The Onsite Waste Treatment Systems (OWTS) Manual provides the policy, 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 ( OWTS Policy). The OWTS Manual complies with the State Water Resources Control Board OWTS Policy Tier 2 Local Area Management Program (LAMP) requirements.
Revised OWTS Manual – August 31, 2018
The currently proposed OWTS Manual dated August 31, 2018 incorporates feedback from the public and Board of Supervisors at the May 22, 2018 Board meeting and subsequent meetings with the Board of Supervisors Ad Hoc Committee. The strike outs and underlines in the August 31, 2018 version are relative to the April/May version presented to the Board of Supervisors at the May 22, 2018 meeting.
A summary of each of the sections of the revised OWTS Manual.
Accessible version in a single file with no strikethroughs.
Alternate version divided into sections with strikethroughs.
Current OWTS Manual – September 22, 2016
The OWTS Manual that is currently in effect and will be replaced.
Current Manual (PDF: 9.7 MB)