In an onsite wastewater system, which of the following is true about capacity?

The correct choice highlights an important regulation regarding the size of grease traps in onsite wastewater systems. A grease trap is an essential component designed to intercept and retain fats, oils, and grease from wastewater before it enters the septic system. The specific requirement that the grease trap must not be less than one thousand gallons ensures that it can adequately manage the volume of waste produced, particularly in commercial applications such as restaurants or food processing facilities where grease production can be significant. Having a grease trap of this minimum capacity helps in preventing clogs and maintaining the health of the entire wastewater system.

In contrast, the other information regarding greater capacity being universally better for all components can be misleading because having oversized components can lead to operational issues. Not all traps needing similar capacities varies as the design and function differ across components, such as septic tanks versus grease traps. Additionally, capacity requirements may also apply to other components of the system beyond just septic tanks, making the statement regarding only septic tanks having capacity requirements incomplete.