Mulroy served as general manager of the Southern Nevada Water Authority (SNWA) from 1993 until retiring in February 2014. She also served as the general manager of the Las Vegas Valley Water District from 1989 until her retirement.

Established in 1991, the Water Authority is responsible for acquiring, treating and delivering water to Southern Nevada.

Mulroy was a principal architect of the Authority, which allowed Southern Nevada to not only weather the stresses of growth, but also one of the worst droughts to befall the Colorado River.

As general manager of one of the country’s most progressive water agencies, Mulroy was exceptionally active in regional and national water issues.

She negotiated numerous agreements with her neighbors on the Colorado River, including international agreements with the country of Mexico. She also currently serves as treasurer of the Water Research Foundation Board of Trustees, is on the board of the National Water Resources Association and is a member of the American Water Works Association.

Additionally, she was the original chairperson of the Western Urban Water Coalition, is a former president of the Association of Metropolitan Water Agencies and has served on the Colorado River Water Users Association’s board of directors.

A resident of Southern Nevada for more than three decades, Mulroy is equally active in the community.

She currently chairs the University of Nevada, Las Vegas College of Sciences Advisory Board, and she has served on the Nevada Public Radio Board of Directors. Mulroy also is actively involved with the Diocese of Las Vegas and has served on the Board of Regents of Bishop Gorman High School.

Her honors include National Jewish Medical and Research Center’s Humanitarian Award, the University and Community College System of Nevada Board of Regents' Distinguished Nevadan Award, and the Education Hero Award from the Public Education Foundation.