Lolo could see dramatic growth over the next two and a half decades, but that growth hinges on whether the community's water and sewer system can keep up.According to an impact study, done for Missoula County by HDR Engineering Inc., Lolo could see up to 5,400 more dwelling units by 2050.Missoula County is currently drawing up plans to expand the sewer, with a Rural Special Improvement District being established. The special district essentially…