Septic systems
Sewage systems
Sewage and septic systems
None of the above
Septic systems
Sewage systems
Sewage and septic systems
None of the above
To kill microscopic organisms that could make people sick
To make sure that it tastes good
To make sure that the water is clear
To add microscopic organisms that will make the water safe to drink
CIA
EPA
FDA
FBI
True
False
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