Who designs a septic system in Texas?

It depends on the system type and the local program. The site evaluation must be done by a licensed site evaluator or a professional engineer; site evaluators must also hold another credential, such as an Installer II, professional engineer, professional sanitarian or certified soil scientist license. Tarrant County's application, for example, allows standard systems to be designed by the proposed installer or an unpaid homeowner, while alternative systems such as aerobic units must be designed by a registered professional sanitarian or professional engineer. On the Edwards Aquifer recharge zone, a professional engineer or sanitarian must prepare all planning materials. Check your permitting authority's design rules.

Check your local rule. This varies by state, county or city. Your permitting office has the final word; the official lookup pages below show you who that is.

Sources

• Occupational Licenses: On-Site Sewage Facilities (Septic Systems)Texas Commission on Environmental Quality (TCEQ)
• Residential OSSF Permit ApplicationTarrant County Public Health, Texas
• 30 Tex. Admin. Code §285.40 - OSSFs on the Recharge Zone of the Edwards AquiferCornell Law School Legal Information Institute