Properties Without City Sewer Need a Permitted Septic System

Outside city limits, Collin County handles septic permits. Inside a city, ask whether the city or county is in charge. Lots divided in 2008 or later generally start at 1 usable acre. Older lots and lots with a private well can have different rules.

A licensed sanitarian or engineer must check the site and design the system. A permit expires after 365 days with no work. Before buying rural land, ask the permit office to confirm the lot date, usable area, sewer access, and acreage rule. A lot can meet the acreage rule and still fail its site review.