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2020 Shoal Lake water quality test results

Image of Shoal Lake inletOur staff test Shoal Lake and the intake at the west end of Indian Bay (where the water enters the aqueduct) as part of our routine water quality testing program.

For more information on Winnipeg's drinking water and our impact on Shoal Lake, visit the web page on Shoal Lake - Our Water Source.

Testing

We take samples at the intake every week during the open water season and every two weeks during the rest of the year. We also take samples from the Shoal Lake watershed from May to October. We test the intake samples for:

  • routine water chemistry
  • metals
  • disinfection by-products
  • bacteria and protozoa
  • pesticides, herbicides and PCBs

By taking these samples, we track seasonal changes in water quality and determine the effects (if any) of human activity within the Shoal Lake watershed.

Water entering the aqueduct intake passes through screens before being treated by chlorine on a periodic basis for slime and Zebra mussel control. The aqueduct brings water to Deacon Reservoir before entering the Water Treatment Plant. There, we test both the raw and treated water before the water is distributed to Winnipeg homes and businesses.

Test results are from January 1 to December 31, 2020

What is being measured How it's measured Shoal Lake average Shoal Lake range
Miscellaneous
Carbon, Dissolved Organic parts per million 8.7 6.8 to 11
Carbon, Total Organic parts per million 8.7 6.6 to 12.7
Chlorophyll-a parts per billion 4.6 <1.0 to 12.3
Colour, Apparent TCU 14.3 10 to 23
Colour, True TCU 8.9 7.5 to 12.5
Conductivity microsiemens per centimetre 153 144 to 167
Odour units 92 75 to 150
pH units 7.88 7.29 to 8.53
Plankton (algae) count cells/mL 6,668 859 to 17,790
Solids, Total parts per million 96 71 to 117
Solids, Total Dissolved parts per million 80 50 to 121
Temperature degrees Celcius 10.4 1 to 23.9
Turbidity (clearness) NTU 0.9 0.23 to 5.03
Anions and Nutrients
Alkalinity, Total parts per million as calcium carbonate 73.7 68.5 to 89.3
Hardness, Total parts per million as calcium carbonate 76.1 69.8 to 82.2
Chloride parts per million 1.8 1.3 to 2.1
Fluoride parts per million 0.08 0.07 to 0.09
Nitrate Nitrogen parts per million 0.055 0.005 to 0.285
Perchlorate parts per billion <0.20 <0.20 to <0.20
Phosphorus, Total Reactive parts per million 0.0038 <0.0010 to 0.0201
Phosphorus, Total parts per million 0.0183 0.0092 to 0.034
Sulphate parts per million <0.4 <0.4 to 0.4
Total Kjeldahl Nitrogen (TKN) parts per million 0.52 0.38 to 0.77
Bacteria
Escherichia Coli MPN per 100 mL 0 0 to 4
Total Coliforms MPN per 100 mL 88 1 to >200
Disinfection By-Products
Aldehydes parts per billion 6.7 3.5 to 10.4
Haloacetic acids parts per billion <1.2 <1.2 to <1.2
Trihalomethanes parts per billion <2.7 <2.7 to <2.7
Enteric Protozoa
Cryptosporidium oocysts per 100 L 0 0 to 0
Giardia cysts per 100 L 0 0 to 0
Pesticides
Alachlor parts per billion <0.1000 <0.1000 to <0.2000
Aldrin parts per billion <0.0100 <0.0100 to <0.0500
alpha-BHC parts per billion <0.0100 <0.0100 to <0.0500
alpha-Chlordane parts per billion <0.0100 <0.0100 to <0.0500
alpha-Endosulfan parts per billion <0.0100 <0.0100 to <0.0500
Atrazine parts per billion <0.1000 <0.1000 to <0.2000
Azinphos-methyl parts per billion <0.0100 <0.0100 to <0.0200
beta-BHC parts per billion <0.0100 <0.0100 to <0.0500
beta-Endosulfan parts per billion <0.0100 <0.0100 to <0.0500
Carbaryl parts per billion <0.2000 <0.2000 to <0.4000
Carbofuran parts per billion <0.2000 <0.2000 to <0.4000
Chlorothalonil parts per billion <0.050 <0.050 to <0.050
Chlorpyrifos parts per billion <0.0050 <0.0050 to <0.0100
delta-BHC parts per billion <0.0100 <0.0100 to <0.0500
Diazinon parts per billion <0.0050 <0.0050 to <0.0100
Diclofop-methyl parts per billion <0.1000 <0.1000 to <0.2000
Dieldrin parts per billion <0.0100 <0.0100 to <0.0500
