pH measures of the hydrogen ion concentration in water. A pH of 7 is neutral.  Values above 7 are alkaline or basic and those below 7 are acidic.  Acidic water often is corrosive. Iron also may be a problem in acidic water.

Acceptable results:  There is no health standard.  Values from 7.5 to 8.3 are ideal.

Sources:  Low values often are caused by lack of carbonate minerals from limestone and minerals in the aquifer. Some contaminated sources like landfills may lower the pH.

Recommended testing: Annually