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2020 Water Treatment Plant treated water quality test results

Image of water treatment plant filter tanksThe new Water Treatment Plant is a state-of-the-art, modern facility designed for performance, safety, and environmental sustainability. In the plant, the water goes through several treatment processes, including dissolved air flotation, ozonation, filtration and ultraviolet light disinfection. Fluoride and orthophosphate are also added to the water. The Water Treatment Plant allows us to:

  • comply with the requirements of our Operating Licence
  • meet increasingly strict Canadian drinking water quality guidelines,
  • virtually eliminate the risk of waterborne disease,
  • reduce levels of disinfection by-products and
  • significantly improve the taste and odour of the drinking water.

Our Operating Licence requires that we maintain a minimum free chlorine residual of 0.5 milligrams per litre in water leaving the Water Treatment Plant.


We test our water at Shoal Lake, at the Water Treatment Plant raw water inlet and at the Water Treatment Plant treated water outlet once the water has passed through all of the treatment processes. The water then flows from the water treatment plant to the three regional reservoirs and pumping stations before being distributed to Winnipeg homes and businesses.

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

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

Test results are from January 1 to September 30, 2020

What is being measured How it's measured Guideline or regulation Water Treatment Plant treated average Water Treatment Plant treated range
Carbon, Dissolved Organicparts per millionno guideline3.12.0 to 4.9
Carbon, Total Organicparts per millionno guideline2.91.8 to 4.5
Chlorine, Freeparts per millionno guideline1.280.98 to 2.44
Chlorine, Totalparts per millionno guideline1.461.14 to 2.88
Chlorophyll-aparts per billionno guideline<1.0<1.0 to <1.0
Colour, TrueTCUno more than 15 *0.30.0 to 2.0
Conductivitymicrosiemens per centimetreno guideline297279 to 324
Microcystinparts per billionno more than 1.5<0.20<0.20 to <0.20
Odourunitsinoffensive*138 to 20
ORPmillivoltsno guideline581.4507.6 to 629.6
Oxygen, Dissolvedparts per millionno guideline11.68.2 to 14.3
pHunitsbetween 7.0 and 10.57.677.45 to 7.89
Plankton (algae) countcells/mLno guideline<100<100 to <100
Solids, Totalparts per millionno guideline185156 to 222
Solids, Total Dissolvedparts per millionno more than 500 *165138 to 186
Temperaturedegrees Celciusno more than 15 *11.61.9 to 24.2
Turbidity (clearness)NTUno more than 0.3 in 95% of measurements/month, never to exceed 1.0"0.130.09 to 0.25
UV Transmittance, Filteredpercent transmissivityno guideline94.692.5 to 97.2
UV Transmittance, Unfilteredpercent transmissivityno guideline93.391.2 to 96.3
Anions and Nutrients
Alkalinity, Totalparts per million as calcium carbonateno guideline68.361.2 to 77.1
Hardness, Totalparts per million as calcium carbonateno guideline80.772.3 to 90.5
Chlorideparts per millionno more than 250 *4.12.4 to 5.4
Perchlorateparts per billionno guideline<0.20<0.20 to <0.20
Sulphateparts per millionno more than 500 *68.459.9 to 79.1
Escherichia ColiMPN per 100 mLnone detectable per 100 mL00 to 0
Total ColiformsMPN per 100 mLnone detectable per 100 mL00 to 0
Heterotrophic Plate CountCFU per mLno guideline<1<1 to 1
Disinfection By-Products
Aldehydesparts per billionno guideline12.59.0 to 17.1
