This level is based on aesthetic concerns and is only advisory in the EPA Safe Drinking Water Act program. The following are the most common sources of salt in water supplies. Application of road deicing salts. Road salt runoff can contaminant groundwater. If a well is contaminated by de-icing salts and the origin is suspected to be from a state highway, the New Hampshire Department of Transportation, Bureau of Highway Maintenance, may help correct the situation.
Water softeners add sodium to drinking water in two ways.
The amount of salt added by a water softener can be substantial if a water's hardness is high. The volume of waste brine generated in the regeneration cycle can be reduced by using water meters or ion probes to trigger regeneration. This is called demand regeneration. Many water treatment chemicals have sodium as a basic ingredient. These chemicals often perform a valued treatment function.