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The web service is publicly available to promote the protection of public drinking water sources. Local governments and State agencies are encouraged to use this data when reviewing permits of activities that may affect a public drinking water source.\nThe DWPAs can also be used to help determine sampling/monitoring requirements for public water systems. This data is dynamic and is regularly updated. For further information on Source Water Assessment Report is available here: http://dec.alaska.gov/eh/dw/dwp/source_water.html\nDWPAs are divided up into Zones A, B, C, E, F and G. The definition of the Zones depends on the source type e.g. ground water, surface water or ground water under direct influence of surface water. Note: the use of Zone D (10 year Time of Travel) has been discontinued. \n\nZone A: Ground Water sources- equivalent to several months\u2019 Time of Travel, as defined in the Source Water Assessment. 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