Annex 2

The table shows the water quality guidelines used in calculating freshwater quality scores for monitoring stations in the province of Manitoba listed by parameter, the form of the parameter (for example total or dissolved), the associated guideline value and the source of the guideline.

Water quality guidelines used by Manitoba
ParameterFormGuidelineSource
1 Applies to stations monitored under provincial monitoring programs.
2 Applies to stations monitored under federal monitoring programs (Prairie Provinces Water Board).
2,4-D 4 µg/La
Ammonia1total as NCalculation based on pH and temperatureb, c
Ammonia2un-ionized19 µg/Ld
Arsenic1extractable, total150 µg/Le
Arsenic2total5 µg/La
Cadmium1extractable, total[e0.7409ln[hardness]−4.719] x [1.101672 – {In(hardness)(0.041838)}] µg/L
where hardness as mg [CaCO3]/L]
f
Chloride2dissolved120 mg/La
Copper1extractable, total[e0.8545ln[hardness]-1.702] x (0.96) µg/L
where hardness as mg [CaCO3]/L
b
Copper2total2 µg/L for hardness < 90 mg [CaCO3]/L
[e0.8545ln[hardness]-1.465] x (0.2) µg/L for hardness > 90 mg [CaCO3]/L
where hardness as mg [CaCO3]/L]
d
Iron1total0.3 mg/Ld
Leadextractable, total[e1.273ln[hardness]-4.705] x [1.46203 – {ln(hardness)(0.145712}] µg/L
where hardness as mg [CaCO3]/L
d
MCPA 2.6 µg/La
Nickel1extractable, total[e0.8460ln[hardness]+0.0584] x [0.997]µg/L
where hardness as mg [CaCO3]/L
e
Nitrate1total dissolved2.9 mg N/Ld
Nickel2total< e0.76[ln(hardness)]+1.06 µg/L
where hardness as mg [CaCO3]/L
d
Nitrogen2total1 mg N/Lh
Oxygen1dissolved5 mg/Le
Oxygen2dissolved6.5 mg/La
pH between 6.5 and 9a
Phosphorustotal0.05 mg/Lb, g
Suspended sediments1totalMaximum increase of 25 mg/L for high flow and turbid waters above background levelsd
Zinc1total[e{0.8473ln[hardness]+0.884}] x [0.986] µg/L
where hardness as mg [CaCO3]/L
b, f
Zinc2total7.5 µg/L for hardness ≤ 90 mg [CaCO3]/L
7.5 + 0.75*(hardness-90) for hardness > 90 mg [CaCO3]/L
where hardness as mg [CaCO3]/L
d

Manitoba Water Quality Guideline Sources:

a
[CCME] Canadian Council of Ministers of the Environment (2007) Canadian Water Quality Guidelines for the Protection of Aquatic Life: Summary table, Update 7.1. Retrieved on 21 September 2011.
b
Manitoba Water Stewardship (2011) Manitoba water quality standards, objectives, and guidelines. (PDF; 905.2 KB) Retrieved on 22 September 2011.
c
United States Environmental Protection Agency (1999a) Update of Ambient Water Quality Criteria for Ammonia. Document EPA 822-R-99-014. (PDF; 790.58 KB) Retrieved on 3 August 2011.
d
e
United States Environmental Protection Agency (2009) National Recommended Water Quality Criteria. Retrieved on 2 August 2011.
f
United States Environmental Protection Agency (1999b) National recommended water quality criteria – correction. Document EPA 822-Z-99-001. (PDF; 340.25 KB) Retrieved on 15 November 2011.
g
Prairie Provinces Water Board (1992) Master Agreement on Apportionment. Schedule E: Agreement on Water Quality. Retrieved on 3 August 2011.

Annex 2: Water quality guidelines used by each province and territory