Chlorides – bad taste & odor – generally combines with calcium, magnesium, or sodium to form various salts. For ex: sodium chloride (NaCl) –  most common anions found in tap water – occurs naturally in groundwater –  found in greater concentrations where seawater & run-off from road salts (salts used to de-ice icy roads) can make their way into water sources

Harmful Effects

• Damage plants if used for gardening or irrigation
• Gives drinking water an unpleasant taste
• High corrosivity overtime will damage plumbing, appliances, & water heaters  
• Leaching toxic metals
• Complicate existing heart problems
• Contribute to high blood pressure when ingested in excess