Effects5

High pH levels in water can effect the habitat in numerous ways. High pH levels in water can cause acidity in the water which can decrease the population of fish in that area.

Different Ranges of pH can effect the way plants produce nutrients and how much nutrients they can produce.

 Humans also affect the pH levels by pollution that can cause acid rain and cause high acidity in the water. (Acid rain is rain containing acids that form in the atmosphere when industrial gas disperses and is combined with water) 

Also, draining mines can cause ores and minerals to go into a stream and cause high levels of pH. People can also cause the average pH level in a stream; which is around 5.5 or 7.5 for fresh water fish but salt water prefers 8.0 or above ; to increase rapidly and kill away fish.