2024 Water Treatment Plant treated water quality test results

The 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. 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.

Testing

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 December 31, 2024

What is being measured	How it's measured	Guideline or regulation	Water Treatment Plant treated average	Water Treatment Plant treated range
Miscellaneous
Carbon,   Dissolved Organic	parts per million	no guideline	3.3	2.5	4.3
Carbon, Total   Organic	parts per million	no guideline	2.8	1.4	6.0
Chlorine, Free	parts per million	no   guideline	1.44	0.93	2.03
Chlorine,   Total	parts per million	no guideline	1.66	1.20	2.40
Chlorophyll-a	parts per billion	no guideline	<1.0	<1.0	<1.0
Colour,  Apparent	TCU	no guideline	0.7	0.0	2.5
Colour, True	TCU	no more than 15 *	0.0	0.0	0.0
Conductivity	microsiemens   per centimetre	no guideline	292	270	313
Microcystin	parts per billion	no more than 1.5	<0.2	<0.2	<0.2
Odour	units	inoffensive*	15	8	25
ORP	millivolts	no guideline	604.2	512.1	675.1
Oxygen,   Dissolved	parts per million	no guideline	11.6	8.7	16.0
pH	units	between 7.0 and 10.5	7.76	7.23	7.99
Plankton   (algae) count	cells/mL	no guideline	<100	<100	<100
Solids, Total	parts per million	no guideline	182	151	201
Solids, Total   Dissolved	parts per million	no more than 500 *	160	101	186
Temperature	degrees Celcius	no more than 15 *	11.0	1.1	24.4
Turbidity   (clearness)	NTU	no   more than 0.3 in 95% of measurements/month,      never to exceed 1.0	0.11	0.06	0.70
UV Absorbance,   Filtered	absorbance units	no guideline	0.023	0.008	0.034
UV   Transmittance, Filtered	percent   transmissivity	no guideline	94.8	92.5	98.2
UV   Transmittance, Unfiltered	percent   transmissivity	no guideline	93.6	81.7	96.8
Anions and   Nutrients
Alkalinity,   Total	parts   per million as calcium carbonate	no guideline	67.5	61.1	74.3
Hardness,   Total	parts   per million as calcium carbonate	no guideline	80.4	73.3	94.3
Chloride	parts per million	no more than 250 *	3.8	3.3	5.1
Perchlorate	parts per billion	no guideline	<0.20	<0.20	<0.20
Sulphate	parts per million	no more than 500 *	65.0	50.4	78.5
Bacteria
Escherichia   Coli	MPN per 100 mL	none   detectable per 100 mL	<1	<1	<1
Total   Coliforms	MPN per 100 mL	none   detectable per 100 mL	<1	<1	<1
Heterotrophic   Plate Count	CFU per mL	no guideline	<1	<1	2
Disinfection   By-Products
BDCM	parts per billion	no guideline	1.7	0.9	2.7
Haloacetic   acids	parts per billion	no more than 80	13.2	5.6	16.6
Trihalomethanes	parts per billion	no more than 100	14.81	7.40	18.30
Metals, Total
Aluminum	parts per million	no more than 2.9	0.00536	0.00162	0.02940
Antimony	parts per million	no more than 0.006	0.000057	<0.000025	0.000261
Arsenic	parts per million	no more than 0.010	0.000356	0.000255	0.000482
Boron	parts per million	no more than 5	0.01064	0.00825	0.01302
Cadmium	parts per million	no more than 0.007	<0.000007	<0.000007	0.000013
Calcium	parts per million	no guideline	20.996	18.244	24.143
Chromium	parts per million	no more than 0.05	0.00005	<0.00004	0.00017
Chromium VI	parts per million	no guideline	<0.00050	<0.00050	<0.00050
Copper	parts per million	no more than 2.0	0.000777	0.000116	0.004292
Iron	parts per million	no more than 0.1 *	0.06088	0.01310	0.10224
Lead	parts per million	no more than 0.005	<0.000065	<0.000065	<0.000065
Magnesium	parts per million	no guideline	6.438	5.614	7.573
Manganese	parts per million	no more than 0.12	0.01193	0.00755	0.02463
Mercury	parts per million	no more than 0.001	<0.0000050	<0.0000050	<0.0000050
Nickel	parts per million	no guideline	0.003155	0.002438	0.004048
