Educate yourself with some helpful information related to septic system freeze-ups.
General Information on Systems and Preventing Freezing:
Excellent Overview
http://www.cmhc-schl.gc.ca/en/co/maho/gemare/gemare_009.cfm
Septic System Cost of Damage and Replacement
http://www.alsnetbiz.com/homeimprovement/septic.html
Checking Frozen Septic Systems to Prevent Future Problems
http://www.bbe.umn.edu/extens/ennotes/enmay03/checking.html
News and Statistics
Widespread Freezing In Minnesota
http://minnesota.publicradio.org/display/web/2007/02/06/frozenseptic/
