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On-Site Sewage Facility (OSSF) Regulation & Inspection
OSSF Stakeholder Input Needed
The current on-site sewage facility (OSSF) rules were adopted in 2008. The Williamson County and Cities Health District (WCCHD) believes the regulations regarding aerobic treatment systems are specific and written to protect the water supply, environment, and community. All regulations should be reviewed periodically to keep up with best management practices, current technology, and emergent scientific principles. We would like your input on the following issues regarding aerobic treatment systems. Please indicate your preference on the following questions.
------- Please take a short online survey --------
A working group to analyze the results of the survey and discuss possible updates will be created. Please contact Deborah Marlow or Steve Gilmer if you are interested in participating in this group. Also contact us if you have questions about the survey.
Williamson County and Cities Health District is striving to provide better services through increased quality and efficiency for our OSSF stakeholders. We greatly appreciate your comments, suggestions, and questions and sincerely hope you complete this survey.
WCCHD Environmental Health Services is the authorized agent of the Texas Commission on Environmental Quality (TCEQ) for Williamson County.
The following property types must be connected to an approved On-Site Sewage Facility (OSSF), or be connected to an authorized wastewater disposal system:
- New or altered single family dwelling
- Multi-family dwelling
- Business, commercial, or industrial structure
Review the OSSF Guide for Williamson County for complete regulations and application process.
How to Apply for a Permit
If you are installing a new OSSF, or modifying (i.e. repair or enlargement) an existing OSSF on your property, an application is required. In addition to the application, please complete and submit the permitting requirements checklist. A complete submittal of Part I of the checklist is required before WCCHD can begin the application process. Please review the Instructions/FAQs document before completing the forms.
- Instructions/FAQs for Submitting an OSSF Application
- OSSF Permitting Requirements Checklist
- Application for Williamson County OSSF [ .pdf ] [ .doc ]
- Flood Plain Management
- Proposed Subdivision Regulation
In addition to the above residential requirements, a completed Commercial Use Questionnaire must be submitted with the design packet for a commercial building. [ .pdf ] [ .doc ]
Re-Inspection of an Existing Residential OSSF:
Most mortgage lenders require a re-inspection of an OSSF whenever a property is sold. Environmental Health Services staff perform a surface inspection for this purpose. The Application for Evaluation of an Existing On-Site Sewage Facility form describes the scope and limitations of this inspection.
More information: For more about the Residential OSSF permit process, contact Paul Walter at 512-943-3620, for Commercial OSSF information, contact Steve Gilmer at 512-943-3620.