Potassium	parts per million	no guideline	1.219	1.031	1.482
Sodium	parts per million	no more than 200 *	29.626	25.481	34.865
Uranium	parts per million	no more than 0.02	0.000034	<0.000032	0.000131
Zinc	parts per million	no more than 5.0 *	0.00062	0.00013	0.00314
Phenoxy Acid Herbicides
2,4,5-T	parts per billion	no guideline	<0.50	<0.050	<0.50
2,4,5-TP	parts per billion	no guideline	<0.50	<0.050	<0.50
2,4-D	parts per billion	no more than 100	<0.50	<0.050	<0.50
2,4-DB	parts per billion	no guideline	<0.50	<0.050	<0.50
2,4-DP	parts per billion	no guideline	<0.50	<0.050	<0.50
Asulam	parts per billion	no guideline	<0.10	<0.010	<0.10
Brodifacoum	parts per billion	no guideline	<0.10	<0.010	<0.10
Bromacil	parts per billion	no guideline	<1.0	<0.10	<1.0
Bromoxynil	parts per billion	no more than 30	<0.50	<0.050	<0.50
Clopyralid	parts per billion	no guideline	<1.0	<0.10	<1.0
Dicamba	parts per billion	no more than 110	<1.0	<0.10	<1.0
Diflufenican	parts per billion	no guideline	<0.10	<0.010	<0.10
Dinoseb	parts per billion	no guideline	<0.50	<0.050	<0.50
Linuron	parts per billion	no guideline	<1.0	<0.10	<1.0
MCPA	parts per billion	no more than 350	<0.50	<0.050	<0.50
MCPB	parts per billion	no guideline	<0.50	<0.050	<0.50
Mecoprop	parts per billion	no guideline	<0.50	<0.050	<0.50
Nicarbazin	parts per billion	no guideline	<0.10	<0.010	<0.10
Oryzalin	parts per billion	no guideline	<0.50	<0.050	<0.50
Picloram	parts per billion	no guideline	<1.0	<0.10	<1.0
Terbacil	parts per billion	no guideline	<0.10	<0.010	<0.10
Polychlorinated   Biphenyls
Arochlor 1016	parts per billion	no guideline	<0.020	<0.020	<0.020
Arochlor 1221	parts per billion	no guideline	<0.020	<0.020	<0.020
Arochlor 1232	parts per billion	no guideline	<0.020	<0.020	<0.020
Arochlor 1242	parts per billion	no guideline	<0.020	<0.020	<0.020
Arochlor 1248	parts per billion	no guideline	<0.020	<0.020	<0.020
Arochlor 1254	parts per billion	no guideline	<0.020	<0.020	<0.020
Arochlor 1260	parts per billion	no guideline	<0.020	<0.020	<0.020
Arochlor 1262	parts per billion	no guideline	<0.020	<0.020	<0.020
Arochlor 1268	parts per billion	no guideline	<0.020	<0.020	<0.020
Pesticides
Alachlor	parts per billion	no guideline	<0.050	<0.050	<0.050
Aldicarb	parts per billion	no guideline	<0.10	<0.10	<0.10
Aldrin	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
alpha-Chlordane	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
alpha-Endosulfan	parts per billion	no guideline	<0.0070	<0.0070	<0.0070
alpha-HCH	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Atrazine	parts per billion	no more than 5	<0.050	<0.050	<0.050
Azinphos-methyl	parts per billion	no guideline	<0.10	<0.10	<0.10
Bendiocarb	parts per billion	no guideline	<0.0250	<0.0250	<0.0250
beta-Endosulfan	parts per billion	no guideline	<0.0070	<0.0070	<0.0070
beta-HCH	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Carbaryl	parts per billion	no guideline	<0.050	<0.050	<0.050
Carbofuran	parts per billion	no guideline	<0.0250	<0.0250	<0.0250
Chlordane	parts per billion	no guideline	<0.0110	<0.0110	<0.0110
Chlorothalonil	parts per billion	no guideline	<0.050	<0.050	<0.050
Chlorpyrifos	parts per billion	no more than 90	<0.10	<0.10	<0.10
Cyanazine	parts per billion	no guideline	<0.10	<0.10	<0.10
delta-HCH	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Diazinon	parts per billion	no guideline	<0.0250	<0.0250	<0.1250
Diclofop-methyl	parts per billion	no guideline	<0.10	<0.10	<0.10
Dieldrin	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Dimethoate	parts per billion	no more than 20	<0.050	<0.050	<0.050
Diuron	parts per billion	no guideline	<0.050	<0.050	<0.050
