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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.


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 September 30, 2020

What is being measured How it's measured Shoal Lake average Shoal Lake range
Carbon, Dissolved Organicparts per million8.76.8 to 11.0
Carbon, Total Organicparts per million8.66.6 to 12.7
Chlorophyll-aparts per billion4.5<1.0 to 12.3
Colour, TrueTCU9.37.5 to 12.5
Conductivitymicrosiemens per centimetre154144 to 167
Odourunits9275 to 150
pHunits7.877.29 to 8.53
Plankton (algae) countcells/mL5,930859 to 15,640
Solids, Totalparts per million9871 to 117
Solids, Total Dissolvedparts per million8655 to 121
Solids, Total Suspendedparts per million<3<3 to 6
Temperaturedegrees Celcius12.01.0 to 23.9
Turbidity (clearness)NTU0.960.23 to 5.03
Anions and Nutrients
Alkalinity, Totalparts per million as calcium carbonate73.768.5 to 89.3
Hardness, Totalparts per million as calcium carbonate76.869.8 to 82.2
Chlorideparts per million1.81.3 to 2.1
Fluorideparts per million0.090.08 to 0.09
Nitrate Nitrogenparts per million0.0660.005 to 0.285
Perchlorateparts per billion<0.20<0.20 to <0.20
Phosphorus, Total Reactiveparts per million0.0047<0.0010 to 0.0201
Phosphorus, Totalparts per million0.02070.0128 to 0.0340
Sulphateparts per million<0.4<0.4 to <0.4
Total Kjeldahl Nitrogen (TKN)parts per million0.530.43 to 0.77
Escherichia ColiMPN per 100 mL10 to 4
Total ColiformsMPN per 100 mL931 to >200
Disinfection By-Products
Aldehydesparts per billion6.03.5 to 8.5
Bromodichloromethaneparts per billion<0.4<0.4 to <0.4
Haloacetic acidsparts per billion1.3<1.2 to 3.2
Trihalomethanesparts per billion<2.7<2.7 to <2.7
Enteric Protozoa
Cryptosporidiumoocysts per 100 L00 to 0
Giardiacysts per 100 L00 to 0
Total Metals
Aluminumparts per million0.002790.00127 to 0.00510
Antimonyparts per million<0.000025<0.000025 to <0.000025
Arsenicparts per million0.0007620.000640 to 0.000891
Boronparts per million0.00318<0.00208 to 0.00646
Cadmiumparts per million<0.000007<0.000007 to <0.000007
Calciumparts per million19.93317.529 to 23.740
Chromiumparts per million<0.00004<0.00004 to 0.00005
Chromium VIparts per million<0.00050<0.00050 to <0.00050
Copperparts per million0.0016080.001008 to 0.003370
Ironparts per million0.050790.01288 to 0.17963
Leadparts per million<0.000065<0.000065 to 0.000085
Magnesiumparts per million6.0655.329 to 7.163
Manganeseparts per million0.011100.00285 to 0.03359
Mercuryparts per billion<0.0050<0.0005 to <0.0050
Nickelparts per million0.000095<0.000021 to 0.000191
Potassiumparts per million1.2661.064 to 1.521
Sodiumparts per million2.2402.000 to 2.669
Uraniumparts per million<0.000032<0.000032 to <0.000032
Zincparts per million0.001280.00086 to 0.00236
Alachlorparts per billion<0.1000<0.1000 to <0.2000
Aldrinparts per billion<0.0100<0.0100 to <0.0100
alpha-BHCparts per billion<0.0100<0.0100 to <0.0100
alpha-Chlordaneparts per billion<0.0100<0.0100 to <0.0100
alpha-Endosulfanparts per billion<0.0100<0.0100 to <0.0100
Atrazineparts per billion<0.1000<0.1000 to <0.2000
Azinphos-methylparts per billion<0.0100<0.0100 to <0.0200
