What do federal guidelines in the US mandate that all wastewater treatment plants do to treat their water?
1) Spend >24 hours in the primary stage clarifier
2) The water must remain in the aeration stage of secondary treatment until 5 samples all show no bacteria are present
3) Before being discharged from the facility, water must have chlorine added to disinfect it
4) There is no set standard for the handling of reclaimed water at the federal level in the US