Environment Canterbury has met with the managers of the station at the centre of a cattle controversy involving Chief Justice Dame Sian Ellis and her husband, Hugh Fletcher.
The meeting follows the publication of photos of the cattle wading and drinking from Lake Taylor, right next to a Department of Conservation campground.
The cattle were owned by Dame Sian and Mr Fletcher.
Environment Canterbury is now investigating, and monitoring and compliance regional manager Marty Mortiaux said there was a lot to look at.
"We need to confirm ... that the stock are out of the water, and then we need to get an explanation from the property owner and/or the farm manager on why they were in there, and then we measure against what the actual adverse effect is."