Kathryn "Kitty" Hach-Darrow (October 20, 1922 – June 4, 2020) was an American businesswoman and philanthropist who co-founded the Hach Chemical Company in 1947 with her first husband Clifford C. Hach (pronounced hɑ:k). She was essential to the company's expansion, flying her own plane to small airfields across the country to sell water purification kits. She became president, chief operating officer, and CEO of the Hach company. Kathryn Hach-Darrow was also the first woman director of the American Water Works Association, an international non-profit working for better water quality. She has been noted for philanthropic work as well as her entrepreneurial success, and has received a number of awards and honors as a result of her contributions to both business and chemistry. Early life and education Kathryn Carter was born in Bucklin, Missouri, where her father was an automobile dealer. He was also a pilot, flying his own Eagle Rock biplane. Kitty's first ride in an airplane occurred at the age of 5, the beginning of her lifelong love of flying. Her mother was a schoolteacher. The Great Depression was financially disastrous for the Carter family. Her father did not go bankrupt, but lost his business and his plane. The family bought a farm in Triplett, Missouri and lived there during Kathryn's teens. Kathryn did well in school and earned money for college by raising and selling turkeys. She initially attended Columbia College, Missouri (then named Christian Female College), before transferring to Iowa State University to study home economics. At Iowa State University, Kitty met Nellie May Naylor, a chemist in the home economics department who interested her in chemistry. Marriage and work Kathryn and her first husband Clifford C. Hach met as students at Iowa State University, and married in 1943. "I knew right away that this guy was going to build a chemical company," she says. "He didn't care how big Dow was or how big DuPont was, he was going to build his own company." Clifford did not receive his bachelor's degree until 1947, because he and other students were co-opted to work on war-time projects at the university. It was difficult to find jobs after graduation. Eventually, Clifford was hired part-time by a filtration company in Ames, Iowa to analyze water. Seeing how the water-treatment plant worked gave Clifford the idea for a process and a product: a simplified method of analysis that would enable workers