Average pH All Lakes 1990-2014

A pH of 6.5 to 8.2 is optimal for most organisms.  Rapidly growing algae or submerged aquatic vegetation remove CO2 from the water during photosynthesis, significantly increasing pH levels.           pH levels > 9.0 begin to be harmful to salmonids (trout) and perch.   Rainwater naturally has a pH of 5.5; pH < 5.5 is harmful to freshwater shrimp, snails, and clams; metals normally trapped in sediments may be released into the acidified water.   Acidic <  6.5 pH                      Basic > 7.5 pH