Can't help much on the well water/bore hole subject. I have rainwater and 'irrigation water', the latter unpotable in its natural state - possibly from a bore hole or reservoir.
There are two main types of septic tanks. The standard one does not need emptying for about 3-4 years. The bio ones have to be installed on properties with small sections or that are on low ground where rainwater could pool. These should be emptied once a year.
Hope that helps a little bit.
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Glenda
In NZ since June 2005
Better to light a candle than to curse the darkness - Chinese proverb
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