beta-BHCparts per billion<0.0100<0.0100 to <0.0100
beta-Endosulfanparts per billion<0.0100<0.0100 to <0.0100
Carbarylparts per billion<0.2000<0.2000 to <0.4000
Carbofuranparts per billion<0.2000<0.2000 to <0.4000
Chlorothalonilparts per billion<0.050<0.050 to <0.050
Chlorpyrifosparts per billion<0.0050<0.0050 to <0.0100
delta-BHCparts per billion<0.0100<0.0100 to <0.0100
Diazinonparts per billion<0.0050<0.0050 to <0.0100
Diclofop-methylparts per billion<0.1000<0.1000 to <0.2000
Dieldrinparts per billion<0.0100<0.0100 to <0.0100
Dimethoateparts per billion<0.1000<0.1000 to <0.2000
Endrinparts per billion<0.0100<0.0100 to <0.0100
Eptamparts per billion<0.200<0.200 to <0.200
gamma-Chlordaneparts per billion<0.0100<0.0100 to <0.0100
Heptachlorparts per billion<0.0100<0.0100 to <0.0100
Heptachlor Epoxideparts per billion<0.0100<0.0100 to <0.0100
Lindane (gamma-BHC)parts per billion<0.0100<0.0100 to <0.0100
Malathionparts per billion<0.1000<0.1000 to <0.2000
Methoxychlorparts per billion<0.0100<0.0100 to <0.0100
Methyl Parathionparts per billion<0.1000<0.1000 to <0.2000
Metribuzinparts per billion<0.2000<0.2000 to <0.4000
Mirexparts per billion<0.0100<0.0100 to <0.0200
o,p-DDDparts per billion<0.0100<0.0100 to <0.0100
o,p-DDEparts per billion<0.0100<0.0100 to <0.0100
o,p-DDTparts per billion<0.0100<0.0100 to <0.0100
p,p-DDDparts per billion<0.0100<0.0100 to <0.0100
p,p-DDEparts per billion<0.0100<0.0100 to <0.0100
p,p-DDTparts per billion<0.0100<0.0100 to <0.0100
Parathionparts per billion<0.0130<0.0130 to <0.0260
Propaclorparts per billion<0.200<0.200 to <0.200
Propanilparts per billion<0.200<0.200 to <0.200
Propoxurparts per billion<0.200<0.200 to <0.200
Simazineparts per billion<0.1000<0.1000 to <0.2000
Terbufosparts per billion<0.1000<0.1000 to <0.2000
Triallateparts per billion<0.1000<0.1000 to <0.2000
Trichlopyrparts per billion<0.0500<0.0500 to <0.0500
Trifluralinparts per billion<0.0300<0.0300 to <0.0600
Polychlorinated Biphenyls
Arochlor 1016parts per billion<0.0200<0.0200 to <0.0200
Arochlor 1221parts per billion<0.0200<0.0200 to <0.0200
Arochlor 1232parts per billion<0.0200<0.0200 to <0.0200
Arochlor 1242parts per billion<0.0200<0.0200 to <0.0200
Arochlor 1248parts per billion<0.0200<0.0200 to <0.0200
Arochlor 1254parts per billion<0.0200<0.0200 to <0.0200
Arochlor 1260parts per billion<0.0200<0.0200 to <0.0200
Phenoxy Acid Herbicides
2,4,5-Tparts per billion<0.5000<0.5000 to <0.5000
2,4,5-TPparts per billion<0.5000<0.5000 to <0.5000
2,4-Dparts per billion<0.5000<0.5000 to <0.5000
2,4-DBparts per billion<0.0500<0.0500 to <0.0500
2,4-DPparts per billion<0.5000<0.5000 to <0.5000
Bromoxynilparts per billion<0.5000<0.5000 to <0.5000
Dicambaparts per billion<0.0100<0.0060 to <0.0100
Dinosebparts per billion<0.5000<0.5000 to <0.5000
MCPAparts per billion<0.5000<0.5000 to <0.5000
MCPBparts per billion<0.0500<0.0500 to <0.0500
Mecopropparts per billion<0.5000<0.5000 to <0.5000
Picloramparts per billion<0.5000<0.5000 to <0.5000

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: Dec 22, 2020

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