if the garage will be doing servicing, better to have sewer. chemicals discharged to septics have been a source of groundwater contamination resulting in cleanups.

So, yes liability is a concern.Your municiplaities concern is going to be ground water contamination.

Each has their difficulties and differences, but generally the easiest area to grow is the High Plains (deep sandy loam soil with calcareous base, hot days/cool nights, flat topography, low humidity, good groundwater and rainfall).

A $10 check valve got stuck and the pump couldn’t pump the groundwater out so we got completely flooded.

You need to find the source of the mold: leaking water pipe/roof, ground water penetration, drain pipe leak, windows/siding aren't weather tight or flashed correctly and they let rain in, gutters and downspouts aren't working correctly, or tenants are screwing with you intentionally.

If they leak into the soil and groundwater the insurance will not cover the expensive cost to clean it up. surprisingly it's a fairly common issue with the number of aging tanks out there. 

Condensation isn't the issue, humidity is.Something is adding moisture- is it the foundation allowing in ground water?

Nine out of ten sump liners I've opened up were heavily "stained" in both Florida and Georgia from only "ground water". 

Hi,This is a more technical question, I have a house with brand new septic system installed, absolutely new drain field and we realised it already saturated in 3 months!! was expected to take around 15-20 years! I che...

You may actually have a ground water problem or water leakage issue (besides the refrig line).