Under what condition may holding tanks be installed?

Holding tanks may be installed primarily when other private sewage disposal systems are unsuitable for a given site. This condition acknowledges that certain locations may have limitations—such as poor soil conditions, high water tables, or proximity to water bodies—that prevent the use of conventional septic systems or other types of sewage disposal methods.

In such instances, holding tanks serve as a temporary solution, collecting and storing sewage until it can be properly transported for treatment and disposal. This allows for the continued use of a property without causing environmental contamination or public health concerns, making it a critical option for areas that cannot accommodate standard sewage systems.

The other options may have some relevance in sewage management but do not correctly reflect the specific regulations surrounding the installation of holding tanks. For example, simply having sufficient space does not justify the installation if environmental or site-specific factors make other systems infeasible.