PORTOLA VALLEY, CA

ARASTRADERO MUTUAL WATER COMPANY Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of June 9, 2009. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in CA.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace California’s official records. Always confirm current status with California before making decisions based on this information.

System facts

System ID (PWSID): CA4300804
System type: Community Water System
Population served: 0
Service connections: 13
Ownership: privately owned
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2001 – July 31, 2001
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 1999 – January 31, 1999
Archived
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 1998 – June 9, 2009
Archived
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 1997 – June 9, 2009
Archived
Notification, Public
—
No contaminant on record
September 1, 1984 – September 30, 1984
Archived
Notification, Public
—
No contaminant on record
August 1, 1984 – August 31, 1984
Archived
Notification, Public
—
No contaminant on record
July 1, 1984 – July 31, 1984
Archived
Notification, Public
—
No contaminant on record
May 1, 1984 – May 31, 1984
Archived
Notification, Public
—
No contaminant on record
March 1, 1984 – March 31, 1984
Archived
Notification, Public
—
No contaminant on record
February 1, 1984 – February 29, 1984
Archived
Notification, Public
—
No contaminant on record
December 1, 1983 – December 31, 1983
Archived
Notification, Public
—
No contaminant on record
October 1, 1983 – October 31, 1983
Archived
Notification, Public
—
No contaminant on record
September 1, 1983 – September 30, 1983
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 30, 1980 – October 29, 1981
Archived

Archived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2001 – July 31, 2001	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
January 1, 1999 – January 31, 1999	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
January 1, 1998 – June 9, 2009	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Archived
January 1, 1997 – June 9, 2009	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Archived
September 1, 1984 – September 30, 1984	Notification, Public	—	—	Archived
August 1, 1984 – August 31, 1984	Notification, Public	—	—	Archived
July 1, 1984 – July 31, 1984	Notification, Public	—	—	Archived
May 1, 1984 – May 31, 1984	Notification, Public	—	—	Archived
March 1, 1984 – March 31, 1984	Notification, Public	—	—	Archived
February 1, 1984 – February 29, 1984	Notification, Public	—	—	Archived
December 1, 1983 – December 31, 1983	Notification, Public	—	—	Archived
October 1, 1983 – October 31, 1983	Notification, Public	—	—	Archived
September 1, 1983 – September 30, 1983	Notification, Public	—	—	Archived
October 1, 1981 – September 30, 1982	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
October 30, 1980 – October 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Archived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

August 30, 2001State Administrative/Compliance Order without penalty issued1 linked violation
August 30, 2001State Public Notification received1 linked violation
August 30, 2001State Public Notification requested1 linked violation
August 24, 2001State Public Notification requested3 linked violations
August 24, 2001State Administrative/Compliance Order without penalty issued3 linked violations
August 24, 2001State Public Notification received3 linked violations
February 26, 2001State Violation/Reminder Notice4 linked violations
February 26, 2001State Public Notification received3 linked violations
February 26, 2001State Public Notification requested3 linked violations
February 25, 1999State Public Notification received3 linked violations

Last known contact on file (system is inactive)

Not on record

Phone not on record

PORTOLA VALLEY, CA 94020