The agency said there were 25 incidents of heavy rain washing off farm fields into rivers, roads or homes in January, nearly double the number of incidents reported during the same period in 2024.
It said some previously used methods of preventing erosion no longer work and the window for taking action had become shorter due to climate change.
Farmers are being asked to risk assess their land and install measures to prevent run-off reaching property and watercourses.
The best way to help prevent erosion is to plant trees. But farmers complained about that too when they forced policy u-turns because it would mean actually doing something to access grants.