Also, if you are talking about the community of Mountain House, then there are some "standard' fees.
I can speak from experience of living in Tracy for the pat 14 years, my home is 2400 sq ft, and built in 1994. My PG& E (gas and electric) run anywhere from $90 - $380 -- if it's HOT and my family insists on using the air conditioner. Air is not necessary all summer as we have the Marin influence that brings fog, cooler air, and a breeze in the evenings, so air is rarely needed 24/7. My City of Tracy water bill runs about $120 a month, includes garbage.
As I said - this is for Tracy - not Mountain House.....
Local Tracy/Mountain House Realtor