Bromodichloromethaneparts per billionno guideline1.5<0.5 to 2.4
Haloacetic acidsparts per billionno more than 8013.15.3 to 19.1
Trihalomethanesparts per billionno more than 10016.97.9 to 25.4
Taste and Odours
236 TCA - 2,3,6-trichloroanisoleparts per trillionno guideline<0.48<0.48 to <0.51
246 TCA - 2,4,6-trichloroanisoleparts per trillionno guideline<0.48<0.48 to <0.51
345 TCV - 3,4,5-trichloroveratroleparts per trillionno guideline<0.19<0.19 to <1.50
Geosminparts per trillionno guideline2.25<1.00 to 5.37
IBMP - 2-isobutyl-3-methoxypyrazineparts per trillionno guideline<0.19<0.19 to <0.20
IPMP - 2-isopropyl-3-methoxypyrazineparts per trillionno guideline<0.19<0.19 to <0.20
Dichloromethaneparts per millionno more than 0.05<0.0050<0.0050 to 0.0078
MIB - 2-methylisoborneolparts per trillionno guideline<9.60<9.60 to <10.0
MTBE - methyl tertiary-butyl etherparts per millionno more than 0.015 *<0.0005<0.0005 to <0.0005
NDMA -N-nitrosodimethylamineparts per trillionno more than 403.641.53 to 7.39
Total Metals
Aluminumparts per millionno guideline0.006130.00249 to 0.03896
Antimonyparts per millionno more than 0.0060.000035<0.000025 to 0.000356
Arsenicparts per millionno more than 0.0100.0003010.000225 to 0.000488
Boronparts per millionno more than 50.00429<0.00208 to 0.00936
Cadmiumparts per millionno more than 0.007<0.000007<0.000007 to <0.000007
Calciumparts per millionno guideline21.02718.471 to 25.569
Chromiumparts per millionno more than 0.050.00044<0.00004 to 0.01358
Chromium VIparts per millionno guideline<0.00050<0.00050 to <0.00050
Copperparts per millionno more than 2.00.000901<0.000022 to 0.014543
Ironparts per millionno more than 0.3 *0.072450.03159 to 0.22882
Leadparts per millionno more than 0.005<0.000065<0.000065 to <0.000065
Magnesiumparts per millionno guideline6.3925.569 to 7.812
Manganeseparts per millionno more than 0.120.010450.00634 to 0.02605
Mercuryparts per billionno more than 1<0.0050<0.00050 to <0.0050
Nickelparts per millionno guideline0.0025530.001791 to 0.003072
Potassiumparts per millionno guideline1.3091.082 to 1.743
Sodiumparts per millionno more than 200 *29.57225.674 to 36.565
Uraniumparts per millionno more than 0.02<0.000032<0.000032 to <0.000032
Zincparts per millionno more than 5.0 *0.001440.00019 to 0.01616
Alachlorparts per billionno guideline<0.1000<0.1000 to <0.2000
Aldrinparts per billionno guideline<0.0080<0.0080 to <0.0100
alpha-BHCparts per billionno guideline<0.0080<0.0080 to <0.0100
alpha-Chlordaneparts per billionno guideline<0.0080<0.0080 to <0.0100
alpha-Endosulfanparts per billionno guideline<0.0100<0.0100 to <0.0100
Atrazineparts per billionno more than 5<0.1000<0.1000 to <0.2000
Azinphos-methylparts per billionno more than 20<0.0100<0.0100 to <0.0200
beta-BHCparts per billionno guideline<0.0080<0.0080 to <0.0100
beta-Endosulfanparts per billionno guideline<0.0100<0.0100 to <0.0100
Carbarylparts per billionno more than 90<0.2000<0.2000 to <0.4000
Carbofuranparts per billionno more than 90<0.2000<0.2000 to <0.4000
Chlorothalonilparts per billionno guideline<0.050<0.050 to <0.050
Chlorpyrifosparts per billionno more than 90<0.0050<0.0050 to <0.0100
delta-BHCparts per billionno guideline<0.0080<0.0080 to <0.0100
Diazinonparts per billionno more than 20<0.0050<0.0050 to <0.0100
Diclofop-methylparts per billionno more than 9<0.1000<0.1000 to <0.2000
Dieldrinparts per billionno guideline<0.0080<0.0080 to <0.0100
Dimethoateparts per billionno more than 20<0.1000<0.1000 to <0.2000
