The Government's new freshwater policy unfolds slowly. By 2040 - over 20 years or a generation away - it wants 90 per cent of New Zealand's lakes and rivers to be "swimmable" in the sense that swimmers could dip their head in the water and not get sick.
Not so many years ago it was possible to jump in the car and head to a swimming hole for a summer picnic. The advice now is to go on the regional council website to check the bacteria count. Given the lead time of the new policy, it will remain that way for a few years yet.
In "clean, green New Zealand" just 72 per cent of rivers, streams and lakes are currently considered safe for swimming. Even then, common sense suggests rivers are best avoided after heavy rain. In parts of the country where intensive dairying is practised, rivers and lakes are off-limits.
The release of the freshwater target did not go smoothly for Environment Minister Nick Smith. He resorted to accusing his opponents of using "junk science" to attack the policy. But he made a rod for his back by defining the concept of "swimmable" in a way that hardly conforms with the ordinary meaning of the term and suggesting it would result in waterways being "more swimmable than anywhere in the world".
The Government's new standard is 540 E. coli per 100 millilitres of water. If a river meets that standard 80 per cent of the time, it falls into the swimmable category.