Concept:'Har Ghar Jal' certification is awarded to states or union territories that provide tap water connections to every rural household.Explanation:Goa achieved 100% coverage of rural households with functional tap water connections.Therefore, Goa became the first 'Har Ghar Jal' certified state in India.Dadra and Nagar Haveli and Daman and Diu became the first certified Union Territory.Answer:Option A: Goa