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2020 Water Treatment Plant raw water quality test results

Image of Deacon ReservoirThe aqueduct carries raw water from Shoal Lake to Deacon Reservoir. Deacon Reservoir is a storage reservoir located just east of Winnipeg. There are four open cells at Deacon, which together hold 8.8 billion litres, enough water to supply Winnipeg for about 20 days. Before the Water Treatment Plant was built, raw water sampling was done at Deacon Reservoir. The water now leaves Deacon Reservoir and enters the Water Treatment Plant where we do our raw water testing.


We test the raw water at the Water Treatment Plant on a continual basis. We also test water from Shoal Lake, the Water Treatment Plant treated water outlet and the Winnipeg distribution system. We track seasonal variations in water quality as the water passes through the aqueduct, the Deacon Reservoirs and enters the Water Treatment Plant.

At the Water Treatment Plant raw water inlet sampling point we test for:

  • routine water chemistry
  • taste and odour compounds
  • metals
  • disinfection by-products
  • bacteria and protozoa
  • toxins produced by algae
  • pesticides, herbicides and PCBs

Test results are from January 1 to September 30, 2020

What is being measured How it's measured Water Treatment Plant raw average Water Treatment Plant raw range
Carbon, Dissolved Organicparts per million8.23.2 to 11.1
Carbon, Total Organicparts per million8.27.0 to 10.6
Chlorine, Freeparts per million0.03<0.02 to 0.13
Chlorine, Totalparts per million0.04<0.02 to 0.15
Chlorophyll-aparts per billion6.51.1 to 14.7
Colour, TrueTCU8.92.5 to 17.0
Conductivitymicrosiemens per centimetre163152 to 176
Langelier Index (4 C)units-0.37-0.42 to -0.31
Langelier Index (60 C)units0.400.36 to 0.46
Microcystinparts per billion<0.20<0.20 to <0.20
Odourunits9275 to 150
ORPmillivolts472.1383.0 to 554.1
Oxygen, Dissolvedparts per million10.86.0 to 14.9
pHunits7.897.32 to 8.55
Plankton (algae) countcells/mL5,3581,117 to 14,530
Solids, Totalparts per million10785 to 131
Solids, Total Dissolvedparts per million8864 to 115
Temperaturedegrees Celcius10.91.6 to 24.2
Turbidity (clearness)NTU0.990.35 to 3.88
UV Transmittance, Filteredpercent transmissivity74.572.1 to 78.4
UV Transmittance, Unfilteredpercent transmissivity72.670.2 to 76.4
Anions and Nutrients
Alkalinity, Totalparts per million as calcium carbonate75.369.2 to 87.0
Alkalinity, Bicarbonateparts per million96.491.5 to 106.0
Alkalinity, Carbonateparts per million<0.60<0.60 to <0.60
Alkalinity, Hydroxideparts per million<0.34<0.34 to <0.34
Hardness, Totalparts per million as calcium carbonate80.572.9 to 91.2
Ammoniaparts per million0.010.01 to 0.02
Bromideparts per million<0.01<0.01 to <0.01
Chlorideparts per million2.01.4 to 2.6
Fluorideparts per million0.0610.059 to 0.065
Nitrate Nitrogenparts per million0.014<0.005 to 0.037
Nitriteparts per million<0.001<0.001 to 0.001
Perchlorateparts per billion<0.20<0.20 to <0.20
Phosphorus,Totalparts per million<0.030<0.030 to <0.050
Sulphateparts per million1.0<0.4 to 5.2
Escherichia ColiMPN per 100 mL260 to >200
Total ColiformsMPN per 100 mL960 to >200
Heterotrophic Plate CountCFU per mL142<1 to >300
Disinfection By-Products
Aldehydesparts per billion6.74.7 to 9.4
Bromodichloromethaneparts per billion<0.4<0.4 to <0.4
Haloacetic acidsparts per billion1.0<1.2 to 3.5
Trihalomethanesparts per billion<2.7<2.7 to <2.7
Enteric Protozoa
Cryptosporidiumoocysts per 100 L00 to 0
Giardiacysts per 100 L00 to 0
Taste and Odours
236 TCA - 2,3,6-trichloroanisoleparts per trillion<0.48<0.48 to <0.51
246 TCA - 2,4,6-trichloroanisoleparts per trillion<0.48<0.48 to <0.51
345 TCV - 3,4,5-trichloroveratroleparts per trillion<0.19<0.19 to <0.20
Geosminparts per trillion8.361.70 to 34.7
IBMP - 2-isobutyl-3-methoxypyrazineparts per trillion<0.19<0.19 to <0.20
IPMP - 2-isopropyl-3-methoxypyrazineparts per trillion<0.19<0.19 to <0.20
Dichloromethaneparts per million<0.0050<0.0050 to <0.0050
MIB - 2-methylisoborneolparts per trillion<9.60<9.60 to <10.0
