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How
often should
I have my system
pumped?
The
frequency of pumping
depends on several
factors:
- capacity
of the septic
tank
- volume
of wastewater
- amount
of solids in
wastewater
The
following table
lists estimated
pumping frequency
according to septic
tank capacity
and household
size. The frequencies
were calculated
to provide a minimum
of 24 hours of
wastewater retention
assuming 50 percent
digestion of the
retained solids.
These numbers
are for estimation
purposes only -
every system and
situation is different
and pumping may
be required more
or less often
than indicated.
If you are in
doubt, contact
your local septic
system professional.
Estimated
septic tank pumping
frequencies in
years for full-time
residences:
|
|
Household
size (number
of people)
|
|
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9+
|
|
Tank
Size (gals)
|
Duration
(in years)
Between
Pumpings
and/or Inspections
|
|
500
|
5.8
|
2.6
|
1.5
|
1.0
|
0.7
|
0.4
|
0.3
|
0.2
|
0.1
|
|
750
|
9.1
|
4.2
|
2.6
|
1.8
|
1.3
|
1.0
|
0.7
|
0.6
|
0.4
|
|
900
|
11.0
|
5.2
|
3.3
|
2.3
|
1.7
|
1.3
|
1.0
|
0.8
|
0.7
|
|
1000
|
12.4
|
5.9
|
3.7
|
2.6
|
2.0
|
1.5
|
1.2
|
1.0
|
0.8
|
|
1250
|
15.6
|
7.5
|
4.8
|
3.4
|
2.6
|
2.0
|
1.7
|
1.4
|
1.2
|
|
1500
|
18.9
|
9.1
|
5.9
|
4.2
|
3.3
|
2.6
|
2.1
|
1.8
|
1.5
|
|
1750
|
22.1
|
10.7
|
6.9
|
5.0
|
3.9
|
3.1
|
2.6
|
2.2
|
1.9
|
|
2000
|
25.4
|
12.4
|
8.1
|
5.9
|
4.5
|
3.7
|
3.1
|
2.6
|
2.2
|
|
2250
|
28.6
|
14.0
|
9.1
|
6.7
|
5.2
|
4.2
|
3.5
|
3.0
|
2.6
|
|
2500
|
31.9
|
15.6
|
10.2
|
7.5
|
5.9
|
4.8
|
4.0
|
3.5
|
3.0
|
© 2005 COLE
Publishing
Inc.
|
