Conductivity is the measure of the conductance of the water to an electric current. This is an easy measurement to make and relates closely to the total dissolved solids content of the water. Some water supplies in North Dakota contain naturally occurring fluoride in amounts high enough to cause mottling of the teeth. A metallic taste may also be present and it may affect the taste of beverages made from the water. High concentrations of iron and manganese do not appear to present a health hazard.
Adults can drink water with considerably higher concentrations than infants without adverse affects.
The pH of water indicates whether the water is acid or alkaline. The measurement of pH ranges from 1 to 14 with a pH of 7 indicating a neutral solution, neither acid nor alkaline. Drinking water with a pH of between 6.5 and 8.5 is generally considered satisfactory. Acid waters tend to be corrosive to plumbing and faucets, particularly if the pH is below 6. Alkaline waters are less corrosive.