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Program Description

The primary responsibility of this program is reviewing and approving plans for Onsite Wastewater Treatments Systems within designated cities and unincorporated areas of the County of Los Angeles in an effort to protect groundwater sources. Program personnel also inspect and permit septic tank pumping vehicles, chemical toilet pumping vehicles, and toilet rental agencies. In addition, we are responsible for evaluating subdivision requests and conducting environmental reviews within its scope.


  • Review and approve plans for construction, renovation, expansion or repair of Onsite Wastewater Treatment Systems by conducting field inspections and reviewing soil evaluations, percolation test data, as well as historical records

  • Perform field inspections to assess parcel and tract maps, the feasibility of new land use proposals, conditional use permits, zone changes, etc., for the Department of Regional Planning

  • Conduct field inspections and record searches to provide assessments of existing Onsite Wastewater Treatment Systems

  • Inspect sewage cleaning vehicles, chemical toilet pumping vehicles and toilet rental agencies

  • Inspect recreational cabins within U.S. Forestry Service areas, when requested

Local Agency Management Plan

Draft LAMP and Professional Guide

The State Water Resources Control Board (SWRCB) prepared a Water Quality Control Policy for Siting, Design, Operation and Maintenance of Onsite Wastewater Treatment Systems, dated June 19, 2012, also referred to as the "OWTS Policy" (SWRCB, 2012). The SWRCB’s OWTS Policy provides a multi-tiered strategy for management of OWTS in California.

On May 13, 2016, the Department of Public Health, Environmental Health Division submitted a proposed Local Agency Management Program (LAMP) for oversight of onsite wastewater treatment systems (OWTS) within the unincorporated areas of the County of Los Angeles to the Los Angeles Regional Water Quality Control Board. This LAMP has been prepared in accordance with the requirements of the SWRCB "OWTS Policy" (SWRCB, 2012).

Environmental Health is making a draft copy of the LAMP, as well as a draft copy of the County’s revised Requirements and Procedures for Conventional and Non-Conventional Onsite Wastewater Treatment Systems, dated May 2016, (aka, Professional Guide) available for download for review by all interested parties at the links below. Due to the LAMP file’s size, approximately 13MB, it cannot be sent or received through our email system. Persons wishing to comment on either the LAMP or the Professional Guide may do so by submitting their written comments and questions to by August 13, 2016.

Applicability of the LAMP to Cities within Los Angeles County

Cities currently with an MOU with DPH for OWTS review and those desirous of having DPH’s Land Use Program review proposed OWTS must enter into a Memorandum of Understanding (MOU) with the Department of Public Health. In addition, cities will need to adopt the appropriate sections of the Los Angeles County Health and Safety Code (Title 11) and the Los Angeles County Plumbing Code (Title 28) to provide for the County’s enforcement of the LAMP’s provisions and restrictions. A proposed ordinance to change Title 11 and Title 28 to match the LAMP’s requirements is still under development.

Cities that are interested in entering a MOU may contact the Land Use Program at (626) 430-5380 for more information and to be added to a mailing list.

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Director of
Environmental Health
Terri S. Williams
Public Health has made reasonable efforts to provide accurate translation. However, no computerized translation is perfect and is not intended to replace traditional translation methods. If questions arise concerning the accuracy of the information, please refer to the English edition of the website, which is the official version.
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