Which of the following desalination plants will always require a sterilizer when providing water to a potable water system?

Correct Answer: Option D — Reverse osmosis type unit

Reverse osmosis (RO) units remove dissolved solids and contaminants but do not inherently guarantee the biological safety of the product water. Per USCG and public health standards, all RO systems providing water for human consumption must include a final sterilization stage, typically UV or chlorination, to ensure potability.