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Image of Deacon Reservoir2010 Water Treatment Plant raw water quality test results

The 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.

Testing
We test the raw water at the Water Treatment Plant on a continuous 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

In addition to this routine testing, the Province subsidizes the cost of testing the water for further contaminants including:

  • metals
  • herbicides and pesticides
  • PCBs
What is being measured How it's measured Guideline or regulation Water Treatment Plant raw average Water Treatment Plant raw range Comments
Odour units Inoffensive 95 40 to 200 Raw water - guideline does not apply
Geosmin* parts per trillion no guideline 5.7 <0.5 to 71 Common taste and odour compound
IPMP - 2-isopropyl-3-methoxypyrazine* parts per trillion no guideline <0.5 <0.5 to <0.5 Common taste and odour compound
IBMP - 2-isobutyl-3-methoxypyrazine* parts per trillion no guideline <0.5 <0.5 to <0.5 Common taste and odour compound
MIB - 2-methylisoborneol* parts per trillion no guideline <1.0 <0.5 to 2.0 Common taste and odour compound
246 TCA - 2,4,6-trichloroanisole* parts per trillion no guideline <0.5 <0.5 to <1.2 Common taste and odour compound
236 TCA - 2,3,6-trichloroanisole* parts per trillion no guideline <0.5 <0.5 to <0.8 Common taste and odour compound
345 TCV - 3,4,5-trichloroveratrole* parts per trillion no guideline <0.5 <0.5 to <0.5 Common taste and odour compound
MTBE - methyl tertiary-butyl ether* parts per million no more than 0.015 <0.0005 <0.0005 to <0.0005 Raw water - guideline does not apply
NDMA - N-nitrosodimethylamine* parts per billion under review 0.0024 0.0006 to 0.0064 Guideline under review by Health Canada
Plankton (algae) count cells per millilitre no guideline 36,156 1,200 to 215,200 Algae contribute to odours and may cause filter clogging
Chlorophyll-a** parts per billion no guideline 5 <1 to 30 Chlorophyll is found in algae
Microcystin LR* parts per billion no more than 1.5 <0.2 <0.2 to <0.2 Raw water - guideline does not apply
Cryptosporidium** oocysts per 100 litres no guideline <1 <1 to <1 15 samples taken in 2010 - no positive results
Giardia** cysts per 100 litres no guideline <1 <1 to <1 15 samples taken in 2010 - no positive results
Turbidity (clearness) Nephelometric turbidity units no guideline 1.27 0.17 to 5.40  -
Colour, Apparent Apparent colour units no guideline 3.8 2.5 to 17.5  -
Total Solids parts per million no guideline 107 66 to 284  -
Total Dissolved Solids parts per million no more than 500 94 60 to 136 Raw water - guideline does not apply
Conductivity microsiemens per centimetre no guideline 155 139 to 173 Another measure of dissolved solids
pH units between 6.5 and 8.5 8.04 7.47 to 8.72 Raw water - guideline does not apply
Temperature degrees Celcius no more than 15 9.8 0.0 to 24.0 Raw water - guideline does not apply
Total Alkalinity parts per million as calcium carbonate no guideline 73 68 to 78  -
Total Hardness parts per million as calcium carbonate between 80 and 100 77 70 to 84 80 to 100 parts per million is recommended
Total Organic Carbon* parts per million no guideline 10 7 to 27  -
Dissolved Organic Carbon parts per million no guideline 9 6 to 26  -
Total Inorganic Carbon parts per million no guideline 15.8 13.6 to 17.9  -
Total Phosphorus* parts per million no guideline <0.20 <0.20 to <0.20 Phosphorus can contribute to algae growth
Ammonia Dissolved* parts per million no guideline 0.043 0.024 to 0.109  -
Nitrate Nitrogen* parts per million no more than 10 <0.050 <0.050 to <0.050 Raw water - guideline does not apply
Chloride parts per million no more than 250 <5 <5 to 6 Raw water - guideline does not apply
Sulfate parts per million no more than 500 <5 <5 to <5 Raw water - guideline does not apply
UV Transmittance (Filtered) percent transmissivity no guideline 77.5 72.9 to 94.7  -
UV Transmittance (Unfiltered) percent transmissivity no guideline 75.6 69.4 to 94.3  -
Chlorine (free) parts per million no guideline 0.02 <0.02 to 0.10  -
Chlorine (total) parts per million no guideline 0.06 <0.02 to 0.22  -
Trihalomethanes parts per billion no more than 100 22 <0.5 to 95 Raw water - guideline does not apply
Haloacetic acids parts per billion no more than 80 12 <5 to 50 Raw water - guideline does not apply
