TNRCC Instructions
On-Site Sewerage Facilities (OSSF)
Criteria for Standard Subsurface Disposal Methods

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Factors Suitable (S) Unsuitable (U)
Topography Slopes 0-30% Slopes greater than 30%  
Complex slopes.
Subsoil Texture Soil Class Ib, II, or III Sandy Soils. Loamy Soils. Soils Class Ia & IV Clayey soils (Except for pumped effluent systems in Class IV soils). 
Subsoil Structure Class Ib & II Structure not significant. Platy structure. Fractured rock. Massive clayey soils. 
Soil Depth Suitable soils greater than 24 inches below bottom of excavation. Suitable or provisionally suitable soil less than 24 inches below excavation bottom. 
Restrictive Horizon  No restrictive horizon within 24 inches of the bottom of the proposed excavation.  Restrictive horizon within 24 inches of the bottom of the proposed excavation.
Groundwater No indication of  roundwater within 24 inches of the bottom of the proposed excavation. Drainage mottles within 24 inches of the bottom of the proposed excavation.
Flood Hazard No flooding potential. Areas located in the regulatory floodway. Depressional areas without adequite drainage.
Other n/a Fill material. Potential health hazards or groundwater contamination.
TNRCC Permit Instructions  


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