2024 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, 2024

What is being measured	How it's measured	No. of samples	Water Treatment Plant raw average	Water Treatment Plant raw range
Miscellaneous
Carbon,   Dissolved Organic	parts per million	47	8.7	6.8	10.4
Carbon, Total   Organic	parts per million	59	8.2	6.6	10.0
Chlorine, Free	parts per million	249	0.02	<0.02	0.10
Chlorine,   Total	parts per million	249	0.03	<0.02	0.09
Chlorophyll-a	parts per billion	12	8.1	3.2	19.5
Colour,   Apparent	TCU	53	12.1	7.5	18.0
Colour, True	TCU	57	7.1	5.0	9.0
Conductivity	microsiemens   per centimetre	57	162	148	174
Langelier   Index (4 C)	units	4	-0.44	-0.56	-0.35
Langelier   Index (60 C)	units	4	0.33	0.21	0.42
Microcystin	parts per billion	12	<0.20	<0.20	<0.20
Odour	units	53	83	60	150
ORP	millivolts	53	504.2	442.6	559.6
Oxygen,   Dissolved	parts per million	53	11.1	7.2	14.1
pH	units	253	7.94	7.56	8.38
Plankton   (algae) count	cells/mL	12	19,897	6,103	53,800
Solids, Total	parts per million	53	109	93	151
Solids, Total   Dissolved	parts per million	57	90.06	57.2	112
Temperature	degrees Celcius	266	10.6	1.2	24.5
Turbidity   (clearness)	NTU	266	1.11	0.10	3.43
UV Absorbance,   Filtered	absorbance units	248	0.117	0.103	0.139
UV   Transmittance, Filtered	percent   transmissivity	248	76.3	72.6	78.9
UV   Transmittance, Unfiltered	percent   transmissivity	248	74.4	71.1	76.9
Anions and   Nutrients
Alkalinity,   Total	parts   per million as calcium carbonate	55	74.3	57.2	80.7
Alkalinity,   Bicarbonate	parts per million	4	75.8	70.0	78.7
Alkalinity,   Carbonate	parts per million	4	<1.0	<1.0	<1.0
Alkalinity,   Hydroxide	parts per million	4	<1.0	<1.0	<1.0
Hardness,   Total	parts   per million as calcium carbonate	57	80.3	72.7	88.6
Ammonia	parts per million	4	0.08	0.01	0.25
Bromide	parts per million	4	<0.050	<0.050	<0.050
Chloride	parts per million	55	1.8	1.2	2.1
Fluoride	parts per million	4	0.059	0.055	0.062
Nitrate   Nitrogen	parts per million	4	0.012	<0.0050	0.028
Nitrite	parts per million	4	<0.0010	<0.0010	0.0010
Perchlorate	parts per billion	4	<0.20	<0.20	<0.20
Phosphorus,Total	parts per million	4	<0.050	<0.050	<0.050
Sulphate	parts per million	55	<0.4	<0.4	0.8
Bacteria
Escherichia   Coli	MPN per 100 mL	67	34	<1	>200
Total   Coliforms	MPN per 100 mL	67	89	<1	>200
Heterotrophic   Plate Count	CFU per mL	52	159	11	>300
Disinfection   By-Products
Bromodichloromethane	parts per billion	12	<0.4	<0.4	<0.4
Haloacetic   acids	parts per billion	13	<1.2	<1.2	2.0
Trihalomethanes	parts per billion	12	<2.7	<2.7	<2.7
Enteric Protozoa
Cryptosporidium	oocysts per 100 L	13	<0.1	<0.1	<0.1
Giardia	cysts per 100 L	13	<0.1	<0.1	<0.1
Metals, Total
Aluminum	parts per million	56	0.00318	0.00071	0.02952
Antimony	parts per million	57	0.000058	<0.000025	0.000111
Arsenic	parts per million	57	0.000816	0.000374	0.001231
Barium	parts per million	4	0.0143	0.0133	0.0148
Beryllium	parts per million	4	<0.000020	<0.000020	<0.000020
Bismuth	parts per million	4	<0.000050	<0.000050	<0.000050
Boron	parts per million	57	0.01055	0.00777	0.01600
Cadmium	parts per million	57	<0.000005	<0.000005	<0.000007
Calcium	parts per million	57	20.657	17.395	24.098
Cesium	parts per million	4	<0.000010	<0.000010	<0.000010
Chromium	parts per million	55	0.000046	<0.000040	<0.00050
Chromium VI	parts per million	4	<0.00050	<0.00050	<0.00050
Cobalt	parts per million	4	<0.00010	<0.00010	<0.00010
Copper	parts per million	57	0.000658	0.000203	0.005370
