Water samples of one liter should be collected from which source and under what condition?

Water samples of one liter should be collected from which source and under what condition?

• A. Bathroom Sink
• B. Public Drinking Fountain
• C. Residential tap most commonly used for drinking water after the water has remained motionless for 6 hours
• D. Kitchen faucet used during cooking

Answer: (C)

Testing for lead in drinking water focuses on the water people actually drink and cook with. Collect a one-liter sample from the residential tap most commonly used for drinking and cooking after the water has been motionless for about six hours. The stagnation period lets any lead that can leach from pipes or fixtures accumulate in the water, producing a result that reflects what someone could be exposed to in typical use. Bathroom sinks and public drinking fountains aren’t the outlets people rely on for drinking water, and a kitchen faucet used only during cooking isn’t the faucet most people drink from, so they wouldn’t represent the exposure from the home’s drinking water.

Testing for lead in drinking water focuses on the water people actually drink and cook with. Collect a one-liter sample from the residential tap most commonly used for drinking and cooking after the water has been motionless for about six hours. The stagnation period lets any lead that can leach from pipes or fixtures accumulate in the water, producing a result that reflects what someone could be exposed to in typical use. Bathroom sinks and public drinking fountains aren’t the outlets people rely on for drinking water, and a kitchen faucet used only during cooking isn’t the faucet most people drink from, so they wouldn’t represent the exposure from the home’s drinking water.