What is the full step-by-step process to install a new septic system in Texas?

First, a TCEQ-licensed site evaluator or professional engineer performs a preconstruction site evaluation — a survey of the lot plus soil analysis in the proposed disposal area — and the results determine the type and size of system (TCEQ, Getting a Permit for an OSSF). The owner or the owner's agent then submits an application on the permitting authority's form, all planning materials under §285.5, the site evaluation results, and the fee; only after the permitting authority issues an Authorization to Construct may work begin (30 TAC Chapter 285, §285.3(b)). The licensed installer notifies the authority of the construction start date, requests the initial, final, and any other required inspections at least five working days ahead, builds the system as designed, and after it passes the construction inspection the permitting authority issues a written notice of approval (license to operate) within seven calendar days (30 TAC Chapter 285, §§285.3(d) and 285.61); some counties issue the "Permit and License to Operate" only after that passing final inspection (Ector County Health Dept. septic FAQs.pdf)).

Reviewed August 2026. Links go to the sources this answer was checked against.