The most common contaminants found in household water in Montgomery County were sodium, hardness, total coliform bacteria, and iron.
Hardness is composed of calcium and magnesium, which originates in bedrock such as limestone.
Sodium concentrations above recommended levels are most likely the result of water softeners, used to remove hardness. Sodium can have negative health effects in excess levels.
Total coliform bacteria presence is an indication that surface water may be entering a well and other more harmful microorganisms may be present. Total coliform was found in 26% of the Montgomery County samples.
Iron is considered a nuisance contaminant and can cause staining and a metallic taste. It was found in 8% of samples, which were exceeding 0.3 mg/L.