If your animal develops diarrhea you can initially treat it by withholding food. At this stage it would be wise to consult with your veterinarian about what to do next. Be aware that if your animal is quite young or old, it could be at higher risk. If the animal seems unusually ill, call your vet immediately. If a person incidentally or accidentally swallows contaminated water, your risk of becoming sick would probably increase slightly over swallowing water outside the area of contamination.
Gastrointestinal distress is a common symptom.
Your risk of becoming ill or getting infection from skin contact is likely very low. The skin provides a very good barrier against most common bacteria and viruses. Any infections resulting from this type of exposure would likely be treatable. Swimmer's Itch is a common symptom. The parks department staff is responsible for cleaning the walkways, piers and floats.