Over 50,000 on-site sewage systems are permitted every year in Texas. Improperly installed or maintained systems are a major cause of runoff pollution in this state. The first step to a functioning on-site sewage system is a soil and site evaluation. When the site is properly evaluated, a system adequate to the limitations of the site can be engineered
Web-based Soil and Site Evaluation Course
This course provides 8 hours continuing education for the OSSF program. Register online and take the course online!
Water Table Map of Galveston County (PDF File – 724 K) *
This map shows the minimum soil water table depths for Galveston County. This is the default level for designing an on-site system. Only examination by a professional soil scientist can over-ride this value.
The following two documents deal with an on-going project with the Texas On-Site Wastewater Treatement Research Council to deal with the issues of shallow groundwater and on-site septic systems.
Synoptic Literature Review of Shallow Groundwater (short version) (PDF File – 145 K) *
Synoptic Literature Review of Shallow Groundwater (full version) (PDF file – 441 K)*
(fully annotated bibliography and review of pathogen survival in soils)
Pilot Study for Shallow Groundwater Maps for On-Site Evaluation (PDF File – 1.45 MB) *
* (PDF files require Adobe Acrobat reader)