lease review the question and my response. If I'm missing core information (Micro-econ) please tell me what it is and briefly explain.

In recent years, Detroit shut off water to some city residents because of unpaid bills. Those opposed to these shut offs, including the United Nations, claim that city tap water is a public good. Evaluate this claim.

In economics, a public good is a good that is both non-excludable and non-rivalrous in that individuals cannot be effectively excluded from use and where use by one individual does not reduce availability to others. Although we may all consider water as something people have a right to the definition of a public good explicitly states that the good in question cannot be effectively excluded from use. However, waterlines are controlled by water companies and governments who can effectively monitor the people who use it and effectively exclude the people who do not or cannot afford the “service” provided. Technically by definition use of water systems cannot be considered a public good.