Prairie Provinces Water Board

The MAA was signed in 1969 by Canada and the governments of Alberta, Saskatchewan, and Manitoba in recognition of the need to cooperatively share and manage interprovincial waters for the benefit of present and future generations.

Contact Us

Prairie Provinces Water Board
Suite 1001 - 10th Floor, Alvin Hamilton Building
1783 Hamilton Street
Regina, SK S4P 2B6

Telephone: (306) 564-4462 or (306) 807-8563
Fax: (306) 780-6810  

Email: ppwb@ec.gc.ca

Ammonia

Ammonia

Total Ammonia Nitrogen (mg/L) **

The toxicity of ammonia relates primarily to the un-ionized form (NH3). The concentration of un-ionized ammonia present in water increases with pH and temperature. The values below represent total ammonia-nitrogen concentrations (at various temperatures and pH levels) above which accompanying NH3 concentrations may be harmful to aquatic life.

Total Ammonia (NH3 + NH4+)

(maximum levels expressed as N at various pH/temperature conditions)

Toxicity of Ammonia under varying Temperature and pH Conditions
Water Temperature (°C) / pH
(pH units)

 

0°

5°

10°

15°

20°

25°

30°

6.50

2.06

1.97

1.81

1.81

1.22

0.85

0.60

6.75

2.06

1.97

1.81

1.81

1.22

0.85

0.61

7.00

2.06

1.97

1.81

1.81

1.22

0.85

0.61

7.25

2.06

1.97

1.81

1.81

1.23

0.86

0.61

7.50

2.06

1.97

1.81

1.81

1.23

0.87

0.62

7.75

1.89

1.81

1.73

1.64

1.15

0.81

0.58

8.00

1.26

1.18

1.13

1.09

0.76

0.54

0.39

8.25

0.72

0.67

0.64

0.62

0.44

0.32

0.23

8.50

0.40

0.39

0.37

0.37

0.26

0.19

0.15

8.75

0.23

0.22

0.21

0.22

0.16

0.12

0.09

9.00

0.13

0.13

0.13

0.13

0.11

0.08

0.06

** excerpt from the "Surface Water Quality Objectives", Water Quality Branch Saskatchewan Environment and Public Safety, November, 1988 (WQ 110)

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Page last modified: 26 November 2019 09:59

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