What is the maximum aggregate capacity of oil storage tanks to be permitted for a cross-connection?

The maximum aggregate capacity of oil storage tanks permitted for a cross-connection is 660 gallons. This limit is established to mitigate risks associated with cross-connections, which can lead to contamination of potable water supplies. When oil storage tanks exceed this capacity, the risk of a cross-connection increases, as larger volumes of oil can create more significant hazards if a leak or improper connection occurs. This regulation is important for maintaining safe drinking water and ensures that any potential contaminants are managed within acceptable limits to protect public health. Understanding these limits is crucial for compliance with plumbing codes and regulations, which aim to prevent backflow and ensure safe water systems.