What is the design flow criteria at the state level for residential systems per bedroom, per day?

The design flow criteria for residential septic systems typically establishes a measurement of daily wastewater generation per bedroom in a residential setting. A common guideline used by many state and local jurisdictions is to allocate a design flow of 120 gallons per day for each bedroom in a home. This figure takes into account average water usage patterns and helps ensure that the septic system can effectively handle the waste generated by the household while promoting proper treatment and prevention of system overload.

Choosing 120 gallons reflects an understanding of standard residential design practices aimed at effective wastewater management, ensuring that systems are adequately sized to prevent problems such as flooding or treatment failure. The other options reflect higher daily volumes that might be seen in different contexts or specific types of installations but do not align with the commonly accepted design flow standard for residential systems per bedroom.