DOTHAN, Al. (WTVY) Work is underway as construction continues on the Omussee treatment plant on the east side of Dothan. The Omussee treatment plant is the second of three to get an upgrade,the first being the little Choctawhatchee treatment plant in 2011. The job costs around $39.2 and is approximately 30% complete. The average amount of water the site sees is around three-million gallons a day during dry periods. One of the jobs the upgrade will do is help with treatment of storm water when severe weather events happen.