2022 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 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 December 31, 2022

What is being measured	How it's measured	Water Treatment Plant raw average	Water Treatment Plant raw range
Miscellaneous
Carbon, Dissolved Organic	parts per million	8.2	6.6 to 10.6
Carbon, Total Organic	parts per million	7.6	6.4 to 9.8
Chlorine, Free	parts per million	<0.02	<0.02 to 0.07
Chlorine, Total	parts per million	0.02	<0.02 to 0.08
Chlorophyll-a	parts per billion	4.8	<1.0 to 11.2
Colour, Apparent	TCU	15.3	10.0 to 26.0
Colour, True	TCU	8.2	<5.0 to 12.0
Conductivity	microsiemens per centimetre	165	149 to 188
Langelier Index (4 C)	units	-0.43	-0.53 to -0.27
Langelier Index (60 C)	units	0.35	0.25 to 0.51
Microcystin	parts per billion	<0.20	<0.20 to 0.21
Odour	units	89	75 to 150
ORP	millivolts	475.1	390.9 to 520.2
Oxygen, Dissolved	parts per million	11.0	6.2 to 13.6
pH	units	7.87	7.50 to 8.39
Plankton (algae) count	cells/mL	13,892	257 to 48,820
Solids, Total	parts per million	110	88 to 130
Solids, Total Dissolved	parts per million	89	53 to 119
Temperature	degrees Celcius	9.2	1.3 to 22.5
Turbidity (clearness)	NTU	0.91	0.41 to 2.43
UV Transmittance, Filtered	percent transmissivity	75.1	69.2 to 79.3
UV Transmittance, Unfiltered	percent transmissivity	73.4	68.1 to 78.3
Anions and Nutrients
Alkalinity, Total	parts per million as calcium carbonate	76.3	66.6 to 89.9
Alkalinity, Bicarbonate	parts per million	92.5	83.3 to 109.0
Alkalinity, Carbonate	parts per million	<0.60	<0.60 to <0.60
Alkalinity, Hydroxide	parts per million	<0.34	<0.34 to <0.34
Hardness, Total	parts per million as calcium carbonate	80.0	69.8 to 92.4
Ammonia	parts per million	0.04	<0.01 to 0.08
Bromide	parts per million	<0.010	<0.010 to 0.020
Chloride	parts per million	2.2	1.6 to 5.3
Fluoride	parts per million	0.058	0.051 to 0.067
Nitrate Nitrogen	parts per million	0.018	<0.005 to 0.041
Nitrite	parts per million	<0.001	<0.001 to 0.001
Perchlorate	parts per billion	<0.20	<0.20 to <0.20
Phosphorus,Total	parts per million	<0.030	<0.030 to <0.050
Sulphate	parts per million	1.8	<0.4 to 5.9
Disinfection By-Products
Haloacetic acids	parts per billion	<1.2	<1.2 to 1.7
Trihalomethanes	parts per billion	<1.3	<1.3 to <2.7
Enteric Protozoa
Cryptosporidium	oocysts per 100 L	0	0 to 0
Giardia	cysts per 100 L	0	0 to 0
Total Metals
Aluminum	parts per million	0.00217	0.00080 to 0.00579
Antimony	parts per million	0.000038	<0.000025 to 0.000219
Arsenic	parts per million	0.000843	0.000597 to 0.001260
Barium	parts per million	0.0161	0.0148 to 0.0177
Beryllium	parts per million	<0.00010	<0.00010 to <0.00010
Bismuth	parts per million	<0.000050	<0.000050 to <0.000050
Boron	parts per million	0.00565	<0.00208 to 0.01500
Cadmium	parts per million	<0.000005	<0.000005 to 0.0000110
Calcium	parts per million	20.337	16.554 to 25.619
Cesium	parts per million	<0.000010	<0.000010 to <0.000010
