COVID-19 Community Levels Map Update, August 5, 2022: The Centers for Disease Control and Prevention has listed New Haven, Fairfield, Litchfield and Middlesex Counties in the Medium/Yellow category as part of its COVID-19 Community Levels Map. Hartford, New London, Tolland and Windham Counties are listed in the Low/Green category. Visit the CDC COVID-19 Community Levels Map for updates.


Monkeypox: Please visit our monkeypox webpage for the latest updates.

Sodium & Chloride

Sodium and chloride are very common in nature and can occur naturally at low levels in ground water. Sources such as road salt, fertilizers, sewage, water softener discharge and salt water intrusion in coastal environments can increase ground water concentrations significantly. The Maximum Contaminant Level (MCL) for chloride in Connecticut water supplies is 250 milligrams per liter (mg/L) and the notification level for sodium is 28 mg/L. While the chloride MCL is not health based, chloride is typically found with elevated sodium levels. Elevated levels of sodium, coupled with dietary intake, can potentially affect those on a sodium-restricted diet. Additionally, elevated levels of chloride and sodium can increase the corrosivity of the drinking water supply and may affect building plumbing.

The Department of Public Health and the Connecticut Environmental Health Association have established a sodium chloride stakeholder workgroup to help identify and address the increasing presence of these contaminants in drinking water statewide.

Sodium Chloride Stakeholder Workgroup Meeting

June 11, 2019 from 9:00 a.m. to 3:00 p.m
Connecticut Department of Public Health Laboratory
395 West Street, Rocky Hill, Connecticut
Save the Date