The Environment Court has ruled in favour of a plan by Manawatu-Whanganui Regional Council to combat increasing pressure on the area's resources.
The One Plan, proposed in 2007, will provide stricter regulations on water quality, increasing water demands, hill country erosion and declining biodiversity.
Most of the plan has been agreed but appeals to dilute provisions relating to managing nutrient levels and protecting biodiversity have not been upheld by the Environment Court.
Council chairman Bruce Gordon said the ruling means the plan can now proceed.
He said the decision means sheep and beef farms will be required to manage nutrients going on their properties, instead of being excluded, and coastal lakes will have limits set on what goes into them.
Mr Gordon said he is pleased with the overall decision, but 200 pages of details are yet to be released.