Why household size changes the year
The estimate adds about 50 gallons of solids per person per year. A new baby moves the date.
Two people in a 1,000-gallon tank are closer to seven years on the planning math. Five people are closer to three. The tool is a division, not a soil test.
A garbage disposal, a home business, or a long guest stay adds solids the formula does not see. Wes asks if anything like that is true and writes it on the ticket.
The company can shorten the interval when they call back. The tool gives them a starting year, not a permit.