Missouri Septic Systems: Pumps, Dosing and Alarms per MU Extension

MU Extension fact sheet EQM104f (Home-A-Syst series; author and date not stated). Only stated points are included; cost figures on the page are left out.

Where pumps appear

Dosing or enhanced-flow systems use a pump or siphon to improve the distribution of effluent (Not verified: "set volume" and "aeration between doses" wording).
Pressure distribution systems pump effluent through small-diameter pipes directly into the drainfield, (Not verified: the "without a distribution box" detail).
Effluent may reach the distribution pipes by gravity or by pump; (Not verified: "pump uphill" wording).
If a system depends on a pump, a backup power supply may be needed in addition to adequate tank storage.
Alarms should be installed on holding tanks or pumping chambers to warn when nearly full.
The pump should be checked along with the float switch, alarm and air vents to the dosing tank.
Backflow valves should be installed on the main distribution line in flood hazard areas.

Other stated points

Missouri sets 120 gallons per day per bedroom for sizing; the page lists minimum new tank sizes of 1,000 gallons (three bedrooms), 1,250 (four) and 1,500 (five).
A general rule of thumb given is to have the tank pumped by a licensed pumper every three to five years (Not verified: that it is called the most important maintenance step).
Divert sump pump discharge, roof runoff and footing drains away from the drainfield.
Never enter a septic tank without proper ventilation and safety procedures.

Not verified: current Missouri rules and setback tables (the page's table is partly garbled); lift stations are not mentioned on the page.

General information only. Not health, plumbing, legal or code advice. Confirm with your county health department and a licensed professional.