Forty per cent of dairy farms required to lodge a resource consent application with Horizons Regional Council have not done so.
A total of 229 dairy operations were required to have lodged an application by January 1 this year under the regional council's One Plan, which aims to limit nitrogen pollution of waterways.
The One Plan - adopted by the council in 2014 - limits nitrogen leaching by intensive farm operations, namely dairy, commercial horticulture, cropping and intensive sheep and beef farming.
Figures released to the Chronicle under the Official Information Act reveal that only 137 of the 229 dairy operations which came under new rules have lodged consent applications. The new rules took effect on July 1 last year, and farms had six months - up until January 1 - to apply.
Of the 137 applications received by Horizons, 94 have been processed and granted. None have been declined.