Yes, I would add to that. There are better farming practices that need to be encouraged by working with the farming community. I was at a binational meeting where the operator of a very large farm on the south side of Lake Erie described how he was leaving what was left of his crop after he took the corn off the field. He then mulched all that material and left it on the field, and over a period of years developed a mulch that retained water and the nutrients in the soil, and prevented runoff.
The other thing that's happening is rules to prevent discharge of manure or raw sewage onto farmlands during the winter when the ground is frozen, because that simply allows those nutrients to run right off into adjacent waterways. Regulation and preventing that from being allowed is absolutely necessary.