Which statement best describes the backflow protection measures chosen after a risk assessment?

• A. Replacing copper with PVC.
• B. Installing a simple mechanical filter.
• C. Installing backflow protection devices appropriate to risk (e.g., RPZ or DCV).
• D. Increasing pipe diameter globally.

Answer: (C)

Backflow protection is about stopping contaminated water from flowing back into the clean supply when pressure changes. After assessing the specific hazards, you choose devices that actually prevent reverse flow based on that risk. That’s why installing backflow protection devices appropriate to risk, such as RPZ or DCV, is the best approach. RPZs and DCVs are designed to block backflow under different hazard levels, providing reliable protection where it’s needed. Replacing copper with PVC, increasing pipe diameter globally, or simply adding a mechanical filter doesn’t address the backflow risk in the same way and won’t reliably prevent contamination.