MWI was originally founded as an iron and steel equipment manufacturer in 1926. After the 1928 hurricane that hit Florida, MWI became involved in providing pumping stations for irrigation, drainage and flood control applications. Today, MWI provides water pump rentals with products designed and manufactured in the United States, including its Hydraflo, Duraflo, PrimeRite, Rotoflo, and Silent Partner pumps.

Rain for Rent was founded in 1934 as an oilfield supplies business; today, it provides full-service liquid handling solutions in the United States and Canada from more than 60 locations. Its water pump rentals are ideal for both municipal and industrial applications, including flood relief, construction site dewatering, sewer bypass, and industrial plant turnarounds.