I have a civic issue (e.g. broken street light, water supply, road) and I am not sure who to contact — local panchayat, municipality, State department, or Centre. Who should we contact for this civic issue?

Quick answer: Local issues (water, roads, street lights, sanitation in your area) are usually with the panchayat (village) or municipality (town/city). Contact your ward councillor or panchayat office first. For State schemes or departments, use your State grievance portal. For Central schemes, use CPGRAMS. Our doc on Understanding Local Government Roles and How to Raise a Public Issue has more.