Before building, altering, extending or operating an on-site sewage facility in unincorporated Comal County, get a permit and approved plans from Comal County Environmental Health.
An on-site sewage facility, or OSSF, is the county’s term for a system that treats wastewater on the property. The county’s Environmental Health Department reviews designs and issues OSSF permits; its published permit guide lays out nine steps from the first site evaluation to permission to use the finished system.
Residents in unincorporated Comal County must obtain authorization before construction, arrange three inspections during installation and receive a license to operate before using the system. That sequence matters if you are planning a new system or changes to one you already have: submitting an application does not itself authorize construction, and finishing construction does not itself authorize use.
Start with the site, then apply
The first step is an evaluation by a qualified site evaluator. That person reports on soil conditions, surveys the site and identifies structures that must be separated from an on-site system. The site and soil findings guide the choice of treatment and land application components. Planning materials must then be prepared by someone authorized under the applicable rules; the county guide describes circumstances in which a registered professional engineer or registered sanitarian is required. Ask the permitting office which planning requirements apply to your lot and proposed system before paying for a design.
