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The County of San Bernardino requires a home builder to either connect to an available sewer system, or if no sewer system is available, to construct an Onsite Wastewater Treatment System (OWTS), also known as a septic system. Septic systems have the potential to contaminate groundwater and create a nuisance. An improper septic system design or design rate could lead to premature system failure, degradation of groundwater and other forms of contamination. Therefore, the design and siting of a septic system is critical. In order to properly design a septic system a qualified professional must conduct a percolation test to determine the soil’s absorption rate. A qualified professional is a Registered Civil Engineer, Certified Engineering Geologist, Geotechnical Engineer, Registered Geologist, or Registered Environmental Health Specialist. DEHS will review all percolation reports submitted to evaluate the testing methods, calculations, and determined design rate.


Homeowner Resources

¿Dònde está mi Sistema Séptico?

EPA Septic System Information

Where is My Septic System?

Onsite Waste Water Disposal

How to Calculate for Design Rates, Absorption Area and Total Feet
For Engineers and other Percolation Testing/Septic System Designers

Minimum Setback and Location of Septic System

Minimum Setback List - Liquid Waste Disposal System

On-Site Waste Water Disposal System

Sizing Your Septic System
How to size your leachlines, infiltrators or pits

Local Area Management Plan (LAMP)

The Onsite Wastewater Treatment Systems Policy (OWTS) was created to meet the requirements of Assembly Bill (AB) 885 to promulgate consistent, statewide, standards for the regulation of OWTS. The policy was adopted by the State Water Board in June 2012, and became effective May 13, 2013. The LAMP provides minimum standards and requirements for the treatment and disposal of sewage through the use of OWTS, when no connection to a sewer is available, to protect public health and safety. The LAMP was created to meet the minimum standards, and requirements for OWTS. Click here to view the San Bernardino County Draft LAMP that was submitted to the Lahontan Regional Water Quality Control Board on October 30, 2015.

Helpful Links

CA Onsite Wastewater Treatment Systems Overview

Designated Maintenance Areas (DMA) Facts

FAQs for Single Family Residence Septic Systems

FAQs for Multi-Family Residential and Commercial Septic Systems

Liquid Waste Pumper Requirements for the Disposal of Sanitary Waste

Septic Systems Focus of Proposed New Statewide Policy Fact Sheet

Special Event Portable Toilet Recommendations
Chart to calculate the number of portable toilets necessary for an event

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