There are many possible contaminants of drinking water. The State of Oregon has strict guidelines that all public and community water systems must comply with. On the other hand, once a private well has passed the Domestic Well regulations upon sale of property there are no further laws and ordinances a well owner must follow. The following compounds are possible contaminants of private wells with a description of health, safety, and aesthetic concerns. Click on each compound name to download pdf-format health information materials provided by the State of Oregon.