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Revised OWTS Manual – May 21, 2019

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The Onsite Waste Treatment Systems (OWTS) Manual provides the regulations, procedural and technical details governing individual onsite wastewater treatment systems (also referred to as septic systems). State law mandates the State Water Resources Control Board (State Water Board) adopt standards for regulation of onsite waste treatment systems ( State Water Board OWTS Policy). The OWTS Manual complies with the State Water Resources Control Board OWTS Policy Tier 2 Local Area Management Program (LAMP) requirements.

Below is the proposed OWTS Manual that was considered by the Board of Supervisors on May 21, 2019. It incorporates feedback from the public.

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May 21, 2019 Version

Full Portfolio Version (PDF Portfolio: 9.02 MB)

The individual PDFs that are listed below, combined into a single Adobe Portfolio file. (Requires Adobe Flash installation to view.)

Revised Sections (Accessible)

Alternate version divided into separate sections in separate PDF files. All documents are in PDF format and fewer than 200 kB in size unless otherwise noted.