2023 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, 2023

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	8.6	6.3 to 14.5
Carbon, Total Organic	parts per million	8.7	6.8 to 15.6
Chlorine, Free	parts per million	0.02	<0.02 to 0.10
Chlorine, Total	parts per million	0.03	<0.02 to 0.12
Chlorophyll-a	parts per billion	4.8	<1.0 to 13.4
Colour, Apparent	TCU	15.5	10.0 to 24.0
Colour, True	TCU	9.8	5.0 to 14.0
Conductivity	microsiemens per centimetre	166	154 to 182
Langelier Index (4 C)	units	-0.43	-0.56 to -0.32
Langelier Index (60 C)	units	0.35	0.22 to 0.45
Microcystin	parts per billion	<0.20	<0.20 to <0.20
Odour	units	92	70 to 150
ORP	millivolts	442.0	294.1 to 558.8
Oxygen, Dissolved	parts per million	10.6	7.1 to 13.5
pH	units	7.83	6.98 to 8.50
Plankton (algae) count	cells/mL	25,456	<100 to 213,200
Solids, Total	parts per million	113	99 to 172
Solids, Total Dissolved	parts per million	94	60 to 144
Temperature	degrees Celcius	9.9	1.2 to 23.4
Turbidity (clearness)	NTU	0.88	0.37 to 3.13
UV Transmittance, Filtered	percent transmissivity	72.9	67.6 to 78.7
UV Transmittance, Unfiltered	percent transmissivity	71.0	65.8 to 76.7
Anions and Nutrients
Alkalinity, Total	parts per million as calcium carbonate	75.4	64.6 to 83.6
Alkalinity, Bicarbonate	parts per million	83.5	71.5 to 100.0
Alkalinity, Carbonate	parts per million	<0.60	<0.60 to <1.0
Alkalinity, Hydroxide	parts per million	<0.34	<0.34 to <1.0
Hardness, Total	parts per million as calcium carbonate	81.4	73.8 to 99.6
Ammonia	parts per million	0.02	<0.01 to 0.05
Bromide	parts per million	<0.050	<0.010 to <0.050
Chloride	parts per million	2.1	1.3 to 2.9
Fluoride	parts per million	0.060	0.057 to 0.063
Nitrate Nitrogen	parts per million	0.033	<0.0050 to 0.079
Nitrite	parts per million	0.002	<0.0010 to 0.006
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	<0.4	<0.4 to 0.7
Disinfection By-Products
Haloacetic acids	parts per billion	<1.2	<1.2 to <1.2
Trihalomethanes	parts per billion	<2.7	<2.7 to <2.7
Enteric Protozoa
Cryptosporidium	oocysts per 100 L	<0.1	<0.1 to <0.1
Giardia	cysts per 100 L	<0.1	<0.1 to <0.1
Total Metals
Aluminum	parts per million	0.00250	0.00103 to 0.01413
Antimony	parts per million	0.000086	<0.000025 to 0.000225
Arsenic	parts per million	0.000891	0.000484 to 0.001403
Barium	parts per million	0.0158	0.0144 to 0.0183
Beryllium	parts per million	<0.00010	<0.00002 to <0.00010
Bismuth	parts per million	<0.000050	<0.000050 to <0.000050
Boron	parts per million	0.01139	0.00803 to 0.01800
Cadmium	parts per million	<0.000005	<0.000005 to <0.000007
Calcium	parts per million	20.570	16.667 to 25.757
Cesium	parts per million	<0.000010	<0.000010 to <0.000010
Chromium	parts per million	<0.000040	<0.000040 to <0.00050
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	0.000450	0.000091 to 0.002240
Iron	parts per million	0.07874	0.01865 to 0.33450
Lead	parts per million	<0.000050	<0.000050 to <0.000065
Lithium	parts per million	0.0023	0.0017 to 0.0025
Magnesium	parts per million	6.187	5.066 to 7.260
Manganese	parts per million	0.01230	0.00289 to 0.06894
Mercury	parts per billion	<0.0050	<0.0050 to <0.0050
Molybdenum	parts per million	0.000163	0.000142 to 0.000189
Nickel	parts per million	0.000299	<0.000021 to 0.000640
Potassium	parts per million	1.245	0.970 to 1.472
