The EPA's national database for the drinking water program includes information on the nation's 170,000 public water systems and violations of drinking water regulations. Search for any water system in the country, by state.
Here you can find information such as the population served, reporting schedules (how often your water system needs to test for certain contaminants), lab results, and violations incurred.
This page contains information regarding the fluoride levels in your drinking water, search by state. This data is pulled from multiple sources and is updated yearly.