A backup is urgent and unpleasant, but almost always traceable to one of a few common causes.
Independent referral service — we connect you with local licensed contractors and don't perform the work ourselves.
Untreated sewage carries bacteria and other pathogens. Avoid direct contact, keep children and pets away from the affected area, and wash thoroughly if contact occurs. Don't attempt to open or work inside the tank yourself.
Every flush, shower, and load of laundry adds more water to a system that's already struggling — pause everything until it's addressed.
Especially if sewage has reached the yard or a drain field — treat it as contaminated ground until cleaned up.
This isn't a DIY repair — a professional can diagnose whether it's a full tank, a blockage, or a drain field failure.
The single most common cause — solids have built up past the point the system can handle.
A clog between the house and tank, sometimes from flushing items that don't break down.
The field can no longer absorb effluent properly, often due to age, saturation, or root damage.
Tree or shrub roots seeking moisture can crack lines or the tank itself.
On aerobic systems, a failed aerator can disrupt the whole treatment process — see our aerator guide.
A system sized for a smaller household can struggle to keep up if water usage has increased.
What a pump-out involves and how often you need one.
If the issue is more than a full tank.
Prevent the next one — what to flush and what to avoid.