Dimethoate parts per billion <0.1000 <0.1000 to <0.2000
Endrin parts per billion <0.0100 <0.0100 to <0.0500
Eptam parts per billion <0.200 <0.200 to <0.200
gamma-Chlordane parts per billion <0.0100 <0.0100 to <0.0500
Heptachlor parts per billion <0.0100 <0.0100 to <0.0500
Heptachlor Epoxide parts per billion <0.0100 <0.0100 to <0.0500
Lindane (gamma-BHC) parts per billion <0.0100 <0.0100 to <0.0500
Malathion parts per billion <0.1000 <0.1000 to <0.2000
Methoxychlor parts per billion <0.0100 <0.0100 to <0.0500
Methyl Parathion parts per billion <0.1000 <0.1000 to <0.2000
Metribuzin parts per billion <0.2000 <0.2000 to <0.4000
Mirex parts per billion <0.1500 <0.0100 to <0.1500
o,p-DDD parts per billion <0.0100 <0.0100 to <0.0500
o,p-DDE parts per billion <0.0100 <0.0100 to <0.0500
o,p-DDT parts per billion <0.0100 <0.0100 to <0.0500
p,p-DDD parts per billion <0.0100 <0.0100 to <0.0500
p,p-DDE parts per billion <0.0100 <0.0100 to <0.0500
p,p-DDT parts per billion <0.0100 <0.0100 to <0.0500
Parathion parts per billion <0.0130 <0.0130 to <0.0260
Propaclor parts per billion <0.200 <0.200 to <0.200
Propanil parts per billion <0.200 <0.200 to <0.200
Propoxur parts per billion <0.200 <0.200 to <0.200
Simazine parts per billion <0.1000 <0.1000 to <0.2000
Terbufos parts per billion <0.1000 <0.1000 to <0.2000
Triallate parts per billion <0.1000 <0.1000 to <0.2000
Trichlopyr parts per billion <0.0500 <0.0500 to <0.0500
Trifluralin parts per billion <0.0300 <0.0300 to <0.0600
Polychlorinated Biphenyls
Arochlor 1016 parts per billion <0.0200 <0.0200 to <0.0200
Arochlor 1221 parts per billion <0.0200 <0.0200 to <0.0200
Arochlor 1232 parts per billion <0.0200 <0.0200 to <0.0200
Arochlor 1242 parts per billion <0.0200 <0.0200 to <0.0200
Arochlor 1248 parts per billion <0.0200 <0.0200 to <0.0200
Arochlor 1254 parts per billion <0.0200 <0.0200 to <0.0200
Arochlor 1260 parts per billion <0.0200 <0.0200 to <0.0200
Phenoxy Acid Herbicides
2,4,5-T parts per billion <0.5000 <0.5000 to <0.5000
2,4,5-TP parts per billion <0.5000 <0.5000 to <0.5000
2,4-D parts per billion <0.5000 <0.5000 to <0.5000
2,4-DB parts per billion <0.0500 <0.0500 to <0.0500
2,4-DP parts per billion <0.5000 <0.5000 to <0.5000
Bromoxynil parts per billion <0.5000 <0.5000 to <0.5000
Dicamba parts per billion 0.0073 <0.0060 to 0.0105
Dinoseb parts per billion <0.5000 <0.5000 to <0.5000
MCPA parts per billion <0.5000 <0.5000 to <0.5000
MCPB parts per billion <0.0500 <0.0500 to <0.0500
Mecoprop parts per billion <0.5000 <0.5000 to <0.5000
Picloram parts per billion <0.5000 <0.5000 to <0.5000
Total Metals
Aluminum parts per million 0.00269 0.00127 to 0.0051
Antimony parts per million 0.000385 <0.000025 to 0.00018
Arsenic parts per million 0.000751 0.00064 to 0.000891
Boron parts per million 0.00368 <0.00208 to 0.00652
Cadmium parts per million <0.000007 <0.000007 to <0.000007
Calcium parts per million 19.6 17.529 to 23.74
Chromium parts per million <0.00004 <0.00004 to 0.00007
Chromium VI parts per million <0.00050 <0.00050 to <0.00050
Copper parts per million 0.001455 0.000638 to 0.00337
Iron parts per million 0.04409 0.01288 to 0.17963
Lead parts per million <0.000065 <0.000065 to 0.000085
Magnesium parts per million 6.015 5.329 to 7.163
Manganese parts per million 0.01 0.00285 to 0.03359
Mercury parts per billion <0.0050 <0.0005 to <0.0050
Nickel parts per million 0.000098 <0.000021 to 0.000191
Potassium parts per million 1.232 1.064 to 1.521
Sodium parts per million 2.228 2 to 2.669
Uranium parts per million <0.000032 <0.000032 to 0.000036
Zinc parts per million 0.0011 0.00035 to 0.00236

Note: Where value is expressed as less than (<), the value is halved and used in the calculations, where value is expressed as (>), the value is used in the calculations.

Guidelines for Canadian Drinking Water Quality do not apply to Shoal Lake

Last updated: April 15, 2021

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