What is an onsite sewage system or onsite wastewater treatment system (OWTS)?

Onsite systems are sometimes referred to as "septic systems." Onsite sewage systems treat and dispose of domestic sewage on the property where it is generated. One example is a septic tank and soil absorption system. Another example is a lagoon serving a single-family residence. Missouri's onsite sewage law covers systems with a daily flow of 3,000 gallons or less.

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