What step marks the point at which drinking water is ready to be distributed to consumers?

• A. Potable water enters distribution system
• B. Water is boiled
• C. Water is stored at the treatment plant
• D. Water is tested for taste

Answer: (A)

Potable water entering the distribution system marks the point at which it is ready for distribution because, after treatment, the water must meet safety and quality standards (proper disinfection, acceptable contaminant levels, and regulatory criteria) before it is moved into the network that delivers water to customers. Once water is placed in the distribution system, it is being conveyed through pipes to homes and businesses under ongoing monitoring. Boiling is not a treatment step for a municipal system and is typically a consumer action in emergencies. Storing water at the treatment plant can occur, but it does not by itself signify readiness for distribution. Testing for taste isn’t a reliable indicator of safety, since taste can be affected by many non-hazardous factors and may mask contamination.