Public Water Partners

ATHERTON, CA · San Mateo County

MENLO COLLEGE Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of August 3, 2015. 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 Mateo 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)
CA4100517
System type
Community Water System
Population served
850
Service connections
15
Ownership
privately owned
Water source
groundwater (wells)

MENLO COLLEGE is one of 728 community water systems in California in the 501 to 3,300 people size category, formerly serving 850 people from groundwater.

EPA's federal records list this system as inactive in 2015; the record below is historical.

As of August 1, 2026, its federal record holds 35 entries between 1980 and 2005, all of which EPA lists as closed. Nothing has been added since 2005.

Of the 35, 34 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 synthetic organic chemicals, volatile organic chemicals, and the Radionuclides and Revised Rad Rule.

Violation history

  • Follow-up Or Routine LCR Tap M/R

    —

    Lead and Copper Rule

    January 1, 2005 – August 3, 2015

    Archived

  • Monitoring, Regular

    —

    Tetrachloroethylene

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    1,1,1-Trichloroethane

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    1,1,2-Trichloroethane

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    trans-1,2-Dichloroethylene

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Styrene

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    2,3,7,8-TCDD

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Endothall

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Simazine

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Endrin

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Total Polychlorinated Biphenyls (PCB)

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Picloram

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    2,4-D

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Diquat

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2004 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Ethylbenzene

    January 1, 2004 – December 31, 2004

    Archived

  • Notification, Public

    —

    No contaminant on record

    October 1, 1982 – October 31, 1982

    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)

Enforcement actions

No enforcement actions on record for this system.

Last known contact on file (system is inactive)

TALBOT, BOB

650-543-3714

ATHERTON, CA 94027