Aldehydes* parts per billion no guideline <2 <2 to 6  -
Tetrachloroethylene* parts per billion no more than 30 <0.50 <0.50 to <0.50 Meets the guideline
1,1,1-Trichloroethane* parts per billion no guideline <0.50 <0.50 to <0.50  -
1,1,2-Trichloroethane* parts per billion no guideline <0.50 <0.50 to <0.50  -
Trichloroethylene* parts per billion no more than 5 <0.50 <0.50 to <0.50 Meets the guideline
Carbofuran* parts per billion no more than 90 <0.20 <0.20 to <0.20 Meets the guideline
Propoxur* parts per billion no more than 0.7 <0.20 <0.20 to <0.20 Meets the guideline
Aldrin* parts per billion no more than 0.7 <0.010 <0.010 to <0.010 Meets the guideline
Lindane (gamma-BHC)* parts per billion no guideline <0.010 <0.010 to <0.010  -
alpha-Chlordane* parts per billion no guideline <0.010 <0.010 to <0.010  -
gamma-Chlordane* parts per billion no guideline <0.010 <0.010 to <0.010  -
p,p-DDT* parts per billion no guideline <0.010 <0.010 to <0.010  -
Dieldrin* parts per billion no more than 0.7 <0.010 <0.010 to <0.010 Meets the guideline
Heptachlor* parts per billion no guideline <0.010 <0.010 to <0.010  -
Heptachlor Epoxide* parts per billion no guideline <0.010 <0.010 to <0.010  -
Methoxychlor* parts per billion no more than 900 <0.010 <0.010 to <0.010 Meets the guideline
alpha-BHC* parts per billion no guideline <0.010 <0.010 to <0.010  -
beta-BHC* parts per billion no guideline <0.010 <0.010 to <0.010  -
delta-BHC* parts per billion no guideline <0.010 <0.010 to <0.010  -
p,p-DDD* parts per billion no guideline <0.010 <0.010 to <0.010  -
p,p-DDE* parts per billion no guideline <0.010 <0.010 to <0.010  -
o,p-DDD* parts per billion no guideline <0.010 <0.010 to <0.010  -
o,p-DDE* parts per billion no guideline <0.010 <0.010 to <0.010  -
o,p-DDT* parts per billion no guideline <0.010 <0.010 to <0.010  -
Alpha Endosulfan* parts per billion no guideline <0.010 <0.010 to <0.010  -
Beta Endosulfan* parts per billion no guideline <0.010 <0.010 to <0.010  -
Endrin* parts per billion no guideline <0.010 <0.010 to <0.010  -
Mirex* parts per billion no guideline <0.010 <0.010 to <0.010  -
Simazine* parts per billion no more than 10 <0.10 <0.10 to <0.10 Meets the guideline
Alachlor* parts per billion no guideline <0.10 <0.10 to <0.10  -
Atrazine* parts per billion no more than 5 <0.10 <0.10 to <0.10 Meets the guideline
Metribuzin* parts per billion no more than 80 <0.20 <0.20 to <0.20 Meets the guideline
Azinphosmethyl* parts per billion no more than 20 <0.10 <0.10 to <0.10 Meets the guideline
Chlorpyrifos* parts per billion no more than 90 <0.10 <0.10 to <0.10 Meets the guideline
Diazinon* parts per billion no more than 20 <0.10 <0.10 to <0.10 Meets the guideline
Dimethoate* parts per billion no more than 20 <0.10 <0.10 to <0.10 Meets the guideline
Malathion* parts per billion no more than 190 <0.10 <0.10 to <0.10 Meets the guideline
Parathion* parts per billion no more than 50 <0.10 <0.10 to <0.10 Meets the guideline
Terbufos* parts per billion no more than 1 <0.10 <0.10 to <0.10 Meets the guideline
Methyl Parathion* parts per billion no guideline <0.10 <0.10 to <0.10  -
2,4-D* parts per billion no more than 100 <0.050 <0.050 to <0.050 Meets the guideline
2,4-DB* parts per billion no guideline <0.050 <0.050 to <0.050  -
2,4-DP* parts per billion no guideline <0.050 <0.050 to <0.050  -
2,4,5-T* parts per billion no guideline <0.050 <0.050 to <0.050  -
2,4,5-TP* parts per billion no guideline <0.050 <0.050 to <0.050  -
Bromoxynil* parts per billion no more than 5 <0.020 <0.020 to <0.020 Meets the guideline
Dicamba* parts per billion no more than 120 <0.0060 <0.0060 to <0.0060 Meets the guideline
Dinoseb* parts per billion no more than 10 <0.050 <0.050 to <0.050 Meets the guideline
MCPA* parts per billion no more than 100 <0.025 <0.025 to <0.025  -
MCPB* parts per billion no guideline <0.050 <0.050 to <0.050  -
Mecoprop* parts per billion no guideline <0.060 <0.060 to <0.060  -
Picloram* parts per billion no more than 190 <0.20 <0.20 to <0.20 Meets the guideline
Trichlopyr* parts per billion no guideline <0.050 <0.050 to <0.050  -
Diclofop-methyl* parts per billion no more than 9 <0.10 <0.10 to <0.10 Meets the guideline
Eptam* parts per billion no guideline <0.20 <0.20 to <0.20  -
Propaclor* parts per billion no guideline <0.20 <0.20 to <0.20  -
Propanil* parts per billion no guideline <0.20 <0.20 to <0.20  -
