Town Hall Address 1 Elizabeth Street Derby, CT 06418 United States- New Haven County Website http://www.electronicvalley.org/derby Town Clerk 203-736-1462 United States Tax Collector 203-736-1459 United States Assessor 203-736-1455 http://derby.mapxpress.net/ United States Building 203-736-1481 United States Zoning 203-736-1481 United States Water 860-735-1888 United States Sewer 203-736-1465 United States Probate Court Derby (PD-41) Tax Adjustment Uniform Fiscal Year- July, January Indices General Index (from 1974 to present on computer) - real property - town taxes - sewer use - real estate images from 1995 to present Town Hall Hours M, Tues., Wed – 8:30 to 5:00, Thurs 8:30 to 6:00, Fri 8:30 to 12:30 Water Source South Central Water Authority, Also well and septic Sewer Source WPCA County New Haven