$600 to $800 in Ore and Wash...but $100 to $300 is average. Costs vary on
local labor rates and what the contractor has to do with the load...in
some cases they can disinfect it and spray it on a field. In others they
have to dump at a treatment plant and they pay per gallon so it adds to
the cost.

I tell people to ask the contractor to do an annual inspection (for less)
and only pump as necessary. Price comparison: the city will charge you
$500 to $1,500 per year for treatment and these plants do a lousy job (lot
of breakdowns and resulting pollution) but a proper septic system will
treat wastewater better at a fraction of the cost...but you need to make
sure it is a proper system to start with then you need to use it right.

However building these treatment facilities is a multibillion dollar a year
business for the engineering firms and cities generate tremendous revenues
from the fees so you seldom hear about the advantages of on-site systems.


Jim V