Iron	parts per million	56	0.05681	0.02664	0.10203
Lead	parts per million	57	<0.000050	<0.000050	<0.000065
Lithium	parts per million	4	0.0022	0.0017	0.0024
Magnesium	parts per million	57	6.332	5.358	7.194
Manganese	parts per million	57	0.01339	0.00413	0.04891
Mercury	parts per million	4	<0.0000050	<0.0000050	<0.0000050
Molybdenum	parts per million	4	0.000152	0.000140	0.000164
Nickel	parts per million	54	0.000282	<0.000021	0.000851
Potassium	parts per million	57	1.202	0.969	1.421
Rubidium	parts per million	4	0.0017	0.0016	0.0019
Selenium	parts per million	4	0.000356	<0.000050	0.001290
Silicon	parts per million	4	1.97	1.50	2.45
Silver	parts per million	4	<0.000010	<0.000010	<0.000010
Sodium	parts per million	57	2.449	1.945	2.930
Strontium	parts per million	4	0.0380	0.0367	0.0398
Sulfur	parts per million	4	1.75	1.17	2.05
Tellurium	parts per million	4	<0.00020	<0.00020	<0.00020
Thallium	parts per million	4	<0.000010	<0.000010	<0.000010
Thorium	parts per million	4	<0.00010	<0.00010	<0.00010
Tin	parts per million	4	<0.00010	<0.00010	<0.00010
Titanium	parts per million	4	<0.00030	<0.00030	<0.00030
Tungsten	parts per million	4	<0.00010	<0.00010	<0.00010
Uranium	parts per million	57	0.000032	<0.000032	0.000072
Vanadium	parts per million	4	<0.00050	<0.00050	<0.00050
Zinc	parts per million	57	0.00057	<0.00011	0.00240
Zirconium	parts per million	4	<0.00020	<0.00020	<0.00020
Phenoxy Acid Herbicides
2,4,5-T	parts per billion	7	<0.50	<0.050	<0.50
2,4,5-TP	parts per billion	7	<0.50	<0.050	<0.50
2,4-D	parts per billion	7	<0.50	<0.050	<0.50
2,4-DB	parts per billion	7	<0.50	<0.050	<0.50
2,4-DP	parts per billion	7	<0.50	<0.050	<0.50
Asulam	parts per billion	7	<0.10	<0.010	<0.10
Brodifacoum	parts per billion	7	<0.10	<0.010	<0.10
Bromacil	parts per billion	7	<1.0	<0.10	<1.0
Bromoxynil	parts per billion	7	<0.50	<0.050	<0.50
Clopyralid	parts per billion	7	<1.0	<0.10	<1.0
Dicamba	parts per billion	7	<1.0	<0.10	<1.0
Diflufenican	parts per billion	7	<0.10	<0.010	<0.10
Dinoseb	parts per billion	7	<0.50	<0.050	<0.50
Linuron	parts per billion	7	<1.0	<0.10	<1.0
MCPA	parts per billion	7	<0.50	<0.050	<0.50
MCPB	parts per billion	7	<0.50	<0.050	<0.50
Mecoprop	parts per billion	7	<0.50	<0.050	<0.50
Nicarbazin	parts per billion	7	<0.10	<0.010	<0.10
Oryzalin	parts per billion	7	<0.50	<0.050	<0.50
Picloram	parts per billion	7	<1.0	<0.10	<1.0
Terbacil	parts per billion	7	<0.10	<0.010	<0.10
Polychlorinated   Biphenyls
Arochlor 1016	parts per billion	7	<0.020	<0.020	<0.020
Arochlor 1221	parts per billion	7	<0.020	<0.020	<0.020
Arochlor 1232	parts per billion	7	<0.020	<0.020	<0.020
Arochlor 1242	parts per billion	7	<0.020	<0.020	<0.020
Arochlor 1248	parts per billion	7	<0.020	<0.020	<0.020
Arochlor 1254	parts per billion	7	<0.020	<0.020	<0.020
Arochlor 1260	parts per billion	7	<0.020	<0.020	<0.020
Arochlor 1262	parts per billion	7	<0.020	<0.020	<0.020
Arochlor 1268	parts per billion	7	<0.020	<0.020	<0.020
Pesticides
Alachlor	parts per billion	6	<0.050	<0.050	<0.050
Aldicarb	parts per billion	6	<0.10	<0.10	<0.10
Aldrin	parts per billion	7	<0.0080	<0.0080	<0.0080
alpha-Chlordane	parts per billion	7	<0.0080	<0.0080	<0.0080
alpha-Endosulfan	parts per billion	7	<0.0070	<0.0070	<0.0070
alpha-HCH	parts per billion	7	<0.0080	<0.0080	<0.0080
Atrazine	parts per billion	6	<0.050	<0.050	<0.050
Azinphos-methyl	parts per billion	6	<0.10	<0.10	<0.10
