Tap water fluoride levels in Estonia

The fluoride content of local tap water was assessed throughout Estonia, including all water supplies serving at least 100 inhabitants. The distribution of water fluoride levels was found to vary significantly both between counties and within them. High and low fluoride waters from different aquifers are sometimes present in the same location. Fluoride ion levels ranging from 0.01 to 6.95 mg/L (mean 0.88 +/- 0.90 mg/L) are divided into 8 concentration ranges and presented at the county level in order to allow linkage to epidemiological studies, health risk assessment, and remediation actions.