Hazmat crews responded to a house in Montville Friday afternoon to investigate a letter giving off a strange smell.
According to fire officials, an envelope or at 1307 Route 163 had a very strong chemical odor coming from it.
Montville firefighters, a hazmat team from Sub Base Groton and crews from the Department of Energy and Environmental protection all responded to the scene.
The homeowner suffered a slight eye irritation, but was otherwise not injured, according to the DEEP.
The letter was sent to a lab for testing, but field tests showed no unusual readings, officials said.