After seventy-five years of culinary water having to be dipped from irrigation ditches, a water system was installed. In 1913 the first telephone was installed; in 1923 a gymnasium was added to the school. In 1931 electricity was available; in 1938 Washington had its first street lighting. State highway 91 linked Washington with the rest of the state, and later Interstate 15 was constructed through Washington.

Washington began to experience the population boom the whole county enjoyed beginning in the 1960s. A new elementary school was built in 1976, with additions in 1978 and 1980. Junior high and high school students attend schools located in St. George. By 1983 the city had added a city hall, a park, swimming pool; the cemetery also had been improved. In 1985 the cotton factory was restored by Norma Cannizzaro for public use. The city bonded $4.1 million for the 18-hole Green Springs golf course in 1988.