Chromium	parts per million	<0.000040	<0.000040 to 0.000270
Chromium VI	parts per million	<0.00050	<0.00050 to <0.00050
Cobalt	parts per million	<0.00010	<0.00010 to <0.00010
Copper	parts per million	0.000261	<0.000022 to 0.000643
Iron	parts per million	0.05581	0.02117 to 0.11037
Lead	parts per million	<0.000050	<0.000050 to <0.000065
Lithium	parts per million	0.0020	<0.0010 to 0.0030
Magnesium	parts per million	6.136	4.770 to 7.680
Manganese	parts per million	0.01126	0.00323 to 0.04890
Mercury	parts per billion	<0.0050	<0.00050 to <0.0050
Molybdenum	parts per million	0.000152	0.000133 to 0.000181
Nickel	parts per million	0.000243	<0.000021 to 0.000459
Potassium	parts per million	1.238	0.997 to 1.556
Rubidium	parts per million	0.0018	0.0015 to 0.0021
Selenium	parts per million	0.000088	0.000062 to 0.000114
Silicon	parts per million	2.16	0.62 to 3.37
Silver	parts per million	<0.000010	<0.000010 to <0.000010
Sodium	parts per million	2.361	1.968 to 2.966
Strontium	parts per million	0.0386	0.0350 to 0.0459
Tellurium	parts per million	<0.00020	<0.00020 to <0.00020
Thallium	parts per million	<0.000010	<0.000010 to <0.000010
Thorium	parts per million	<0.00010	<0.00010 to <0.00010
Tin	parts per million	<0.00010	<0.00010 to <0.00010
Titanium	parts per million	<0.00030	<0.00030 to <0.00030
Tungsten	parts per million	<0.00010	<0.00010 to <0.00010
Uranium	parts per million	<0.000032	<0.000032 to 0.000070
Vanadium	parts per million	<0.00050	<0.00050 to <0.00050
Zinc	parts per million	0.00066	<0.00011 to 0.00610
Zirconium	parts per million	<0.00020	<0.00020 to <0.00020
Pesticides
Alachlor	parts per billion	<0.10	<0.10 to <0.10
Aldrin	parts per billion	<0.010	<0.010 to <0.010
alpha-BHC	parts per billion	<0.010	<0.010 to <0.010
alpha-Chlordane	parts per billion	<0.010	<0.010 to <0.010
alpha-Endosulfan	parts per billion	<0.010	<0.010 to <0.010
Atrazine	parts per billion	<0.10	<0.10 to <0.10
Azinphos-methyl	parts per billion	<0.010	<0.010 to <0.010
beta-BHC	parts per billion	<0.010	<0.010 to <0.010
beta-Endosulfan	parts per billion	<0.010	<0.010 to <0.010
Carbaryl	parts per billion	<0.20	<0.20 to <0.20
Carbofuran	parts per billion	<0.20	<0.20 to <0.20
Chlorpyrifos	parts per billion	<0.0050	<0.0050 to <0.0050
delta-BHC	parts per billion	<0.010	<0.010 to <0.010
Diazinon	parts per billion	<0.0050	<0.0050 to <0.0050
Diclofop-methyl	parts per billion	<0.10	<0.10 to <0.10
Dieldrin	parts per billion	<0.010	<0.010 to <0.010
Dimethoate	parts per billion	<0.10	<0.10 to <0.10
Endrin	parts per billion	<0.010	<0.010 to <0.010
Eptam	parts per billion	<0.20	<0.20 to <0.20
gamma-Chlordane	parts per billion	<0.010	<0.010 to <0.010
Heptachlor	parts per billion	<0.010	<0.010 to <0.010
Heptachlor Epoxide	parts per billion	<0.010	<0.010 to <0.010
Lindane (gamma-BHC)	parts per billion	<0.010	<0.010 to <0.010
Malathion	parts per billion	<0.10	<0.10 to <0.10
