SEPTIC TANK PUMPING SCHEDULE

A Guide to Septic Cleaning - How Often Do You Pump Out A Septic Tank?

The table below lists the recommended septic tank 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. The removal of septic waste by cleaning the septic tank is a critical step in septic system care as it extends the life of the septic field. Even if you don't care how septic systems work you need to know when to clean the septic tank by pumping out septic waste. Look up your tank size and number of building occupants to see how often the septic tank should be cleaned.                                        

Household size - Number of Occupants
12345678910
Tank
Size
in
Gallons
Septic Tank Pumping Frequency in Years
5005.82.61.51.00.70.40.30.20.1--
7509.14.22.61.81.31.00.70.60.40.3
90011.05.23.32.31.71.31.00.80.70.5
100012.45.93.72.62.01.51.21.00.80.7
125015.67.54.83.42.62.01.71.41.21.0
150018.99.15.94.23.32.62.11.81.51.3
175022.110.76.95.03.93.12.62.21.91.6
200025.412.48.05.94.53.73.12.62.22.0
225028.614.09.16.75.24.23.53.02.62.3
250030.915.610.27.55.94.84.03.53.02.6


NOTES to the Septic Tank Pumping Schedule Table:

Numbers indicate septic treatment tank pump-out in frequency of every nn years for conventional septic tanks, and assuming for year-round occupancy of the residence. (This data does not pertain to simple holding tanks which retain all solid and liquid waste with no treatment no effluent disposal system.)


Garbage disposers will increase the frequency of pumping. For example, if a three bedroom house with six residents had a garbage disposal and was generally producing a higher volume of wastewater, the pumping frequency would be calculated as follows:

1.3 years - [(0.2) x 1.3 years] = 1.0 year

On-site sewage disposal system holding tanks, where there is no septic field, will need to be pumped more frequently based simply on the rate and volume of septic waste inflow.

 
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