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Water and Wastewater

Sodium in Drinking Water

Sodium levels are regularly monitored in water supplied to Peel’s consumers. Samples collected are analyzed at accredited and licensed laboratories and test results are compiled and made available to the public.

Although it is not considered toxic to people, sodium in drinking water in excess of 20 mg/L may be significant to individuals with hypertension or cardiovascular diseases. The Medical Officer of Health is notified when the sodium concentration in a municipal water supply exceeds 20 mg/L so the information can be provided to local physicians.

Water supplied to Mississauga, Brampton, Town of Bolton and areas of Caledon (north of Mayfield) is drawn from Lake Ontario. The lake water is relatively low in sodium with seasonal fluctuations that are mainly contributed to snow meltdown and run-off conditions. Sodium levels in Peel's surface water supplies are unlikely to be a significant contribution to adverse health effects.

Water supplied to Caledon communities is groundwater which may have elevated sodium concentrations in some areas. Sodium found in groundwater sources is naturally occurring. Several communal wells in Caledon provide water with a sodium concentration above 20 mg/L. Other sources of elevated sodium in drinking water may be water softening as household water softeners turn naturally occurring calcium and magnesium (“hardness”) to soft salts, such as sodium.

The following is the summary of sodium test results for sampling completed during 2019.

Water System Sodium
Concentration
(mg/L)
Second Round 2019
(July to December)
Sodium
Concentration
(mg/L)
First Round 2020
(January to June)
Min Max Min Max

Alton

N/A

N/A

51

58

Caledon Village

12.0

34.0

13

37

Caledon East

7.8

82.0

8.3

86

Palgrave

7.4

7.9

7

9.8

Cheltenham

22.0

35.0

25

25

Inglewood

18.0

34.0

22

38

South Peel
(Mississauga, Brampton, South Caledon)

14.0

19.0

16

25

Note: Alton Well 3 was out of service from May - December 2019. During this period, water was supplied from the Caledon Village Water System.

Historic Sodium Levels

Revised: Wednesday July 15 2020

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