what causes water to become bitter
Excessively high and low pHs can be detrimental for the use of water. High pH causes a bitter taste, water pipes and water-using appliances become encrusted with deposits, and it depresses the effectiveness of the disinfection of chlorine, thereby causing the need for additional chlorine when pH is high.
Bitter Taste. Usually when you have a bitter taste, your pH level is off. When the pH level is higher than normal it is considered hard water, and can cause a bitter taste in your water (or coffee and tea). Depending on the pH level, this can present health risks, so you should have your water tested.