Acidic water (low pH) is common near mountainous areas due to a lack of limestone in the ground. Acidic water eats through copper, faucets, and appliances. The most common symptom is blue-green stains near the drains of your sinks and tubs. Acidic water can also cause leaking faucets and water heaters. Acid Neutralizers are usually the most economical way to get great water filtration and a balanced pH.