In drinking water there are 3 different type of contaminants which are group as:
Physical contaminants are big chunks of waste that can be clean out water at the first few stages in the water treatment. Examples of physical contaminants are sand, twigs, leaves, soil e.c.t.
Chemical contaminants are harder to treat than physical contaminants and they are more dangerous too. These contaminants are mostly liquids that dissolve in water but there are some that don’t mix but still contaminate water such as oil. Few examples of chemical contaminants are pesticide, toxins, metals
Biological contaminants as the name states are living organism that contaminates water and are one of the most harmful contaminants and hardest to remove from water. Examples of biological contaminants are viruses, bacteria, parasites e.c.t
Turbidity is the clearness/cloudiness of a fluid caused by large number of small particles are invisible to the naked eye. 3 sources of turbidity in drinking water are phytoplankton, human activity that disturb land(mining, agriculture) and storm water runs o
Staff, F. (2010, August 11). Turbidity Measurement. Retrieved January 19, 2016, from https://www.fondriest.com/news/turbiditymeasurement.htm
The turbidity limitation in Toronto/North York is 0.1 NTU. High turbidity in water is not a good thing because there would be less oxygen in the water an many other contaminants.
Coliforms such as E.Coli are bacteria from human/animal waste that are found soil from runoff water they a type of biological contaminant.
They enter drinking into our drinking water from animal waste from farms that travels down in runoff water and then seeps into the soil and enters our water system. Drinking water contaminated with coliforms is bad for human consumption and can lead to water borne diseases which may also lead to death. The MAC(go to part3 for more details) for coliforms is 0mg per 100 ml of water.