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Posted on: May 31, 2019

Advisory to Sodium in Drinking Water

Dear Resident,

Every year, MassDEP requires all Public Water Suppliers to inform Health Departments when levels of sodium in the public drinking water supply exceed a certain level. Sodium is commonly found in drinking water, and it is a necessary mineral for the human body to function normally. We get sodium from nearly all the foods we eat, with higher concentrations coming from processed foods.

The MassDEP guideline for reporting sodium in drinking water to the Health Department is above 20 mg/L. The sodium level in Westford water has been measured at an average of 70.2 mg/L in the month of May in 2019. It is important to know that there is no State or Federal standard for mitigating sodium in drinking water.

The reason why this advisory is issued, is so that people with conditions such as hypertension, people with kidney failure, or people on a sodium restricted diet are made aware of sodium levels. Residents with sodium concerns in their diet should contact their health care provider.

Less than 10% of our sodium intake comes from drinking water, and almost all human intake is derived from foods we eat.  Sodium will affect the taste of water at 200mg/L. For more information about this advisory, you may call the Health Department at 978-692-5509 or call MassDEP at 617-624-5757. For further reading on sodium in drinking water, go to:


Jeffrey P. Stephens R.S., CP-FS

Health Director

Westford Health Department

55 Main St.

Westford, MA 01886


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