The county health department says every 2 to 4 years, which seems
like an awfully long time to me. I know when I rented a house my
landlord had the tank pumped every year.

I'm one person, and the tank is 500 gallons. Any guidelines?

--
Stan Brown, Oak Road Systems, Tompkins County, New York, USA
http://OakRoadSystems.com/
"If there's one thing I know, it's men. I ought to: it's
been my life work." -- Marie Dressler, in /Dinner at Eight/