In school water fluoridation programme, the level of fluoride as compared to the level in community water fluoridation is:

The amount of fluoride added to school drinking water must be greater than that used in communal water supplies, i.e., 4.5 times the optimum concentration, since children are in school for shorter hours and less water is consumed during that time. Essentials of preventive and community dentistry Soben Peter 5th edition page number 226