Nevada Administrative Code
Chapter 445A - Water Controls
ON-SITE SEWAGE DISPOSAL SYSTEMS
Operation and Monitoring of Systems
Section 445A.9658 - Septic tanks: General requirements

1. A septic tank included as part of an on-site sewage disposal system must:

2. Septic tank inlets and outlets must allow free venting of tank gases back through the drainage system.

3. The top of the tee or baffle for both the vented inlet and vented outlet must extend at least 12 inches below the level of the liquid. The bottom of the tee or baffle for both the inlet and the outlet must extend at least 12 inches below the level of the liquid. The invert of the inlet pipe must be at least 2 inches above the invert of the outlet pipe.

4. Septic tanks may be installed in a series of not more than two. Each tank in the series must be a single compartment tank, and the volume of the first tank must not be less than two-thirds of the total capacity of both tanks.

5. Each compartment of the septic tank must have at least one manhole to provide access into the compartment. Each manhole must have a minimum diameter of 20 inches. If the inlet compartment is longer than 12 feet, an additional manhole must be provided over the baffle or partition wall. If the tank is longer than 30 feet, an additional manhole must be added for each 10 feet of length. Manholes must be designed to minimize odors and to prevent unauthorized entry.

6. The top of the tank must be at least 6 inches below the finished grade. If the top of the tank is more than 18 inches below the finished grade, each manhole required pursuant to subsection 5 must be extended to within 18 inches of the finished grade.