Classification of domestic water testing (twelve-month period)

1 - Water tested by a laboratory in the last twelve months

'Water tested by a laboratory in last twelve months' includes dwellings where the household had their water tested by a laboratory within the previous twelve months.

2 - Water not tested by a laboratory in the last twelve months

'Water not tested by a laboratory in last twelve months' includes dwellings where the household had not had their water tested by a laboratory within the previous twelve months.