Septic guide
Septic Tank Size Guide
How tank capacity is matched to bedrooms and household size in Texas.
Sizing by bedrooms
Tank capacity is commonly sized to the number of bedrooms — a proxy for occupancy and daily flow. A 3-bedroom home typically uses a 1,000-gallon tank.
Why size matters
An undersized tank fills and needs pumping more often, and can stress the drain field. Correct sizing protects the whole system.
Local note
In Montgomery County, a licensed site evaluator sizes the system as part of the permit, factoring in soil and daily flow — not just bedroom count.