Compliance is based on a running annual average.
Testing for arsenic, barium, nickel, sodium and gross alpha is required every three years in accordance with the State's monitoring framework. 90th percentile value reported. Fluoride testing to demonstrate compliance with State regulations is required every three in accordance with the State's monitoring framework. Fluoride levels are monitored daily for the Main system treatment plants where fluoride is added to promote strong teeth. Effective date for compliance is December 2003.