False! In most cases municipal water systems are treated, but they are treated for things in water that the EPA deems health hazards, such as: bacteria, arsenic and lead. Municipal systems are not required to treat for “nuisance” contaminants like hardness, iron, and manganese. Municipal systems usually add chlorine to the water, and over chlorination is a possibility.
Because municipalities do not have to treat for nuisance contaminants, that leaves you and your home susceptible to staining, hardness build up and water that smells like chlorine. Hardness and mineral build up is aesthetically unpleasing and, can shorten the life of your water using appliances.
Using home water treatment on a municipal supply is an excellent idea and a great way to protect two of your biggest investments, your home and your family.
https://www.cdc.gov/healthywater/drinking/public/water_treatment.html – This link shows what process municipal water treatment usually looks like and also discusses what household treatment may look like after the water has been treated by the municipality.
Debunking Myths – Part 3 of 5;