The Greens policy pointed to the public outrage over issues such as a block of land being sold in Ashburton with rights to bottle and export 40 million litres of pure water while locals using bore waters in the same area had high nitrate levels.
The party also intends to forge ahead with a plan to charge all commercial users of water, such as for irrigation. It said in Government it would develop a fair way of doing that, consulting with interested groups.
Shaw said water bottling and exporting was not the only sector which was profiting from the use of water, and better protection was needed as well as fair charging. In some cases rivers were being sucked dry to provide water for irrigation.
He said thousands of New Zealanders had been impacted by contaminated drinking water scares, such as in Havelock North last year.
"At the same time, water bottling companies are taking the purest, cleanest water out from under our feet."
Shaw said the Greens also wanted better regulations to protect the sources of drinking water and would reinstate funding for small communities and marae to improve their drinking water sources.
The Greens policy to charge for water is similar to that of NZ First which has also proposed charging to take bottled water and returning some of the revenue to the regions. However, NZ First leader Winston Peters has described the Green's policy as separatist because of the Green's assertion Maori have ownership rights over water.
Labour also intends to look at charging commercial users of water, including in the agricultural sector.
The Green Party chose Nelson for its campaign launch because it is aiming for its candidate Matt Lawrey to try to win the electorate from National's Nick Smith. It is only the second time it has targeted an electorate - former co-leader Jeanette Fitzsimons was Coromandel MP in the past.
It will have its party conference next week where further policy will be unveiled.