Callahan Water District

Published drinking-water records and contacts for Callahan Water District. System CA4700503. Review sources and dates; not a real-time water assessment.

System ID: CA4700503
State or territory: CA
Published population served: 70
System type (source code): CWS

Published records and dates

Lead and copper monitoring summaries: 6 — 1993-07-01 – 2021-12-31
California DDW laboratory results: 50 — 2026-03-23 – 2026-06-17

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

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	Published 90th percentile	Monitoring period	Source quarter
Lead (PB90)	0 mg/L	2019-01-01 – 2021-12-31	2026Q3
Lead (PB90)	0 mg/L	2018-01-01 – 2020-12-31	2026Q3
Lead (PB90)	0.00261085 mg/L	2015-01-01 – 2017-12-31	2026Q3
Lead (PB90)	0 mg/L	2010-01-01 – 2012-12-31	2026Q3
Lead (PB90)	0 mg/L	1994-07-01 – 1994-12-31	2026Q3
Lead (PB90)	0 mg/L	1993-07-01 – 1993-12-31	2026Q3

Twelve most recent imported state laboratory records
Substance	Published result	Sample date	Location / source
PERFLUORONONANOIC ACID (PFNA)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUOROCTANOIC ACID (PFOA)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUOROPENTANOIC ACID (PFPEA)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUORO PFEESA	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUOROPENTANESULFONIC ACID (PFPES)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUOROHEPTANESULFONIC ACID (PFHPS)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUORODECANOIC ACID (PFDA)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUORODODECANOIC ACID (PFDOA)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
NONAFLUORO NFDHA	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
ADONA	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUOROUNDECANOIC ACID (PFUNA)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / California DDW laboratory results
PERFLUOROHEXANE SULFONIC ACID (PFHxS)	< 2.000000000 NG/L	2026-06-17	WEST BOULDER CREEK - RAW / 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

34 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.

Twenty most recent imported compliance records
Rule / record	Period	Recorded status	Health-based (EPA classification)	Source quarter
Lead and Copper Rule / Follow-up Or Routine LCR Tap M/R	2024-10-01 – —	Unaddressed	No	2026Q3
Consumer Confidence Rule / Consumer Confidence Report Complete Failure to Report	2018-07-01 – —	Resolved	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-09-01 – 1984-09-30	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-08-01 – 1984-08-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-07-01 – 1984-07-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-06-01 – 1984-06-30	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-05-01 – 1984-05-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-04-01 – 1984-04-30	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-03-01 – 1984-03-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-02-01 – 1984-02-29	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1984-01-01 – 1984-01-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-12-01 – 1983-12-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-11-01 – 1983-11-30	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-10-01 – 1983-10-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-09-01 – 1983-09-30	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-08-01 – 1983-08-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-07-01 – 1983-07-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-06-01 – 1983-06-30	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-05-01 – 1983-05-31	Archived	No	2026Q3
Miscellaneous Other Rules / Notification, Public	1983-04-01 – 1983-04-30	Archived	No	2026Q3

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)

Gilmore, Shirley: 530-467-3620

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