Swimmer's Itch
Swimmer’s itch is a skin rash caused by an allergic reaction to a microscopic parasite released in the water by snails. The Minnesota Department of Natural Resources has more information on swimmer's itch.
To reduce the likelihood of developing swimmer’s itch
- Do not swim in areas where swimmer’s itch is a known problem or where signs have been posted warning of unsafe water.
- Do not swim near or wade in marshy areas where snails are commonly found.
- Towel dry or shower immediately after leaving the water.
- Do not attract birds (e.g., by feeding them) to areas where people are swimming.
The Hennepin County website provides a list of all open and closed beaches in the area.
E. Coli
E. Coli (Escherichia coli) is a single-celled bacteria with a variety of strains. While most strains are harmless, some can make us sick. The City of Plymouth contracts with Three Rivers Park District for water testing.
After a large rainfall, bacteria accumulated within the immediate watershed may run-off into the swimming area. In particular, a primary source of bacteria is goose feces that can run-off into the swimming area. This runoff can lead to increased E. Coli levels. Warmer water temperatures mean more bacteria growth and higher levels.
While water sample tests cannot tell the difference between good or bad strains of E. Coli, the higher the reported number, the greater the risk that a harmful strain is present. City of Plymouth will close a beach area if a single sample exceeds 1260 E. Coli colonies per 100 ml sample or if five samples over a 30-day period have a geometric mean over 126 colonies per 100 ml sample.
Beaches will re-open once the water has been sampled and levels are back to within the state guidelines. You can reduce the chances of getting sick from E. Coli while swimming at beaches by:
- Avoiding getting water in your mouth
- Washing hands after swimming and before eating
- Avoiding swimming after significant rainfall