Triallate* parts per billion no guideline <0.10 <0.10 to <0.10  -
Trifluralin* parts per billion no more than 45 <0.030 <0.030 to <0.030 Meets the guideline
Arochlor 1016* parts per billion no guideline <0.020 <0.020 to <0.020  -
Arochlor 1221* parts per billion no guideline <0.020 <0.020 to <0.020  -
Arochlor 1232* parts per billion no guideline <0.020 <0.020 to <0.020  -
Arochlor 1242* parts per billion no guideline <0.020 <0.020 to <0.020  -
Arochlor 1248* parts per billion no guideline <0.020 <0.020 to <0.020  -
Arochlor 1254* parts per billion no guideline <0.020 <0.020 to <0.020  -
Arochlor 1260* parts per billion no guideline <0.020 <0.020 to <0.020  -
Calcium* parts per million no guideline 21.1 18.3 to 24.0 Contributes to hardness
Magnesium* parts per million no guideline 5.94 5.22 to 6.99 Contributes to hardness
Sodium parts per million no more than 200 23.0 1.8 to 4.7 Raw water - guideline does not apply
Potassium* parts per million no guideline 1.24 1.10 to 1.39  -
Iron parts per million no more than 0.3 0.05 <0.01 to 0.23 Raw water - guideline does not apply
Copper* parts per million no more than 1.0 0.00252 <0.00100 to 0.00581 Raw water - guideline does not apply
Lead* parts per million no more than 0.010 <0.000090 <0.000090 to 0.000188 Raw water - guideline does not apply
Aluminum* parts per million no more than 0.1 0.0119 0.0062 to 0.0152 Raw water - guideline does not apply
Arsenic* parts per million no more than 0.010 0.00084 0.00065 to 0.00100 Raw water - guideline does not apply
Chromium* parts per million no more than 0.05 <0.0010 <0.0010 to <0.0010 Raw water - guideline does not apply
Nickel* parts per million no guideline <0.0020 <0.0020 to <0.0020  -
Cadmium* parts per million no more than 0.005 <0.000010 <0.000010 to <0.000010 Raw water - guideline does not apply
Manganese* parts per million no more than 0.05 0.0134 0.0070 to 0.0231 Raw water - guideline does not apply
Zinc* parts per million no more than 5.0 <0.0050 <0.0050 to <0.0050 Raw water - guideline does not apply
Mercury** parts per million no more than 0.001 <0.000001 <0.000001 to <0.000001 Raw water - guideline does not apply
Antimony* parts per million no more than 0.006 <0.00020 <0.00020 to 0.00021 Raw water - guideline does not apply
Barium* parts per million no more than 1 0.0149 0.0138 to 0.0165 Raw water - guideline does not apply
Beryllium* parts per million no guideline <0.00020 <0.00020 to <0.00020  -
Bismuth* parts per million no guideline <0.00020 <0.00020 to <0.00020  -
Boron* parts per million no more than 5 0.028 <0.010 to 0.103 Raw water - guideline does not apply
Cesium* parts per million no guideline <0.00010 <0.00010 to <0.00010  -
Cobalt* parts per million no guideline <0.00020 <0.00020 to <0.00020  -
Lithium* parts per million no guideline 0.0028 <0.0020 to 0.0048  -
Molybdenum* parts per million no guideline <0.00020 <0.00020 to <0.00020  -
Rubidium* parts per million no guideline 0.00178 0.00157 to 0.00196  -
Selenium* parts per million no more than 0.01 <0.0010 <0.0010 to <0.0010 Raw water - guideline does not apply
Silicon* parts per million no guideline 0.801 0.139 to 2.040  -
Silver* parts per million no guideline <0.00010 <0.00010 to <0.00010  -
Strontium* parts per million no guideline 0.0386 0.0349 to 0.0433  -
Tellurium* parts per million no guideline <0.00020 <0.00020 to <0.00020  -
Thallium* parts per million no guideline <0.00010 <0.00010 to <0.00010  -
Thorium* parts per million no guideline <0.00010 <0.00010 to <0.00010  -
Tin* parts per million no guideline 0.00033 <0.00020 to 0.00106  -
Titanium* parts per million no guideline 0.00040 <0.00020 to 0.00069  -
Tungsten* parts per million no guideline <0.0010 <0.00020 to <0.0010  -
Uranium* parts per million no more than 0.02 <0.00010 <0.00010 to <0.00010 Raw water - guideline does not apply
Vanadium* parts per million no guideline 0.00021 <0.00020 to 0.00055  -
Zirconium* parts per million no guideline <0.00040 <0.00040 to <0.00040  -
* Data reported was collected from Deacon Outlet Cell 1/3 from January to June and from Water Treatment Plant - Raw Water from July to December.
** Data reported was collected from Deacon Outlet Cell 1/3.
  Guidelines from 'Summary of Guidelines for Canadian Drinking Water Quality' by Health Canada, revised February 1, 2011.

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Last updated: June 23, 2016