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The Acton Water District conducts annual sampling for sodium at all wells or water treatment plants (WTPs) that are in operation.  The most recent results for treated water entering our distribution system are listed in the table below.

Date  Source  Concentration (mg/L)
05/09/2023 Central Acton WTP 65.8
04/26/2023 North Acton WTP 45.6
04/26/2023 South Acton WTP 61.3

Although sodium does not have a maximum contaminant level, the Massachusetts Department of Environmental Protection has a guideline of 20 milligrams per liter (mg/L) for sensitive individuals, such as those on very salt-restricted diets.  Sodium levels in drinking water vary considerably from well to well and month to month.  For the most accurate data on sodium levels at your home, an individual tap sample would be necessary.