THOUSAND OAKS, CA · San Luis Obispo County

DOUBLE J MOBILE ESTATES Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of May 23, 2003. 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 San Luis Obispo County, CA.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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): CA4000646
System type: Community Water System
Population served: 43
Service connections: 24
Ownership: privately owned
Water source: groundwater (wells)

DOUBLE J MOBILE ESTATES is one of 3,951 community water systems in California in the 500 or fewer people size category, formerly serving 43 people from groundwater.

EPA's federal records list this system as inactive in 2003; the record below is historical.

As of August 1, 2026, its federal record holds 20 entries between 1979 and 1984, all of which EPA lists as closed. Nothing has been added since 1984.

Of the 20, 2 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves inorganic chemicals, the Miscellaneous Other Rules, and the Radionuclides and Revised Rad Rule.

Violation history

Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
September 1, 1984 – September 30, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
August 1, 1984 – August 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
July 1, 1984 – July 31, 1984
Archived
Notification, Public
—
No contaminant on record
June 1, 1984 – June 30, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
May 1, 1984 – May 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
April 1, 1984 – April 30, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
March 1, 1984 – March 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
January 1, 1984 – January 31, 1984
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
December 1, 1983 – December 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
November 1, 1983 – November 30, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
October 1, 1983 – October 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
August 1, 1983 – August 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
July 1, 1983 – July 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
March 1, 1983 – March 31, 1983
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
December 1, 1982 – December 31, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
November 1, 1982 – November 30, 1982
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Selenium
October 1, 1982 – October 31, 1982
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
Archived
Notification, Public
—
No contaminant on record
May 30, 1980 – June 29, 1980
Archived
Monitoring, Check/Repeat/Confirmation
—
Selenium
June 1, 1979 – May 31, 1983
Archived

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

Period	Violation	Contaminant / rule	Health-based	Status
September 1, 1984 – September 30, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
August 1, 1984 – August 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
July 1, 1984 – July 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
June 1, 1984 – June 30, 1984	Notification, Public	—	—	Archived
May 1, 1984 – May 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
April 1, 1984 – April 30, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
March 1, 1984 – March 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
January 1, 1984 – January 31, 1984	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
December 1, 1983 – December 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
November 1, 1983 – November 30, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
October 1, 1983 – October 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
August 1, 1983 – August 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
July 1, 1983 – July 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
March 1, 1983 – March 31, 1983	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
December 1, 1982 – December 31, 1982	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
November 1, 1982 – November 30, 1982	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
October 1, 1982 – October 31, 1982	Maximum Contaminant Level Violation, Single Sample	Selenium	Health-based	Archived
October 1, 1981 – September 30, 1982	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived
May 30, 1980 – June 29, 1980	Notification, Public	—	—	Archived
June 1, 1979 – May 31, 1983	Monitoring, Check/Repeat/Confirmation	Selenium	—	Archived

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

Enforcement actions

No enforcement actions on record for this system.

Last known contact on file (system is inactive)

Not on record

Phone not on record

THOUSAND OAKS, CA 91360