There's calls for more transparency from Otago Regional Council about the impacts and costs of new freshwater rules.

Federated Farmers Otago has written to councillors, district Mayors, and ministers demanding the latest draft of the council's Land and Water Plan be made public.

President Luke Kane says a secretive consultation process has left the community in the dark.

"We understand that some of the district councils are really concerned with these rules - obviously, everybody is in a financial pinch at the moment, especially councils deciding how and where to spend their money."

Otago regional council says it believes it's had an open process, with meetings across Otago.

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