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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?

10 minutes/inch
30 minutes/inch
60 minutes/inch
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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