Auckland Regional Council says dairy farmers in its area are cleaning up their act.

The council's latest figures on compliance show that 94% of dairy farms in the Auckland area met environmental standards in the year to June, up from 77% last season.

ARC Councillor Dianne Glenn, Environmental Management Committee Chair, says that only 6%, or 20 farms, had serious environmental compliance issues with effluent discharge, five fewer farms than in the previous year.