Non-point source pollution is trickier. It is a culmination of pollution from several sources. AFBF says farmers don't have control of the weather so should not be responsible for chemical run-off that is rain induced. I guess rain is a new phenomenon. Maybe it's time to start treating agricultural drains and drainage canals as a point source pollution.
Water quality is important to the whole state.
When we pay our taxes to subsidize ag water we want that water kept as clean as possible, not polluted willfully because good controls are not used. Natural riparian vegetation acts as a filter to ag runoff. And yet few farmers will allow natural vegetation to grow by their waterways. They cannot be good stewards and apply bad chemicals from a helicopter. Environmentalists do not cut down riparian growth.