Or faucets if you’re in America. Contained in the latest council newsletter:
“We’re responsible for supplying safe drinking water to approximately 20,000 connections for household and commercial use in our district. Our public water is tested and treated with chlorine and high-intensity UV light and pH corrected to make sure it’s safe to drink. However, some plumbing fittings to can allow tiny traces of metals to accumulate in water standing in the fittings for several hours.
“Although the health risk is small, as a precautionary measure the Ministry of Health recommends flushing a mug of water from your tap each morning before use. This will help flush out any water in your pipes that may have dissolved or absorbed small amounts of substances from your plumbing overnight.”