What is the commonly assumed retention time in a septic tank?

Estimating and Costing MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Estimating and Costingcivil-engineering-mcqs › estimating-and-costing
Published
20 Jan 2019
Last updated
28 May 2026

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Explanation

The standard detention time used for septic tank design is typically 30 minutes, allowing sufficient settling of solids.

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