Well: Chlorinate at least once per year
Septic: I add Rid-X once or twice per year.
On the septic, I'd find the lids for the tank and check flow through the system (water in, water out) just to make sure the outlet from the tank is flowing. With a leach field you can typically see the field when it's dry out (grass over the field will be greener) no advice on sand filter bed, don't have any experience with them.
On the well, it would be nice to know how old the pump and pressure tank are and how deep the well is. Open the toilet tanks and see if there's an orange slime in the tank. If there is you have iron and possibly bacterial iron which isn't a big deal but it costs extra money to filter that out.
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Nick
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