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 – April 27, 2018
The revised OWTS Manual that is being considered.
Entire Document (PDF: 7.84 MB)
Revised 2018 document provided in a single file.
Multiple File Version
Revised 2018 document divided into separate files for each section.
Original 2016 version, with new 2018 changes added and the superseded/removed content struck out. The document is divided into separate files for each section.
Revised Local Area Management Program (LAMP) – April 27, 2018
The revised LAMP that is being considered.
Revised LAMP (PDF: 801 kB)
Current OWTS Manual – September 22, 2016
The OWTS Manual that is currently in effect and will be replaced.
Current Manual (PDF: 9.7 MB)