TNRCC On-site Sewerage Table X

TNRCC Instructions Minimum Required Separation Distances for On-Site Sewage Facilities (OSSF)

	Sewage Treatment Tanks or Holding Tanks	Soil Absorption Systems, & Unlined ET Beds	Lined Evapor- transpiration Beds	Sewer Pipe With Watertight Joints	Surface Irrigation (Spray Areas)	Drip Irrigation
Public Water Wells	50	150	150	50	150	150
Public Water Supply Lines	10	10	10	10	10	10
Private Water Well	50	100	50	20	100	100
Private Water Well (Pressure Cemented or Grouted to 100 ft. or Cemented or Grouted to Watertable if watertable is Less Than 100 ft. deep)	50	50	50	20	50	50
Streams, Ponds, Lakes, Rivers (Measured from Normal Pool Elevation and Water Level); Salt Water Bodies (High Tide).	50	75, LPD (Secondary Treatment and Disinfection) 50	50	20	50	25 when R, < 0.1 75 when R, >0.1 50 w/ ST&D
Foundations, Buildings, Surface Improvements, Property Lines, Easements, Swimming Pools, and Other Structures.	5	5	5	5	None, except Prop lines 10 Swim Pool 25	None, except Prop. Lines 5
Sharp slopes, Breaks	0 (special support may be required)	25	5	10	25	10 when R, <0.1 25 when R, > 0.1
Edwards Aquifer Recharge Features See Rules & Regulations Title 313 of the Regulations Relating to the Edwards Aquifer.	50	150	50	50	150	100 when R, < 0.1 150 when R, > 0.1

All distances measured in feet, unless otherwise indicated.
For additional information or revisions to these separation diatances, see Rules & Regulations (Subtitle 290) relating to Water Hygiene.
No OSSF may be installed closer than 75 feet from the banks of the Nuches, Dry Frio, Frio, or Sabinal Rivers downstream from the northern Uvalde County line recharge zone.
Drip irrigation lines may not be placed under foundations.