Design

There are many septic system types often referred to by generic names such as conventional, gravel-less, low pressure dosing or LPD, and aerobic. All of these types of septic systems share the same basic functions but accomplish them in different ways. They all share the first piece or step in which is the pre-treatment or separation of solids. This first step takes place in the first tank or the first section of a multiple section tank. The purpose is to separate the solids that won’t degrade biologically in a time efficient manner. The way this is accomplished is by slowing down the wastewater flow through the first compartment enough that the heavy solids will settle to the bottom and the lighter material such as fats will float but remain in the first tank or compartment. There can be other tanks and functions included in the system such as an aerobic treatment unit (ATU) but at some point the remaining water also known as the effluent needs to be disposed of which brings us to the drain field or the spray field depending on the processing steps that are used in the treatment steps. Above ground disposal requires that the system provide secondary treatment and disinfection. Subsurface disposal may or may not require disinfection but in most typical systems subsurface does not require disinfection. Septic systems can vary a great deal and really each one needs to be treated as a unique system based on the lot and the facility that it supports.

The Texas Commission on Environmental Quality (TCEQ) is the governing body for the State of Texas for on-site sewage facilities (OSSF’s). The TCEQ published the latest version of Title 30, chapter 285 effective December 29th, 2016 in document RG-472 dated May of 2017. Title 30, chapter 285 defines the minimum requirements that are required for an OSSF based on the site evaluation and the facility that it will service. Some authorized agents have orders in place that further restrict the design and permitting of OSSF’s which also must be adhered to.  The list below is just a portion of the authorized agents that we work with.