If you have an LPP system, ask the contractor and Health Department to provide details concerning the initial pump delivery rate and pressure head they set up when the pressure distribution network was approved for use. The drainfield does not have unlimited capacity. The typical daily water use is 50 gallons per person. The soil drainfield has a maximum design capacity of 120 gallons per bedroom. When near capacity, systems may not work.
Overloads can occur seasonally or daily.
Water conservation will extend the life of your system. Limit disposal to sewage. Don't use your septic tank as a trash can for cigarette butts, tissues, sanitary napkins, cotton swabs, cat box litter, coffee grinds, or disposable diapers. Restrict the use of your garbage disposal. Don't put grease or cooking oil into the system.