Prairie Provinces Water Board

The MAA provides for an equitable sharing of available waters for all eastward flowing streams that cross interprovincial boundaries, including lakes and serves to protect transboundary aquifers and surface water quality.

Contact Us

Prairie Provinces Water Board
2365 Albert Street, Room 300
Regina, Saskatchewan S4P 4K1

Telephone: (306) 780-6042
Fax: (306) 780-6810
Email: Lynne.Quinnett-Abbott@ec.gc.ca

www.ppwb.ca

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)

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: 05 August 2010

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