Onsite systems — when designed, installed and maintained properly — are fairly robust systems that in most cases rarely freeze. My experience has always shown that if a system freezes, there’s an underlying reason that in most cases can be addressed.
Frozen mound: Years ago I was called because an alarm was going off. The mound was fairly new, so the alarm was perplexing. It was the middle of winter. Upon arriving at the site, it was obvious the snow on the mound was compacted down on the mound. The household occupants were using the mound as a snowmobile jump, compacting the
