How much does a new septic system cost in Litchfield County?
Last updated July 18, 2026
Short answer
A new septic system in Litchfield County typically costs $15,000 to $35,000 installed. Simple gravity systems can start near $12,000; engineered systems on poor soil run highest.
The tank itself is a small part of the price. Most of the cost is the drain field, excavation, permits, soil and percolation testing, and the system design. Litchfield County's hilly, ledgy soil often forces an engineered system — a mound, sand filter, or pump system — which costs more than a simple gravity setup. A large estate home needs a bigger system than a small cottage. Getting three bids matters here: on a job this size, installer prices on the same site can vary by thousands.