Scottish Water have issued a warning on social media to remind people of the 'three C's'.
Taking to Instagram, the corporation told locals - including those in Glasgow - that every day water samples need to be randomly checked in Scotland. This is to ensure that the drinking water we all consume is at its highest quality.
But to make sure households only allow official Scottish Water works to carry out checks, they are urging people to remember three words to avoid being scammed. In order to protect yourself and avoid bogus calls, they have said before they agree to anything, always think 'Card, Check, Call'.