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The two Maintenance Charts below will give you a general idea of how often septic tanks need to be cleaned based on the size of tank and number of people in the household. The number of years or months between cleaning provided in these charts do not take into account other important criteria such as the condition of the system, daily water usage patterns and field size/condition. For this reason, the interval for cleaning your septic tank may vary considerably from the interval provided by the charts below.

To obtain the correct cleaning interval you should contact a qualified septic cleaning company in your area. After inspecting your system and obtaining additional information from you, the company can provide you with the optimal cleaning interval that will properly maintain your system through the years.

If you do not have a garbage disposal, use Chart One otherwise refer to Chart Two to identify the maximum cleaning interval for your system.

Septic Maintenance Chart One
Estimated Septic Cleaning Intervals for Home without a Garbage Disposal
Tank Size
In Gallons
----------------------- Number of People in Household -----------------------
01 02 03 04 05 06 07 08 09 10+
------------------------------------- Cleaning Intervals ---------------------------------------
500 5.8 yr 2.6 yr 1.5 yr 1 yr 8 mo 5 mo 3 mo 2 mo 1 mo .5 mo
750 9.1 yr 4.2 yr 2.6 yr 1.8 yr 1.3 yr 1 yr 8 mo 7 mo 5 mo 3 mo
900 11 yr 5.2 yr 3.3 yr 2.3 yr 1.7 yr 1.3 yr 1 yr 9 mo 8 mo 6 mo
1000 12.4 yr 5.9 yr 3.7 yr 2.6 yr 2 yr 1.5 yr 1.2 yr 1 yr 9 mo 8 mo
1250 15.6 yr 7.5 yr 4.8 yr 3.4 yr 2.6 yr 2 yr 1.7 yr 1.4 yr 1.2 yr 1 yr
1500 18.9 yr 9.1 yr 5.9 yr 4.2 yr 3.3 yr 2.6 yr 2.1 yr 1.8 yr 1.5 yr 1.3 yr
1750 22.1 yr 10.7 yr 6.9 yr 5.0 yr 3.9 yr 3.1 yr 2.6 yr 2.2 yr 1.9 yr 1.6 yr
yr = Years
mo = Months

Septic Maintenance Chart Two
Estimated Septic Cleaning Intervals for Home With a Garbage Disposal
Tank Size
In Gallons
----------------------- Number of People in Household -----------------------
01 02 03 04 05 06 07 08 09 10+
------------------------------------- Cleaning Intervals ---------------------------------------
500 4.6 yr 2.1 yr 1.2 yr 9.5 mo 6.7 mo 3.8 mo 2 mo 1 mo .5 mo -- mo
750 7.3 yr 3.4 yr 2.1 yr 1.4 yr 1 yr 9.5 mo 6.7 mo 5.8 mo 3.8 mo 2.8 mo
900 8.8 yr 4.2 yr 2.6 yr 1.8 yr 1.4 yr 1 yr 9.5 mo 7.7 mo 6.7 mo 4.8 mo
1000 9.9 yr 4.7 yr 3 yr 2 yr 1.6 yr 1.2 yr 1 yr 9.5 mo 7.6 mo 6.7 mo
1250 12.5 yr 6 yr 3.8 yr 2.7 yr 2 yr 1.6 yr 1.4 yr 1.1 yr 1 yr 9.5 mo
1500 15.1 yr 7.3 yr 4.7 yr 3.4 yr 2.6 yr 2 yr 1.7 yr 1.4 yr 1.2 yr 1 yr
1750 17.7 yr 8.6 yr 5.5 yr 4.0 yr 3.1 yr 2.5 yr 2 yr 1.8 yr 1.5 yr 1.3 yr
yr = Years
mo = Months


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