The broad range of activities it covers include coastal works, earthworks, water use and discharges to air, land and water.
"I've said before that it's not an understatement to label this proposed plan one of - if not the - most important documents council has consulted on for many years,"
Mr Shepherd said.
"It will impact, both directly and indirectly, on most Northlanders in some way."
Among key changes are new limits taking water from rivers, lakes and aquifers, making it easier to get permission for mangrove removal and new stock exclusion rules for rivers, drains, wetlands and lakes.
In a new approach to fresh water management, the Proposed Regional Plan also has tailor-made rules for five priority water catchments; Doubtless Bay, Pouto, Waitangi, Whangarei and Mangere.
The Proposed Regional plan is available online: www.nrc.govt.nz/newregionalplan.