The Safe Drinking Water Act, 2002 Regulation 170/03 requires operators of drinking water systems to report sodium levels above 20mg per litre to the local Medical Officer of Health because of the potential risk to public health.
Sodium is an essential dietary element: however for some individuals who suffer from hypertension, chronic kidney disease or congestive heart failure, restricting the daily intake of sodium is essential in managing their condition. The sodium intake from drinking water may be significant for these individuals. Using bottled water as an alternative drinking water source may be appropriate; however the label should be checked for the sodium concentration to ensure it is below 20mg/l.
The following municipal water systems have sodium levels above 20mg/l.
Name of System: Municipality of Mississippi Mills Drinking Water System
Date of Most Recent Sample: July 2018
First Results: Well 3: 47.5mg/l, well 5: 66.7mg/l, wells 7 and 8: 43.8mg/l.
Second Results: Well 3: 42.8mg/l, well 5: 63.8mg/l, wells 7 and 8: 42.1mg/l.
Comments: 5 wells combined
Name of System: North Grenville Drinking Water System
Date of Most Recent Sample: January 2017
Result: 31.2mg/l, 31.9mg/l, 44.8mg/l, 47.6mg/l
Comments: 4 sampling sites
Name of System: Drinking Water System Lansdowne is owned by the Township of Leeds and the Thousand Islands and operated by the Ontario Clean Water Agency
Date of Most Recent Sample: February 2017
Name of System: Merrickville-Wolford Drinking Water System
Date of Most Recent Sample: January 2016
Name of System: Village of Westport Drinking Water System
Date of Most Recent Sample: January 2018