Practice Quiz

Green Plumbing

Category - Water-Efficient Technology

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Which of the following is a standard cutoff in terms of percolation rate (minutes it takes for the water to fall one inch during a perc test), above which alternative wastewater treatment systems are generally recommended?
  1. 10 minutes/inch
  2. 30 minutes/inch
  3. 60 minutes/inch
  4. 120 minutes/inch
Explanation
Answer: C -A standard cutoff for percolation rate is 60 minutes per inch. Slower rates indicate soil with low permeability, which hinders efficient treatment and may lead to health hazards. Alternative on-site wastewater treatment systems are recommended for sites with very slow (or extremely fast, i.e., less than 0.1) percolation rates - where they are allowed at all. Sometimes a site is deemed entirely unsuitable for on-site wastewater treatment.
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