What do the California Reuse Regulations specify for virus log removal?

The California Reuse Regulations specify a virus log removal of 12-10-10. This requirement is in place to ensure that reclaimed water undergoes sufficient treatment to effectively reduce the risk of viral pathogens. The "12" represents the total log reduction that must be achieved for viruses, indicating that the treatment must remove at least 99.999999999% of viruses from the water. The "10-10" part signifies that the water treatment process must also achieve at least 10 log removal for both fecal coliform and enterococci, which are indicators of microbial contamination. This high standard is intended to protect public health and ensure that reclaimed water is safe for its intended uses, particularly in irrigation and potentially for potable reuse.