Endrinparts per billionno guideline<0.0100<0.0100 to <0.0100
Eptamparts per billionno guideline<2.00<2.00 to <2.00
gamma-Chlordaneparts per billionno guideline<0.0080<0.0080 to <0.0100
Heptachlorparts per billionno guideline<0.0080<0.0080 to <0.0100
Heptachlor Epoxideparts per billionno guideline<0.0080<0.0080 to <0.0100
Lindane (gamma-BHC)parts per billionno guideline<0.0080<0.0080 to <0.0100
Malathionparts per billionno more than 190<0.1000<0.1000 to <0.2000
Methoxychlorparts per billionno guideline<0.0080<0.0080 to <0.0100
Methyl Parathionparts per billionno guideline<0.1000<0.1000 to <0.2000
Metribuzinparts per billionno more than 80<0.2000<0.2000 to <0.4000
Mirexparts per billionno guideline<0.0080<0.0080 to <0.0100
o,p-DDDparts per billionno guideline<0.0100><0.0040 to <0.0100
o,p-DDEparts per billionno guideline<0.0100<0.0040 to <0.0100
o,p-DDTparts per billionno guideline<0.0100<0.0040 to <0.0100
p,p-DDDparts per billionno guideline<0.0100<0.0040 to <0.0100
p,p-DDEparts per billionno guideline<0.0100<0.0040 to <0.0100
p,p-DDTparts per billionno guideline<0.0100<0.0040 to <0.0100
Parathionparts per billionno guideline<0.0130<0.0130 to <0.0260
Propaclorparts per billionno guideline<0.200<0.200 to <0.200
Propanilparts per billionno guideline<0.200<0.200 to <0.200
Propoxurparts per billionno guideline<0.200<0.200 to <0.200
Simazineparts per billionno more than 10<0.1000<0.1000 to <0.2000
Terbufosparts per billionno more than 1<0.1000<0.1000 to <0.2000
Triallateparts per billionno guideline<0.1000<0.1000 to <0.2000
Trichlopyrparts per billionno guideline<0.0500<0.0500 to <0.0500
Trifluralinparts per billionno more than 45<0.0300<0.0300 to <0.0600
Polychlorinated Biphenyls
Arochlor 1016parts per billionno guideline<0.020<0.020 to <0.020
Arochlor 1221parts per billionno guideline<0.020<0.020 to <0.020
Arochlor 1232parts per billionno guideline<0.020<0.020 to <0.020
Arochlor 1242parts per billionno guideline<0.020<0.020 to <0.020
Arochlor 1248parts per billionno guideline<0.020<0.020 to <0.020
Arochlor 1254parts per billionno guideline<0.020<0.020 to <0.020
Arochlor 1260parts per billionno guideline<0.020<0.020 to <0.020
Phenoxy Acid Herbicides
2,4,5-Tparts per billionno guideline<0.5000<0.5000 to <0.5000
2,4,5-TPparts per billionno guideline<0.5000<0.5000 to <0.5000
2,4-Dparts per billionno more than 100<0.5000<0.5000 to <0.5000
2,4-DBparts per billionno guideline<0.0500<0.0500 to <0.0500
2,4-DPparts per billionno guideline<0.5000<0.5000 to <0.5000
Bromoxynilparts per billionno more than 5<0.5000<0.5000 to <0.5000
Dicambaparts per billionno more than 1200.0075<0.0060 to 0.0164
Dinosebparts per billionno guideline<0.5000<0.5000 to <0.5000
MCPAparts per billionno more than 100<0.5000<0.5000 to <0.5000
MCPBparts per billionno guideline<0.0500<0.0500 to <0.0500
Mecopropparts per billionno guideline<0.5000<0.5000 to <0.5000
Picloramparts per billionno more than 190<0.5000<0.5000 to <0.5000

* Aesthetic objective: These guidelines have an objective and not a maximum acceptable limit. These parameters should not impact the safety of the water to drink and there is no anticipated health risk for short-term exposures.

Guidelines from 'Summary of Guidelines for Canadian Drinking Water Quality' by Health Canada, September 2020

Results in red are over acceptable limits per guideline.

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

Last updated: December 23, 2020

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