Tuesday, February 9, 2016
Frequently Asked Questions Septic Design Septic Types Inspector Locations Contact Us Affordable Septic Home


What is an OSSF (On-Site Sewage Facility)?

This is the term used when referring to "septic systems".

What is a Registered Professional Sanitarian?

A Registered Sanitarian is qualified to design all "Non-Conventional /
Professionally Designed" septic systems such as a “Low Pressure Dose” or an “Aerobic Treatment Unit” as well as “Conventional” septic systems. Non-Conventional or professionally designed systems are required when a conventional septic system will not be allowed.

What is a State Licensed Site Evaluator?

A site evaluation must be performed on every tract of land where a septic system will be installed. Only a state licensed "Site Evaluator" can submit a site evaluation to the local regulating authority. Site evaluation criteria includes the following:

  • Soil texture analysis
  • Gravel analysis
  • Restrictive horizon analysis
  • Groundwater evaluation
  • Topography
  • Floodplain determination

A septic design cannot be approved without a complete site evaluation.

What is a State Licensed Septic Installer?

Any individual who constructs any part of a septic system shall hold a current "Installer" license issued by the state. Single family residence homeowners may install or repair their own systems without being a registered installer. However, they may not compensate anyone for doing any part of the job (such as digging trenches) unless that individual is a licensed installer (only a licensed electrician may be employed). This exception to being a registered installer does not apply to owners developing the property for sale or lease.

When does a septic system have to be designed by a Registered Sanitarian or Professional Engineer?

  • Small lots - lots smaller than one acre when served by an individual water system (well).
  • Small lots - lots smaller 1/2 acre when served by a public water supply (no individual well).
  • All septic systems in the Edward's Aquifer Recharge Zone.
  • Any septic system proposed to serve manufactured housing communities, recreational vehicle parks, and multi-unit residential developments, which are owned or controlled by a person who rents or leases such space.
  • System(s) needing a variance from the rules.
  • Where local rules require it.

Why would a non-standard septic system be required?

  • When unsuitable soil is encountered such as greater than 30% gravel or fractured rock.
  • When shallow groundwater is encountered.
  • When a restrictive horizon is encountered (solid rock layer).

What do I need to do to get started?

In order to purchase your septic permit, you must first have a survey or plat of the property and a deed or tax record showing whom the landowner is. · In order to design a septic system for your property, the designer will need a copy of the survey or plat of the property. · In addition to the survey or plat of the property, 2 backhoe pits must be excavated at opposite ends of the proposed disposal area (drainfield / leach field) to determine the characteristics of the soil.


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