Where a person (other than a water undertaker) constructs a water main or service pipe which is to be used, in whole or in part, for supplying water for domestic or food production purposes, no water undertaker may permit that water main or service pipe to become connected with its supply system unless it vests (to the relevant extent) in a water undertaker.
In subsection (1) above, "the relevant extent" means the extent specified in the agreement for the vesting in the undertaker of the water main or service pipe in question.
The prohibition imposed on a water undertaker by subsection (1) above shall be enforceable under section 18 above by the Authority.