Endosulfan	parts per billion	no guideline	<0.010	<0.010	<0.010
Endosulfan   Sulfate	parts per billion	no guideline	<0.0070	<0.0070	<0.0070
Endrin	parts per billion	no guideline	<0.010	<0.010	<0.010
Endrin   Aldehyde	parts per billion	no guideline	<0.010	<0.010	<0.010
Ethalfluralin	parts per billion	no guideline	<0.10	<0.10	<0.10
EPTC (Eptam)	parts per billion	no guideline	<0.50	<0.50	<0.50
gamma-Chlordane	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
gamma-HCH   (Lindane)	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Heptachlor	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Heptachlor   Epoxide	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Hexachlorobenzene	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Hexachlorobutadiene	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Hexachlorocyclohexane,   total	parts per billion	no guideline	<0.0160	<0.0160	<0.0160
Hexachloroethane	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Malathion	parts per billion	no more than 290	<0.0250	<0.0250	<0.0250
Methoxychlor	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Methyl   Parathion	parts per billion	no guideline	<0.10	<0.10	<0.10
Metolachlor	parts per billion	no guideline	<0.0250	<0.0250	<0.0250
Metribuzin	parts per billion	no more than 80	<0.10	<0.10	<0.10
Metsulfuron-methyl	parts per billion	no guideline	<0.050	<0.050	<0.050
Mirex	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
Omethoate	parts per billion	no more than 20	<0.050	<0.050	<0.050
Oxychlordane	parts per billion	no guideline	<0.0080	<0.0080	<0.0080
o,p-DDD	parts per billion	no guideline	<0.0040	<0.0040	<0.0040
o,p-DDE	parts per billion	no guideline	<0.0040	<0.0040	<0.0040
o,p-DDT	parts per billion	no guideline	<0.0040	<0.0040	<0.0040
p,p-DDD	parts per billion	no guideline	<0.0040	<0.0040	<0.0040
p,p-DDE	parts per billion	no guideline	<0.0040	<0.0040	<0.0040
p,p-DDT	parts per billion	no guideline	<0.0040	<0.0040	<0.0040
Total-DDD	parts per billion	no guideline	<0.0060	<0.0060	<0.0060
Total-DDE	parts per billion	no guideline	<0.0060	<0.0060	<0.0060
Total-DDT	parts per billion	no guideline	<0.0060	<0.0060	<0.0060
Parathion	parts per billion	no guideline	<0.10	<0.10	<0.10
Pentachloronitrobenzene	parts per billion	no guideline	<0.010	<0.010	<0.010
Phorate	parts per billion	no guideline	<0.250	<0.250	<0.250
Propaclor	parts per billion	no guideline	<0.0250	<0.0250	<0.0250
Propanil	parts per billion	no guideline	<0.10	<0.010	<0.10
Propoxur	parts per billion	no guideline	<0.0250	<0.0250	<0.0250
Simazine	parts per billion	no guideline	<0.10	<0.10	<0.10
Terbufos	parts per billion	no guideline	<0.50	<0.50	<0.50
Trans-Nonachlor	parts per billion	no guideline	<0.010	<0.010	<0.010
Triallate	parts per billion	no guideline	<0.10	<0.10	<0.10
Trichlopyr	parts per billion	no guideline	<0.50	<0.050	<0.50
Trifluralin	parts per billion	no guideline	<0.10	<0.10	<0.10
Taste and Odours
Dichloromethane	parts per billion	no more than 50	<1.0	<1.0	<1.0
MTBE - methyl tertiary-butyl ether	parts per billion	no more than 15 *	<0.50	<0.50	<0.50
NDMA   -N-nitrosodimethylamine	parts per billion	no more than 0.04	<0.034	<0.034	<0.034

* Aesthetic objective: These guidelines have an   objective and not a maximum acceptable concentration. 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, March 2025

Results   in red do not meet the guideline

Note: Where value is expressed as less than   (<), the value is halved and used in the calculations,
                where value is expressed   as (>), the value is used in the calculations.

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