Here's an old post I saved:
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To add a little more confusion to the marine water pollution
arguments, the
journal SCIENCE (29 Mar. 2002) reported on a study which tracked the
biological sources of fecal bacterial in Virginia watersheds. Only 15%
of E.
coli bacteria had a human origin (i.e. septic runoff and boat
discharge). The
remainder came from other animal hosts, the largest contributor being
waterfowl with 32.5% of the total. Similar studies are being carried
out in
California, Washington, and Oregon.

Whats next? Diapers for geese?
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Besides, it's not illegal to pee or crap over the side, it's only
illegal to discharge it after it's been contained. Therefore, get one
of these and be legal:
http://www.bumperdumper.com/bumper2.htm
Just get rid of the plastic bag and let 'er fly!