For pesticide tanks, a site gauge is required if the tank is:

A site gauge is required for pesticide tanks that are 50 gallons or larger because these tanks pose a higher risk for spills and leaks due to their capacity. The site gauge allows for more accurate monitoring of the pesticide levels within the tank, ensuring that the contents can be managed safely and responsibly. This is particularly important in the context of environmental protection and compliance with regulations, as larger tanks can lead to more significant environmental impacts if a leak were to occur.

Smaller tanks, such as those less than 50 gallons, may not require a site gauge because they typically present a reduced risk and are easier to manage. Therefore, the guideline focuses on larger tanks where the potential for greater quantities of pesticide to escape into the environment necessitates more stringent monitoring measures.