Samples from private water supplies will normally be taken from your kitchen tap and then sent for analysis at an approved laboratory. The sampling frequency and what we look for will depend on the risk assessment.

Larger supplies (using more than 10m³ water per day or serving 50 or more persons) and those serving commercial or public premises are now required to undergo 'check monitoring'. This will be at least annually, as well as more extensive 'audit monitoring' on a less frequent basis.

Small supplies (using less than 10m³ water per day and serving less than 50 persons) are monitored at least once every five years. This will be more frequent if shown to be necessary by the risk assessment.

Supplies serving only an individual, privately owned domestic dwelling will only be risk assessed and tested at the request of the owner or occupier.