MTBE - methyl tertiary-butyl etherparts per million<0.00050<0.00050 to <0.00050
NDMA - N-nitrosodimethylamineparts per trillion2.501.65 to 4.10
Total Metals
Aluminumparts per million0.002850.00109 to 0.01350
Antimonyparts per million0.000024<0.000025 to 0.000095
Arsenicparts per million0.0008230.000588 to 0.001376
Bariumparts per million0.01510.0140 to 0.0168
Berylliumparts per million<0.00010<0.00010 to <0.00010
Bismuthparts per million<0.000050<0.000050 to <0.000050
Boronparts per million0.00497<0.00208 to 0.01600
Cadmiumparts per million<0.000007<0.000007 to <0.000007
Calciumparts per million20.79717.260 to 26.080
Cesiumparts per million<0.000010<0.000010 to <0.000010
Chromiumparts per million0.00005<0.00004 to 0.00041
Chromium VIparts per million<0.00050<0.00050 to <0.00050
Cobaltparts per million<0.00010<0.00010 to <0.00010
Copperparts per million0.0005240.000043 to 0.002413
Ironparts per million0.069260.03619 to 0.13196
Leadparts per million<0.000065<0.000065 to 0.000175
Lithiumparts per million0.00260.0025 to 0.0028
Magnesiumparts per million6.3904.919 to 7.942
Manganeseparts per million0.013890.00364 to 0.04925
Mercuryparts per billion<0.00050<0.00050 to <0.0050
Molybdenumparts per million0.0001580.000150 to 0.000171
Nickelparts per million0.000205<0.000021 to 0.001146
Potassiumparts per million1.2810.965 to 1.731
Rubidiumparts per million0.00170.0016 to 0.0018
Seleniumparts per million0.0000630.000057 to 0.000073
Siliconparts per million2.892.12 to 3.49
Silverparts per million<0.000010<0.000010 to <0.000010
Sodiumparts per million2.3632.023 to 2.891
Strontiumparts per million0.04030.0372 to 0.0456
Telluriumparts per million<0.00020<0.00020 to <0.00020
Thalliumparts per million<0.000010<0.000010 to <0.000010
Thoriumparts per million<0.00010<0.00010 to <0.00010
Tinparts per million<0.00010<0.00010 to <0.00010
Titaniumparts per million<0.00030<0.00030 to <0.00030
Tungstenparts per million<0.00010<0.00010 to <0.00010
Uraniumparts per million<0.000032<0.000032 to 0.000051
Vanadiumparts per million<0.00050<0.00050 to <0.00050
Zincparts per million0.00096<0.00011 to 0.00675
Zirconiumparts per million<0.00020<0.00020 to <0.00020
Alachlorparts per billion<0.1000<0.1000 to <0.2000
Aldrinparts per billion<0.0080<0.0080 to <0.0100
alpha-BHCparts per billion<0.0080<0.0080 to <0.0100
alpha-Chlordaneparts per billion<0.0080<0.0080 to <0.0100
alpha-Endosulfanparts per billion<0.0100<0.0100 to <0.0500
Atrazineparts per billion<0.1000<0.1000 to <0.2000
Azinphos-methylparts per billion<0.0100<0.0100 to <0.0300
beta-BHCparts per billion<0.0080<0.0080 to <0.0100
beta-Endosulfanparts per billion<0.0100<0.0100 to <0.0500
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<0.0250<0.005 to <0.0250
delta-BHCparts per billion<0.0080<0.0080 to <0.0100
Diazinonparts per billion<0.0250<0.0050 to <0.0250
Diclofop-methylparts per billion<0.1000<0.1000 to <0.2000
Dieldrinparts per billion<0.0080<0.0080 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<0.0080<0.0080 to <0.0100
Heptachlorparts per billion<0.0080<0.0080 to <0.0100
Heptachlor Epoxideparts per billion<0.0080<0.0080 to <0.0100
Lindane (gamma-BHC)parts per billion<0.0080<0.0080 to <0.0100
Malathionparts per billion<0.1000<0.1000 to <0.2000
Methoxychlorparts per billion<0.0080<0.0080 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<0.0080<0.0080 to <0.0100
o,p-DDDparts per billion<0.0100<0.0040 to <0.0100
o,p-DDEparts per billion<0.0100<0.0040 to <0.0100
o,p-DDTparts per billion<0.0100<0.0040 to <0.0100
p,p-DDDparts per billion<0.0100<0.0040 to <0.0100
p,p-DDEparts per billion<0.0100<0.0040 to <0.0100
p,p-DDTparts per billion<0.0100<0.0040 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 billion0.0083<0.0060 to 0.0167
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 greater than (>), the value is used in the calculations

Guidelines for Canadian Drinking Water Quality do not appply to raw water.

Last updated: Nov 17, 2020

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