More effluent storage ponds are being built on dairy farms across the country, following a crackdown by regional councils.
DairyNZ environmental extension manager Donna Corbin says more than half the 800 dairy farms in Southland will need new or upgraded effluent systems to comply with resource consents by 2015.
She says that's the case across the country, and urges farmers to contact DairyNZ to make sure their effluent ponds meet council regulations.
A consents planning manager for the Canterbury Regional Council, Laura Hull, says the increase has also been driven by a focus on water quality.
There's also been an increase in the number of regional effluent expos as dairy farmers search for the right product for their farms.
The country's biggest dairying region Waikato will hold its second annual expo on Tuesday.
Canterbury held its first expo last week and an event has also been held for the first time in Waimumu in Southland.