ANSWERS: 2
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They both do the same job but with a septic system you don't have to pay an extra utility bill as you do with public sewer. You do have to have your septic tank pumped from time to time to avoid backups and other problems but that is inexpensive. Also, if it fails you are responsible for repairs or replacement whereas the township handles public sewer issues. Does that help ?
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It depends on the soil characteristics of the leaching field for the septic system. If the porsity of the soils is poor, you'll have to pay to have the leach line trenches enlarged and the fill dirt amended to hold more effluent than the natural soils. That is expensive and greatly limits the amount of greywater (dish washer, clothes washer, shower, sinks) you can put in the septic to dilute the blackwater (toilets) going in. A well-designed septic is as efficent as a centralized sewer treatment system but is very limited in the number of households it can support. If you're servicing a lot of homes, you'd be better off with a central sewer system.
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