Aquarion Water Company has started installation on a new water line in Newtown.  The water main extension project on Riverside Road started last week and the work is expected to last throughout October.   Work is being done between 7am and 5pm.  Aquarion is giving property owners in the work zone the    opportunity to hook into the water line, but the decision on whether or not to connect must be made within about a year.  Newtown pushed off road repaving on Riverside from this summer to next in order to accommodate the project.  Newtown will receive $220,000 from Aquarion to help pay for repaving after the water line installation is completed, a percentage of the total cost.  After the town paves, only emergencies such as well failure or a requirement to connect from the health department will be accommodated.  Aquarion is also planning a water main replacement project on Alpine Drive later this year.