LONDON — The 18th annual World Water Day (March 22) offers the same old problems and rejects the practical solutions. On Monday, 1 billion people will, as usual, spend the day without clean water and a third of humanity without adequate sanitation. As usual, some 3.5 million men, women and children will die from related diseases this year. Yet many nongovernment organizations and politicians still prefer ideology to ideas, spurning what the private sector delivers to the world's poor.

Activists often claim to be defending the poor from profit-maximizing corporations. But this has more to do with dogma than reality. Given that less than 10 percent of world water management is private, it is hard to see how they can blame corporations for poor supply.

In fact, it is governments that mismanage water and misallocate it to political cronies and powerful lobbies such as farmers. The poor, in rural areas or slums, are left unconnected and unable to do much about it. Anti-privatization groups keep repeating that water should be provided by government but ignore that government has been the worst enemy of the poor.