pH Water Quality

What is pH?
The pH of a liquid reflects its concentration of hydrogen ions. The lower the pH, the higher the concentration and the more acidic, and the higher the pH the more alkaline. Typically all natural waters fall within the level of 6.0 to 8.0 pH. A value of 7.0 is considered to be a neutral pH; this is usually the pH of distilled water. The pH scale ranges between 0 and 14, as reflected in this scale:

You can test your water's pH using pH Test Strips.
Causes & Negative Effects
Alkaline Water occurs naturally when water passes over rocks and picks up minerals, increasing it's alkaline levels. Some companies sell ionizers, which they claim are able to increase alkalinity through electrolysis. Some people believe drinking mineral water has health benefits, however water that is too alkaline can cause digestive discomfort. 

Acidic Water can occur due to airborne pollutants, soil composition, coal mine drainage, chemical dumping, plant decomposation, local flooding and other natural disasters, and is a problem most often faced by well owners. Acidic water can cause corrosion in pipe fixtures. It can also cause toxic metals such as lead, copper, zinc, iron, and manganese to leach into your water from your pipes, leading to a number of health concerns.