Bendiocarb	parts per billion	7	<0.0250	<0.0250	<0.0250
beta-Endosulfan	parts per billion	7	<0.0070	<0.0070	<0.0070
beta-HCH	parts per billion	7	<0.0080	<0.0080	<0.0080
Carbaryl	parts per billion	6	<0.050	<0.050	<0.050
Carbofuran	parts per billion	6	<0.0250	<0.0250	<0.0250
Chlordane	parts per billion	7	<0.0110	<0.0110	<0.0110
Chlorothalonil	parts per billion	6	<0.050	<0.050	<0.050
Chlorpyrifos	parts per billion	6	<0.10	<0.10	<0.10
Cyanazine	parts per billion	6	<0.10	<0.10	<0.10
delta-HCH	parts per billion	7	<0.0080	<0.0080	<0.0080
Diazinon	parts per billion	6	<0.0250	<0.0250	<0.0250
Diclofop-methyl	parts per billion	6	<0.10	<0.10	<0.10
Dieldrin	parts per billion	7	<0.0080	<0.0080	<0.0080
Dimethoate	parts per billion	6	<0.050	<0.050	<0.050
Diuron	parts per billion	6	<0.050	<0.050	<0.050
Endosulfan	parts per billion	7	<0.010	<0.010	<0.010
Endosulfan   Sulfate	parts per billion	7	<0.0070	<0.0070	<0.0070
Endrin	parts per billion	7	<0.010	<0.010	<0.010
Endrin   Aldehyde	parts per billion	7	<0.010	<0.010	<0.010
Ethalfluralin	parts per billion	6	<0.10	<0.10	<0.10
EPTC (Eptam)	parts per billion	6	<0.50	<0.50	<0.50
gamma-Chlordane	parts per billion	7	<0.0080	<0.0080	<0.0080
gamma-HCH   (Lindane)	parts per billion	7	<0.0080	<0.0080	<0.0080
Heptachlor	parts per billion	7	<0.0080	<0.0080	<0.0080
Heptachlor   Epoxide	parts per billion	7	<0.0080	<0.0080	<0.0080
Hexachlorobutadiene	parts per billion	7	<0.0080	<0.0080	<0.0080
Hexachlorocyclohexane,   total	parts per billion	7	<0.0160	<0.0160	<0.0160
Hexachloroethane	parts per billion	7	<0.0080	<0.0080	<0.0080
Malathion	parts per billion	7	<0.0250	<0.0250	<0.0250
Methoxychlor	parts per billion	7	<0.0080	<0.0080	<0.0080
Methyl   Parathion	parts per billion	7	<0.10	<0.10	<0.10
Metolachlor	parts per billion	6	<0.0250	<0.0250	<0.0250
Metribuzin	parts per billion	6	<0.10	<0.10	<0.10
Metsulfuron-methyl	parts per billion	6	<0.050	<0.050	<0.050
Mirex	parts per billion	7	<0.0080	<0.0080	<0.0080
Omethoate	parts per billion	6	<0.050	<0.050	<0.050
Oxychlordane	parts per billion	7	<0.0080	<0.0080	<0.0080
o,p-DDD	parts per billion	7	<0.0040	<0.0040	<0.0040
o,p-DDE	parts per billion	7	<0.0040	<0.0040	<0.0040
o,p-DDT	parts per billion	7	<0.0040	<0.0040	<0.0040
p,p-DDD	parts per billion	7	<0.0040	<0.0040	<0.0040
p,p-DDE	parts per billion	7	<0.0040	<0.0040	<0.0040
p,p-DDT	parts per billion	7	<0.0040	<0.0040	<0.0040
Total-DDD	parts per billion	7	<0.0060	<0.0060	<0.0060
Total-DDE	parts per billion	7	<0.0060	<0.0060	<0.0060
Total-DDT	parts per billion	7	<0.0060	<0.0060	<0.0060
Parathion	parts per billion	6	<0.10	<0.10	<0.10
Pentachloronitrobenzene	parts per billion	7	<0.010	<0.010	<0.010
Phorate	parts per billion	6	<0.250	<0.250	<0.250
Propachlor	parts per billion	7	<0.0250	<0.0250	<0.0250
Propanil	parts per billion	7	<0.10	<0.010	<0.10
Propoxur	parts per billion	6	<0.0250	<0.0250	<0.0250
Simazine	parts per billion	6	<0.10	<0.10	<0.10
Terbufos	parts per billion	6	<0.50	<0.50	<0.50
Trans-Nonachlor	parts per billion	7	<0.010	<0.010	<0.010
Triallate	parts per billion	6	<0.10	<0.10	<0.10
Trichlopyr	parts per billion	7	<0.50	<0.050	<0.50
Trifluralin	parts per billion	6	<0.10	<0.10	<0.10
Taste and   Odours
Dichloromethane	parts per billion	3	<1.0	<1.0	<1.0
MTBE - methyl tertiary-butyl ether	parts per billion	3	<0.50	<0.50	<0.50
NDMA - N-nitrosodimethylamine	parts per billion	4	<0.034	<0.034	<0.034

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.