Rubidium	parts per million	0.0018	0.0016 to 0.0020
Selenium	parts per million	0.000076	<0.000050 to 0.000122
Silicon	parts per million	1.98	0.51 to 3.63
Silver	parts per million	<0.000010	<0.000010 to <0.000010
Sodium	parts per million	2.334	1.983 to 2.685
Strontium	parts per million	0.0406	0.0369 to 0.0438
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	0.000048	<0.000032 to 0.000116
Vanadium	parts per million	<0.00050	<0.00050 to <0.00050
Zinc	parts per million	0.00065	<0.00011 to 0.00459
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	<0.0080	<0.0080 to <0.0080
alpha-HCH	parts per billion	<0.0080	<0.0080 to <0.0080
alpha-Chlordane	parts per billion	<0.0080	<0.0080 to <0.0080
alpha-Endosulfan	parts per billion	<0.0070	<0.0070 to <0.0070
Atrazine	parts per billion	<0.10	<0.10 to <0.10
Azinphos-methyl	parts per billion	<0.10	<0.10 to <0.10
beta-HCH	parts per billion	<0.0080	<0.0080 to <0.0080
beta-Endosulfan	parts per billion	<0.0070	<0.0070 to <0.0070
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	<0.10	<0.10 to <0.10
delta-HCH	parts per billion	<0.0080	<0.0080 to <0.0080
Diazinon	parts per billion	<0.10	<0.10 to <0.10
Diclofop-methyl	parts per billion	<0.10	<0.10 to <0.10
Dieldrin	parts per billion	<0.0080	<0.0080 to <0.0080
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	<0.0080	<0.0080 to <0.0080
Heptachlor	parts per billion	<0.0080	<0.0080 to <0.0080
Heptachlor Epoxide	parts per billion	<0.0080	<0.0080 to <0.0080
Lindane (gamma-HCH)	parts per billion	<0.0080	<0.0080 to <0.0080
Malathion	parts per billion	<0.10	<0.10 to <0.10
Methoxychlor	parts per billion	<0.0080	<0.0080 to <0.0080
Methyl Parathion	parts per billion	<0.10	<0.10 to <0.10
Metribuzin	parts per billion	<0.10	<0.10 to <0.10
Mirex	parts per billion	<0.0080	<0.0080 to <0.0080
o,p-DDD	parts per billion	<0.0040	<0.0040 to <0.0040
o,p-DDE	parts per billion	<0.0040	<0.0040 to <0.0040
o,p-DDT	parts per billion	<0.0040	<0.0040 to <0.0040
p,p-DDD	parts per billion	<0.0040	<0.0040 to <0.0040
p,p-DDE	parts per billion	<0.0040	<0.0040 to <0.0040
p,p-DDT	parts per billion	<0.0040	<0.0040 to <0.0040
Parathion	parts per billion	<0.10	<0.10 to <0.10
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	<0.50	<0.050 to <0.50
Trifluralin	parts per billion	<0.10	<0.10 to <0.10
Bacteria
Escherichia Coli	MPN per 100 mL	28	<1 to >200
Total Coliforms	MPN per 100 mL	89	<1 to >200
Heterotrophic Plate Count	CFU per mL	151	6 to >300
Taste and Odours
Dichloromethane	parts per billion	<1.0	<1.0 to <1.0
MTBE - methyl tertiary-butyl ether	parts per billion	<0.50	<0.50 to <0.50
NDMA - N-nitrosodimethylamine	parts per billion	<0.033	<0.033 to <0.10
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	<0.050 to <0.50
2,4,5-TP	parts per billion	<0.50	<0.050 to <0.50
2,4-D	parts per billion	<0.50	<0.050 to <0.50
2,4-DB	parts per billion	<0.50	<0.050 to <0.50
2,4-DP	parts per billion	<0.50	<0.050 to <0.50
Bromoxynil	parts per billion	<0.50	<0.050 to <0.50
Dicamba	parts per billion	<1.0	<0.10 to <1.0
Dinoseb	parts per billion	<0.50	<0.050 to <0.50
MCPA	parts per billion	<0.50	<0.050 to <0.50
MCPB	parts per billion	<0.50	<0.050 to <0.50
Mecoprop	parts per billion	<0.50	<0.050 to <0.50
Picloram	parts per billion	<1.0	<0.10 to <1.0

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.