Methoxychlor	parts per billion	<0.010	<0.010 to <0.010
Methyl Parathion	parts per billion	<0.10	<0.10 to <0.10
Metribuzin	parts per billion	<0.20	<0.20 to <0.20
Mirex	parts per billion	<0.010	<0.010 to <0.010
o,p-DDD	parts per billion	<0.010	<0.010 to <0.010
o,p-DDE	parts per billion	<0.010	<0.010 to <0.010
o,p-DDT	parts per billion	<0.010	<0.010 to <0.010
p,p-DDD	parts per billion	<0.010	<0.010 to <0.010
p,p-DDE	parts per billion	<0.010	<0.010 to <0.010
p,p-DDT	parts per billion	<0.010	<0.010 to <0.010
Parathion	parts per billion	<0.0130	<0.0130 to <0.0130
Propaclor	parts per billion	<0.20	<0.20 to <0.20
Propanil	parts per billion	<0.20	<0.20 to <0.20
Propoxur	parts per billion	<0.20	<0.20 to <0.20
Simazine	parts per billion	<0.10	<0.10 to <0.10
Terbufos	parts per billion	<0.10	<0.10 to <0.10
Triallate	parts per billion	<0.10	<0.10 to <0.10
Trichlopyr	parts per billion	<0.050	<0.050 to <0.050
Trifluralin	parts per billion	<0.030	<0.030 to <0.030
Bacteria
Escherichia Coli	MPN per 100 mL	26	0 to >200
Total Coliforms	MPN per 100 mL	80	0 to >200
Heterotrophic Plate Count	CFU per mL	111	2 to >300
Taste and Odours
236 TCA - 2,3,6-trichloroanisole	parts per trillion	<0.96	<0.96 to <2.04
246 TCA - 2,4,6-trichloroanisole	parts per trillion	<0.51	<0.51 to <0.96
345 TCV - 3,4,5-trichloroveratrole	parts per trillion	<0.20	<0.20 to <0.38
Geosmin	parts per trillion	2.0	1.2 to 3.1
IBMP - 2-isobutyl-3-methoxypyrazine	parts per trillion	<0.20	<0.20 to <0.38
IPMP - 2-isopropyl-3-methoxypyrazine	parts per trillion	<0.20	<0.20 to <0.38
Dichloromethane	parts per million	<0.0050	<0.0050 to <0.0050
MIB - 2-methylisoborneol	parts per trillion	<10.1	<10.1 to <19.2
MTBE - methyl tertiary-butyl ether	parts per million	<0.0005	<0.0005 to <0.0005
NDMA - N-nitrosodimethylamine	parts per trillion	<0.001	<0.001 to <0.001
Polychlorinated Biphenyls
Arochlor 1016	parts per billion	<0.020	<0.020 to <0.020
Arochlor 1221	parts per billion	<0.020	<0.020 to <0.020
Arochlor 1232	parts per billion	<0.020	<0.020 to <0.020
Arochlor 1242	parts per billion	<0.020	<0.020 to <0.020
Arochlor 1248	parts per billion	<0.020	<0.020 to <0.020
Arochlor 1254	parts per billion	<0.020	<0.020 to <0.020
Arochlor 1260	parts per billion	<0.020	<0.020 to <0.020
Phenoxy Acid Herbicides
2,4,5-T	parts per billion	<0.50	<0.50 to <0.50
2,4,5-TP	parts per billion	<0.50	<0.50 to <0.50
2,4-D	parts per billion	<0.50	<0.50 to <0.50
2,4-DB	parts per billion	<0.050	<0.050 to <0.050
2,4-DP	parts per billion	<0.50	<0.50 to <0.50
Bromoxynil	parts per billion	<0.50	<0.50 to <0.50
Dicamba	parts per billion	<0.120	<0.006 to <0.120
Dinoseb	parts per billion	<0.50	<0.50 to <0.50
MCPA	parts per billion	<0.50	<0.50 to <0.50
MCPB	parts per billion	<0.050	<0.050 to <0.050
Mecoprop	parts per billion	<0.50	<0.50 to <0.50
Picloram	parts per billion	<0.50	<0.50 to <0.50

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.