Lake Arrowhead Csd

Published drinking-water records and contacts for Lake Arrowhead Csd. System CA3610005. Review sources and dates; not a real-time water assessment.

System ID: CA3610005
State or territory: CA
Published population served: 7038
System type (source code): CWS

Published records and dates

PFAS / lithium (EPA UCMR 5): 240 — 2023-02-07 – 2024-07-10
Lead and copper monitoring summaries: 45 — 1992-07-01 – 2026-12-31
California DDW laboratory results: 690 — 2026-01-07 – 2026-07-08

Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.

Read the provider’s annual water quality report

Report link listed: 2026-10-05. This is not the report’s sampling date.

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	2024-07-10	Cedar Glen TP / EP004
4:2 FTS	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
6:2 FTS	< 0.005 µg/L	0.005 µg/L	2024-07-10	Cedar Glen TP / EP004
8:2 FTS	< 0.005 µg/L	0.005 µg/L	2024-07-10	Cedar Glen TP / EP004
9Cl-PF3ONS	< 0.002 µg/L	0.002 µg/L	2024-07-10	Cedar Glen TP / EP004
ADONA	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
HFPO-DA	< 0.005 µg/L	0.005 µg/L	2024-07-10	Cedar Glen TP / EP004
NEtFOSAA	< 0.005 µg/L	0.005 µg/L	2024-03-06	Cedar Glen TP / EP004
NFDHA	< 0.02 µg/L	0.02 µg/L	2024-07-10	Cedar Glen TP / EP004
NMeFOSAA	< 0.006 µg/L	0.006 µg/L	2024-03-06	Cedar Glen TP / EP004
PFBA	< 0.005 µg/L	0.005 µg/L	2024-07-10	Cedar Glen TP / EP004
PFBS	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFDA	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFDoA	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFEESA	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFHpA	0.0044 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFHpS	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFHxA	0.0048 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFHxS	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFMBA	< 0.003 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFMPA	< 0.004 µg/L	0.004 µg/L	2024-07-10	Cedar Glen TP / EP004
PFNA	< 0.004 µg/L	0.004 µg/L	2024-07-10	Cedar Glen TP / EP004
PFOA	0.011 µg/L	0.004 µg/L	2024-07-10	Cedar Glen TP / EP004
PFOS	0.0050 µg/L	0.004 µg/L	2024-07-10	Cedar Glen TP / EP004
PFPeA	0.0037 µg/L	0.003 µg/L	2024-07-10	Cedar Glen TP / EP004
PFPeS	< 0.004 µg/L	0.004 µg/L	2024-07-10	Cedar Glen TP / EP004
PFTA	< 0.008 µg/L	0.008 µg/L	2024-03-06	Cedar Glen TP / EP004
PFTrDA	< 0.007 µg/L	0.007 µg/L	2024-03-06	Cedar Glen TP / EP004
PFUnA	< 0.002 µg/L	0.002 µg/L	2024-07-10	Cedar Glen TP / EP004
lithium	< 9 µg/L	9 µg/L	2024-03-06	Cedar Glen TP / EP004

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)	2023-01-01 – 2023-12-31	2026Q3
Lead (PB90)	2023-01-01 – 2023-12-31	2026Q3
Lead (PB90)	2022-07-01 – 2022-12-31	2026Q3
Lead (PB90)	2022-01-01 – 2022-12-31	2026Q3
Lead (PB90)	2022-01-01 – 2022-06-30	2026Q3
Lead (PB90)	2021-01-01 – 2021-12-31	2026Q3
Lead (PB90)	2020-01-01 – 2020-12-31	2026Q3

Twelve most recent imported state laboratory records
Substance	Published result	Sample date	Location / source
GROSS ALPHA PARTICLE ACTIVITY	15 PCI/L	2026-07-08	WELL 05 / California DDW laboratory results
GROSS ALPHA PARTICLE ACTIVITY	51 PCI/L	2026-07-08	WELL 08 / California DDW laboratory results
COMBINED URANIUM	89 PCI/L	2026-07-08	WELL 02 / California DDW laboratory results
COMBINED URANIUM	94 PCI/L	2026-07-08	WELL 01 / California DDW laboratory results
GROSS ALPHA PARTICLE ACTIVITY	46 PCI/L	2026-07-08	WELL 02 / California DDW laboratory results
COMBINED URANIUM	28 PCI/L	2026-07-08	WELL 05 / California DDW laboratory results
COMBINED URANIUM	42 PCI/L	2026-07-08	WELL 08 / California DDW laboratory results
GROSS ALPHA PARTICLE ACTIVITY	69 PCI/L	2026-07-08	WELL 01 / California DDW laboratory results
CARBON, TOTAL	2.2 MG/L	2026-07-01	BERNINA TRMT PLANT - LACSD TREATED / California DDW laboratory results
CARBON, TOTAL	2.8 MG/L	2026-07-01	BERNINA INTAKE - LACSD RAW / California DDW laboratory results
COMBINED URANIUM	< 1.000000000 PCI/L	2026-07-01	IX VESSEL 1 EFFLUENT / California DDW laboratory results
GROSS ALPHA PARTICLE ACTIVITY	< 3.000000000 PCI/L	2026-07-01	IX VESSEL 2 EFFLUENT / 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)

Gross, Ryan: 909-336-7102

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