Sweetwater Springs Cwd - Guerneville

Published drinking-water records and contacts for Sweetwater Springs Cwd - Guerneville. System CA4910004. Review sources and dates; not a real-time water assessment.

System ID: CA4910004
State or territory: CA
Published population served: 6000
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 60 — 2025-05-13 – 2025-11-19
Lead and copper monitoring summaries: 30 — 1992-07-01 – 2025-12-31
California DDW laboratory results: 147 — 2026-01-06 – 2026-06-02

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	2025-11-19	Highland Treatment Plant / EP005
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-11-19	Highland Treatment Plant / EP005
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2025-11-19	Highland Treatment Plant / EP005
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2025-11-19	Highland Treatment Plant / EP005
ADONA	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2025-11-19	Highland Treatment Plant / EP005
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2025-11-19	Highland Treatment Plant / EP005
NFDHA	< 0.02 µg/L	0.02 µg/L	2025-11-19	Highland Treatment Plant / EP005
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFBA	< 0.005 µg/L	0.005 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFBS	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFDA	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFDoA	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFEESA	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFHpA	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFHpS	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFHxA	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFHxS	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFMBA	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFMPA	< 0.004 µg/L	0.004 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFNA	< 0.004 µg/L	0.004 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFOA	< 0.004 µg/L	0.004 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFOS	< 0.004 µg/L	0.004 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFPeA	< 0.003 µg/L	0.003 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFPeS	< 0.004 µg/L	0.004 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFTA	< 0.008 µg/L	0.008 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFTrDA	< 0.007 µg/L	0.007 µg/L	2025-11-19	Highland Treatment Plant / EP005
PFUnA	< 0.002 µg/L	0.002 µg/L	2025-11-19	Highland Treatment Plant / EP005
lithium	< 9 µg/L	9 µg/L	2025-11-19	Highland Treatment Plant / EP005

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)	2011-01-01 – 2013-12-31	2026Q3
Lead (PB90)	2010-01-01 – 2012-12-31	2026Q3
Lead (PB90)	2008-01-01 – 2010-12-31	2026Q3
Lead (PB90)	2007-01-01 – 2007-12-31	2026Q3

Twelve most recent imported state laboratory records
Substance	Published result	Sample date	Location / source
MANGANESE	0.32 UG/L	2026-06-02	TREATMENT PLANT - HIGHLAND TANK - CL2 / California DDW laboratory results
IRON	< 68.000000000 UG/L	2026-06-02	TREATMENT PLANT - HIGHLAND TANK - CL2 / California DDW laboratory results
MANGANESE	0.16 UG/L	2026-05-05	TREATMENT PLANT - HIGHLAND TANK - CL2 / California DDW laboratory results
IRON	< 68.000000000 UG/L	2026-05-05	TREATMENT PLANT - HIGHLAND TANK - CL2 / California DDW laboratory results
PERFLUORODODECANOIC ACID (PFDOA)	< 1.800000000 NG/L	2026-04-22	EL BONITA WELL 06 / California DDW laboratory results
PERFLUOROCTANE SULFONIC ACID (PFOS)	< 1.900000000 NG/L	2026-04-22	EL BONITA WELL 04 / California DDW laboratory results
NMEFOSAA	< 1.800000000 NG/L	2026-04-22	EL BONITA WELL 06 / California DDW laboratory results
9CL-PF3ONS	< 1.800000000 NG/L	2026-04-22	EL BONITA WELL 05 / California DDW laboratory results
PERFLUOROTETRADECANOIC ACID (PFTA)	< 1.800000000 NG/L	2026-04-22	EL BONITA WELL 06 / California DDW laboratory results
11CL-PF3OUDS	< 1.800000000 NG/L	2026-04-22	EL BONITA WELL 05 / California DDW laboratory results
PERFLUOROCTANOIC ACID (PFOA)	< 1.800000000 NG/L	2026-04-22	EL BONITA WELL 06 / California DDW laboratory results
HFPO-DA	< 1.900000000 NG/L	2026-04-22	EL BONITA WELL 04 / 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)

Schanz, Eric: 707-869-4000

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