which is a way that untreated sewage can enter the water?\nfaulty residential, municipal, or marina septic…

which is a way that untreated sewage can enter the water?\nfaulty residential, municipal, or marina septic treatment systems\nmsds with closed (in - board position) y - valves\nproperly constructed municipal spray irrigation systems in approved soils\ndirect discharges from drinking water treatment plants
Answer
Brief Explanations:
Faulty septic treatment systems can leak untreated sewage into water. Closed Y - valves in MSDs prevent discharge, properly - constructed municipal spray irrigation in approved soils is a controlled process and drinking water treatment plants do not discharge untreated sewage.
Answer:
Faulty residential, municipal, or marina septic treatment systems