There's been quite a reaction online to the switch to water campaign.
No doubt the discussion on websites has been duplicated in kitchens and living rooms round the country. Drink Wanganui water? You're joking.
The Whanganui District Health Board is joining a campaign led by the New Zealand Dental Association to get people to drink water - and water only - for a month.
It's a good idea to try and reduce the number of sugary drinks drunk and reduce tooth decay.
But the problem is, as people have vociferously pointed out, Wanganui water is terrible to drink from the tap. And that's a health issue right there.