Blue-green stains on your sink or porcelain fixtures can indicate that the water contains copper. In most cases this would indicate that your water is corrosive and is reacting with your household plumbing by leaching the metal out of your water lines or fixtures. Water from a public system, like the City of Gig Harbor or water from a well that has passed water quality testing is safe to drink. If you have your own well, testing for bacteria once a year and for nitrate every three years will help ensure your water is safe to drink. Public water systems are required implement more rigorous testing.
Bottled water is useful as an alternative to soft drinks when thirsty.