02 µg/L	2024-09-09	SCWA La Salle Turn Out / EP5
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2024-09-09	Well 3 / EP3
PFBA	< 0.005 µg/L	0.005 µg/L	2024-09-09	Well 3 / EP3
PFBS	< 0.003 µg/L	0.003 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFDA	< 0.003 µg/L	0.003 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFDoA	< 0.003 µg/L	0.003 µg/L	2024-09-09	Well 3 / EP3
PFEESA	< 0.003 µg/L	0.003 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFHpA	< 0.003 µg/L	0.003 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFHpS	< 0.003 µg/L	0.003 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFHxA	< 0.003 µg/L	0.003 µg/L	2024-09-09	SCWA La Salle Turn Out / EP5
PFHxS	< 0.003 µg/L	0.003 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFMBA	< 0.003 µg/L	0.003 µg/L	2024-09-09	Well 1A / EP1
PFMPA	< 0.004 µg/L	0.004 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFNA	< 0.004 µg/L	0.004 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFOA	< 0.004 µg/L	0.004 µg/L	2024-09-09	Well 3 / EP3
PFOS	< 0.004 µg/L	0.004 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
PFPeA	< 0.003 µg/L	0.003 µg/L	2024-09-09	Well 1A / EP1
PFPeS	< 0.004 µg/L	0.004 µg/L	2024-09-09	Well 2 / EP2
PFTA	< 0.008 µg/L	0.008 µg/L	2024-09-09	Well 1A / EP1
PFTrDA	< 0.007 µg/L	0.007 µg/L	2024-09-09	Well 2 / EP2
PFUnA	< 0.002 µg/L	0.002 µg/L	2024-09-09	SCWA Cypress Turn Out / EP4
lithium	< 9 µg/L	9 µg/L	2024-09-09	SCWA La Salle Turn Out / EP5

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)	2024-01-01 – 2026-12-31	2026Q3
Lead (PB90)	2021-01-01 – 2023-12-31	2026Q3
Lead (PB90)	2018-01-01 – 2020-12-31	2026Q3
Lead (PB90)	2015-01-01 – 2017-12-31	2026Q3
Lead (PB90)	2014-01-01 – 2016-12-31	2026Q3
Lead (PB90)	2011-01-01 – 2013-12-31	2026Q3
Lead (PB90)	2008-01-01 – 2010-12-31	2026Q3
Lead (PB90)	2005-01-01 – 2007-12-31	2026Q3

Twelve most recent imported state laboratory records
Substance	Published result	Sample date	Location / source
NMEFOSAA	< 1.900000000 NG/L	2026-06-23	WELL 03 / California DDW laboratory results
ADONA	< 1.900000000 NG/L	2026-06-23	WELL 03 / California DDW laboratory results
PERFLUOROTETRADECANOIC ACID (PFTA)	< 1.900000000 NG/L	2026-06-23	WELL 03 / California DDW laboratory results
NETFOSAA	< 1.800000000 NG/L	2026-06-23	WELL 01A / California DDW laboratory results
HFPO-DA	< 1.900000000 NG/L	2026-06-23	WELL 03 / California DDW laboratory results
ADONA	< 1.800000000 NG/L	2026-06-23	WELL 01A / California DDW laboratory results
PERFLUORONONANOIC ACID (PFNA)	< 1.900000000 NG/L	2026-06-23	WELL 03 / California DDW laboratory results
11CL-PF3OUDS	< 1.800000000 NG/L	2026-06-23	WELL 01A / California DDW laboratory results
PERFLUOROHEXANE SULFONIC ACID (PFHxS)	< 1.900000000 NG/L	2026-06-23	WELL 03 / California DDW laboratory results
PERFLUORODECANOIC ACID (PFDA)	< 1.800000000 NG/L	2026-06-23	WELL 01A / California DDW laboratory results
PERFLUOROTETRADECANOIC ACID (PFTA)	< 1.800000000 NG/L	2026-06-23	WELL 01A / California DDW laboratory results
HFPO-DA	< 1.800000000 NG/L	2026-06-23	WELL 01A / 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: 2026-10-18

Administrative contact (EPA filing)

Scott, Craig: 707-665-3620

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