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Septic Tanks
What is a Septic Tank?

      Your septic tank is your very own self-contained underground wastewater treatment system. All of your household wastewater is treated and disposed of using this system. Poorly maintained or designed septic systems can pollute both the surface and the ground water.

 

       Traditional systems usually consist of a large tank that is created to hold the wastewater from households while any soils from the water settle and decompose. The wastewater then follows into a second part of the system called the drainfield.

                                                         A- wastewater in

                                                         B-scum layer     

                                                         C-water            

                                                         D-sludge layer  

                                                         E-To drain field

 

Important Practices in Maintaining a Septic System
  • Having it properly installed
  • New homeowners should have the septic system inspected
  • Continually pump out the system at a rate parallel to the number of occupants living in the house and the size of the septic tank. Contacting an inspector would be the easiest way to find out how often a septic tank should be inspected and pumped. The following chart demonstrates the ideal frequency a septic tank should be pumped:

Table I. Septic Tank Pumping Frequency in Years

Household size - Number of Occupants

1

2

3

4

5

6

7

8

9

10

Tank-Gallons

Septic Tank Pumping Frequency in Years

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

0.3

900

11.0

5.2

3.3

2.3

1.7

1.3

1.0

0.8

0.7

0.5

1000

12.4

5.9

3.7

2.6

2.0

1.5

1.2

1.0

0.8

0.7

1250

15.6

7.5

4.8

3.4

2.6

2.0

1.7

1.4

1.2

1.0

1500

18.9

9.1

5.9

4.2

3.3

2.6

2.1

1.8

1.5

1.3

1750

22.1

10.7

6.9

5.0

3.9

3.1

2.6

2.2

1.9

1.6

2000

25.4

12.4

8.0

5.9

4.5

3.7

3.1

2.6

2.2

2.0

2250

28.6

14.0

9.1

6.7

5.2

4.2

3.5

3.0

2.6

2.3

2500

30.9

15.6

10.2

7.5

5.9

4.8

4.0

3.5

3.0

2.6

 

 

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