The Ohio state Legislature has passed bills to try to cut down on the nutrients flowing into Lake Erie that feed cyanobacteria.
Cyanobacteria looks like algae, and some forms are toxic.
A cyanobacteria bloom shut down Toledo's water supply briefly last summer.
Manure, untreated sewage, sediment, and phosphorus all encourage the growth of cyanobacteria.
The legislation establishes fines against farmers caught applying manure on a frozen field or right before a heavy rain.