If there is a break on a lawn, a backup, or an intense odor, call a septic system contractor for an inspection. Many experts recommend having the tank pumped once every two or three years, depending on the size of the tank and amount of use.

All septic system contractors must be licensed by the county health department. A list is available online at westchestergov.com/health. The site also offers a homeowner’s guide to managing a septic system.