Tiffin City Engineer Curtis Eagle will retire May 31 after 19 years with the city.
Eagle said he does not have any plans at the moment, and he plans to take the summer off.
He said the sewer expansion project was his biggest accomplishment as engineer.
"When I first came here there was going to be an EPA moratorium, not allowing any new building in Tiffin because the sewers were so bad," he said. "Commercial growth was stagnated, and the EPA was not going to allow any more new buildings to be built."
Work on the Rock Creek Interceptor and the Miami Street storm sewer were among his first projects when he started in 1994.
Before he came to Tiffin, he worked for his father's company, Eagle Engineering and Supply in northern Michigan. He also served as city engineer and director of public service in Trotwood, Ohio, for eight years.
Eagle said he came to Tiffin after seeing an advertisement in a magazine saying the city was looking for a city engineer.
Engineering technician Mark Steinmetz said he has worked in the engineer's office with Eagle for five years.
"It's going to take some getting used to," Steinmetz said. "Curt did a great job, and he was here during some very important times in the history of the city of Tiffin, as far as advancements."
Tiffin Mayor Aaron Montz said he wishes Eagle the very best in his retirement.
"He's served the city for many years," Montz said. "I wish Curt the best, I hope he enjoys (his retirement), and hopefully he stays around the Tiffin area."
City Administrator Deb Reamer said she is surprised he is leaving, but is happy for him.
"He certainly deserves (to retire) for as long as he's been in the city," Reamer. "I know when it comes to the city (government), there's long hours, long details and a lot to take care of. We're nothing but happy for him."
Montz said the vacancy in the engineer's office will give the city an opportunity to redefine the position.
He said he is exploring the possibility of making the engineer also serve as a zoning commissioner and building inspector, which would allow the city to do building inspections instead of Richland County, which is under contract with Seneca County to enforce the state building codes.
Montz said he has a person in mind to serve as interim engineer, but nothing is confirmed yet.
Reamer said she and Montz got the idea of expanding the engineer's duties by visiting other Ohio cities. She said they had the idea before they knew about Eagle's retirement.
"We're looking to make some progressive changes that will help the city of Tiffin, and those around us as well," Reamer said.