Why we collect samples IWNL will collect water samples from your kitchen tap to ensure the water quality meets the standards set by the Water Supply (Water Quality) Regulations 2016. These are random samples, so one of our samplers may knock on your door unexpectedly. They will carry ID badges at al times to identify
The hardness of your water depends on how many naturally occurring minerals are present in it. This will be determined by the geographical features of where you live in the UK.