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See national section for basic information and federal regulations.
Comparison: State vs. Federal
• Rules. Delaware has adopted many of the federal requirements for the protection of public water supplies under the Safe Drinking Water Act (SDWA) and has some additional, more stringent requirements. For example, the state has stricter maximum contaminant levels (MCLs) for certain pollutants, such as turbidity and radium.
In addition, the state has a primary MCL for nickel of 0.1 milligrams per liter (mg/L), where there is no federal primary MCL for nickel. See the national section DRINKING WATER for additional information on the federal MCLs and the SDWA.
Delaware has also adopted regulations for licensing and registration of operators of public water supply systems.
• Administration and enforcement. The Division of Public Health's (DPH) Office of Drinking Water has primary responsibility for ...