Services We Provide

Beginning October 2, the On-Site Sewage Facility office will be co-located with the Williamson County Engineer/Road and Bridge Division. By combining development services, we hope to be a one-stop for our customers' convenience. Please note the new phone number 512.943.3330, and address at: 3151 S. E. Inner Loop, Suite B, Georgetown, TX 78626. Office hours will remain the same from 8 a.m. – 5 p.m, Monday through Friday.

Williamson County's On-Site Sewage Facilities (OSSF) regulates On-Site Sewage Facilities (a.k.a. septic tanks) located within Williamson County, with the exception of those areas that are located within the City of Austin.

  • Permitting: Process permit applications and related fees for new and/or existing on-site sewage system
  • Inspections: Perform inspections as part of the permitting or complaint investigation processes
  • Complaint Investigation: Investigate exposed sewage and general public complaints related to OSSFs. Inherent to this activity are legal notices of violation and/or potential court action(s)
  • Program Information: Address general customer inquiries, including system records information requests, permitting and fee process inquiries, technical inquiries on types of systems and regulatory compliance questions

Regulatory Authority

Does My Property Require an On-Site Sewage Facility

Visit the County Address Search and enter the property address. If the City listed is "Unincorporated" or an ETJ is listed, it is likely that an OSSF is required. Call 512.943.3330 to verify.

How to Apply for a Permit

An application is required to modify an existing (i.e. repair or enlarge), or to install a new OSSF. Please select from a category below for more information: