Town Hall Address 815 Riverside Drive (Route 12), P. O. Box 899 North Grosvenordale, CT 06255 United States- Windham County Website http://www.thompsonct.org Town Clerk 860-923-9900 https://www.uslandrecords.com/ctlr/ United States Tax Collector 860-923-2119 Mon-Wed – 9:00-4:00, Thurs – 9:00-6:00, Fri – 9:00-2:00 United States Assessor 860-923-2259 http://gis.vgsi.com/thompsonct/ Mon-Wed – 9:00-4:00, Thurs – 9:00-6:00, Fri – 9:00-2:00, United States Building 860-923-9002 Mon-Thurs – 7:00-3:00 United States Zoning 860-923-9475 Mon, Wed & Fri – 9:00-2:00 United States Water 860-774-8889 United States Sewer 860-928-2300 United States Probate Court Northeast (PD-26) Tax Adjustment Uniform Fiscal Year- July, January Indices General Index > real property > town taxes > sewer assessment > sewer use Town Hall Hours Monday to Wednesday – 9:00 to 4:00 Thursday 9:00 to 6:00 Friday 9:00 to 2:00, 1st Saturday of each month: 9:00 to Noon Water Source Connecticut Water Service Sewer Source WPCA County Windham