Dick Asbell, who is a member of IRWA, took two gallons of water to the conference to take part in the blind taste test.
"I've always thought Greencastle water was great," Asbell said.
The water was tested by chemists and others who can not only judge what water tastes best, but also know what about its chemical content makes it taste good or bad.
"These guys are sitting around drinking this water like a wine tasting," he said. "On the last day, they announced the winner, and it was us. These people that deal in water voted Greencastle the best water."
The framed certificate Asbell received says, in part, "In judging by it peers, Big Walnut Water was found to have the best tasting water in the Water Taste Contest held during the Indiana Rural Water Association's 2009 Spring Conference."
Asbell was most impressed that Greencastle's water stood out at this conference, which was attended by people from all over the state.
"Here's little Greencastle, and there's water systems that have 15,000 customers on them," Asbell said.
By contrast, Asbell has his distribution license for Big Walnut Water Company, which distributes water to about 200 rural customers in the area.
For her part, Greencastle Mayor Sue Murray was also proud of the credit this gives to the city and its employees.
"This is most definitely a wonderful award to celebrate and once again underscores that our small town is pretty special," Murray said.