Portion of the OSSF Rules
regulating the minimum
distance of OSSF components
from various features
Figure: 30 TAC §285.91(10)
Table X. Minimum Required Separation Distances for On-Site Sewage Facilities.
TO
Tanks
Soil
Absorption
Systems, &
Unlined ET
Beds
Public Water
Wells2
50
150
150
50
150
150
Public Water
Supply Lines2
10
10
10
10
10
10
Wells and
Underground
Cisterns
50
100
50
20
100
100
Private Water
Line
10
10
5
105
except at
connection to
structure
No
separation
distances
10
Wells
Completed in
accordance
with 16 TAC
§76.1000(a)(1)
50
50
50
20
50
50
FROM
Lined
Sewer Pipe With
Surface
Evapotranspiration Watertight Joints Application
Beds
(Edge of
Spray
Area)
Drip
Irrigation
Distance To:
 Tanks, 50 ft
 Sewer Pipe with
Watertight Joints, 50 ft
 Edge of effluent spray
area or effluent
disposal area, 150 ft
Distance to any OSSF component, 10 ft
Distance to an effluent disposal
area is 100 ft
If a well is completed in
accordance to 16 TAC chapter
76.1000(a)(1) it may be 50 ft
from a disposal area
This chapter addresses
grouting of a well
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Integration & Dissemination
System (WIID)
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2.
3.
4.
5.
6.
Groundwater Database
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Surface Water Data and Mapping Tool
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The TCEQ Water Well Report
Viewer
http://gis3.tceq.state.tx.us/waterwell
public/index.jsp
Older reports
25 ft in a clay soil, i.e. soil absorption
rate (Ra) < 0.1 gal/sf/day,
 75 ft in a soil predominantly sand, i.e.
Ra > 0.1; Or may be 50 ft with
secondary (aerobic) treatment and
disinfection

In the latter case, to place a drip
disposal area 50 ft from a body of
water in a predominantly sandy
soil , aerobic treatment and
disinfection is required
Continuous chlorination is not
recommended by some manufacturers
 UV disinfection is an alternative



All components of an OSSF must be 1
ft from the easement, unless
permission is granted by the easement
holder
Easements are recorded
with the County Clerk’s
office. Other sources are
recorded plats & some
surveys
 Distance
to tanks, drip system
disposal area, soil absorption
systems is 1 ft
 A surface application
spray area may
spray to the edge
of the easement
Is there an underground
easement on this site?
County clerk’s office has recorded
easement or easement abandonment
documents
 “Call before you dig” & other utility
location services
 Fence line markers
 Survey
 Subdivision plat
 Title Search

Distance to tanks is 5 ft
 Distance to sewer pipe is 10 ft
 Distance to surface application area,10 ft
 Distance to drip disposal area is 10 ft
when Ra<0.1, 25 ft when Ra> 0.1

 No
minimum distance to the edge of
a surface application (spray) area
 No minimum distance to a drip
irrigation disposal area
 Tanks and sewer pipes with
untreated sewage must be 5 ft away
THE END