We already knew E. coli was washing into the Withlacoochee (and other) rivers from cattle manure; that is one of the main reasons for our WWALS volunteer water quality testing program.
We also need to worry about estrogens and the PFAS forever chemicals, not only washing off of fields with cow-applied cattle manure, but also off of fields where manure has been applied as fertilizer.
Thanks to WWALS Science Chair Tom Potter for finding these articles.
Shallow Disk Injection and Surface Broadcast from Mina et. al.
Various forms of artificial estrogen are known to damage fish and other wildlife, and can affect humans. Lactating dairy cows produce natural estrogen. I have asked the Florida Department of Environmental Protection (FDEP) to add estrogen tests to its batter of DNA markers and chemical tracers. So far no response.
Odette Mina, Heather E. Gall, Louis S. Saporito, Peter J.A. Kleinman, Journal of Environmental Quality, 1 November 2016, Estrogen Transport in Surface Runoff from Agricultural Fields Treated with Two Application Methods of Dairy Manure,