Onsite Wastewater Treatment Systems

The Local Agency Management Program (LAMP) is the culmination of the actions required by Assembly Bill 885 (AB 885) which directed the State Water Resources Control Board (SWRCB) to develop regulations or standards for onsite wastewater treatment systems (Septic Treatment Systems) to be implemented by qualified local agencies. The SWRCB adopted the Water Quality Control Policy for Siting, Design, Operation, and Maintenance of Onsite Wastewater Treatment Systems on June 19, 2012 (OWTS Policy). The OWTS Policy allows local agencies, such as the County of San Luis Obispo, to permit and approve Septic Treatment Systems, based on a local ordinance, after approval of a LAMP by the Central Coast Regional Water Quality Control Board (Central Coast Water Board). 

The County of San Luis Obispo LAMP is designed to protect groundwater sources and surface water bodies from contamination through the proper design, placement, installation, maintenance, and assessment of individual Septic Treatment Systems. 

The LAMP develops minimum standards for the treatment and ultimate disposal of sewage though the use of Septic Treatment Systems in non-sewered unincorporated areas of San Luis Obispo County. The LAMP will also expand the ability of Planning & Building to permit and regulate alternative Septic Treatment Systems while protecting water quality and public health.


Please review the downloadable LAMP FAQs for a list of the most frequently asked questions regarding the LAMP.


Review the Proposed Final Lamp, Updated January 2018


The Department of Planning & Building invites public comment on the Proposed Final LAMP through February 28th, 2018. 

To submit comments, please e-mail:

  • Ann Gillespie, agillespie@co.slo.ca.us
  • Barry Tolle, btolle@co.slo.ca.us



LAMP Outreach Meetings

The County hosted two public outreach meetings in December 2017 to present the Proposed Final version of the LAMP. 

Monday, December 18th 5:00PM- 6:30PM
San Luis Obispo County New Government Center, 1055 Monterey Street, San Luis Obispo (Room 161)

Tuesday, December 19th 5:00PM-6:30PM
Atascadero Library 6555 Capistrano, Atascadero,
(Polin Community Room)