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Last modified: 1/15/2013 3:37 PM

HMCD is the local agency that regulates toxic gases in the following geographic areas: within the Cities of Los Altos Hills, Monte Sereno, and Saratoga; Moffett Field; San Martin; Stanford; and unincorporated areas of Santa Clara County.  In addition, HMCD handles County owned/operated facilities regardless of location. Agency program responsibilities and contact information for other areas within Santa Clara County can be found by clicking here:

  HMCD is a founding member and supporter of the Unidocs website and online hazardous materials inventory management project. Many of the forms and guidance documents available through our own EHinfo website are Unidocs documents, which are identified by the Unidocs logo.


(Alphabetical by Title)

Document Number





Common Toxic Gases as Defined by the Toxic Gas Ordinance and California Fire Code

List of toxic gases commonly found in Silicon Valley. (Note: Not a complete list of all toxic gases.)


Silane Gas Installation Supplement


This form must accompany silane gas system installation/upgrade plan submittals.


Toxic Gas Installation Application

This form must be completed and accompany plan submittals associated with the construction/upgrade of facilities/areas regulated by the Toxic Gas Ordinance (TGO).


Toxic Gas Ordinance Consensus Guidelines


Guidelines developed to improve consistency in interpretation and implementation of the Model Toxic Gas Ordinance.


Toxic Gas Ordinance Field Guide/Checklist


This form should be completed by contractors or facility owners/operators prior to scheduling TGO inspections.