With the water bill going up, I found this out.
Majority of the bill is a sewer fee.

In fact almost the whole bill is sewer fee.
Friend's house has a septic tank.
No sewer fees.

Cost him $200 a year to suck the tank out.

Don't know if it's feasible to have a septic tank installed, but if building a new house, and your looking for as little monthly out cost as possible, a septic tank might be a good idea.
With that and photovoltaic, monthly utility bill would be very low.