Why test your water & water supply? 1 Your water supply is private, ie. comes from a well in your garden, routine tests should be carried out regularly. 2 There are recurring incidents of gastrointestinal illness within your family. 3You are buying a new home or renting a new property. 4 Water stains plumbing fixtures and/or laundry, ie green or reddish stains. 5 Water has an objectionable taste or smell. 6Water appears cloudy, frothy, or coloured. 7Pipes or plumbing show signs of corrosion. 8A water softener or water filter/improvement system has recently been installed. 9 You know or suspect that you may have lead pipes, fittings or solder joints (more information about Testing for Lead and how to reduce lead exposure).