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Water quality indicators

E. coli results 2016

E. coli is a widespread bacteria present in intestines and excrements of animals and humans. The presence of E. coli can indicate the presence of other germs and pathogens (bacteria, virus). For fresh recreational waters used for primary contact activities, the guideline value is ≤ 400 E. coli/100 mL (Geometric mean concentration (minimum of five samples) = 200 E.coli/100 ml). (1)

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Results of dissolved oxygen concentrations 2016

In aquatic environments, dissolved oxygen (DO) is a relative measure of the amount of oxygen (O2) dissolved in the water. 

Lowest acceptable dissolved oxygen concentration for cold water biota in early life stages is 9,5 mg/L and 6,5 mg/L for other life stages (1).


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Results of nitrate levels 2016

Nitrates are a form of nitrogen found in water and are associated with nutrients. Nitrates generally come from excess fertilizer. In high concentrations nitrates can provoke an excessive growth of algae.

The long term concentration to assure the protection of the aquatic life in freshwater is 13 mg/L or 13 ppm. (3)

To convert NO3-N to NO3 in parts per million (ppm, or mg/L), multiply NO3-N by 4.42

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Results for phosphorous levels 2016

Phosphorous comes from the erosion of farm fields enriched with phosphorous, from purification discharge and factory discharge. Phosphorous combined with nitrogen can cause an excessive growth of algae. The maximal recommended value  for the protection of the aquatic life is 0,03mg/L (Reference).

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Results for pH 2016

pH is the measure of the acidity or alkalinity of a solution. The pH of water varies from 0 to 14, 0 being the most acidic and 14 being the most basic. 

The recommended pH of freshwater for the protection of aquatic life is between 6,5 and 9 (CCME).

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Results for water temperature 2016

The maximal recommended water temperature for the protection of the aquatic life is 20°C. (3)


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