Insight for Sunday 8 March 2009
The Clean Streams Accord aims to get cows - and their excrement - out of streams, rivers and lakes.
Six years after farmers and Fonterra signed up to the agreement with local and central government, the waters remain murky.
Many dairy farms have lodged plans for fencing or planting stream-banks - yet progress on the ground is slow.
In this programme, Craig Ashworth asks how long it will take to make the water clean and, in the meantime, how safe is it to take a dip?