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  2. A septic tank is a buried, watertight tank designated and constructed to receive and partially treat raw domestic sanitary wastewater. Heavy solids settle to the bottom of the tank while greases and lighter solids float to the top.
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  3. Types of Septic Systems | US EPA - U.S. Environmental …

    Jul 16, 2024 · Learn about the different types of septic systems used in the US, from conventional to alternative, with illustrations and descriptions. Find out how each system works, what factors affect its design and size, and what are the …

     
  4. Septic tank - Wikipedia