I personally don't know the answer either, but we can do some research to find a likely answer:
The
RR database shows Stow's DPW frequency is 155.805, although there is no call sign listed it's a simple task to search the FCC database with this frequency & find that the Stow DPW repeater output is licensed on
KSQ754. The name on the license is the 'Stow Street Department' and 155.805 is listed as a repeater output (FB2) so it's a safe bet that this is the right license.
Looking at the license there is only one more frequency (153.845) and it's properly licensed as a repeater input (MO/FX1).
Give 153.845 a listen & see if you can confirm that it's in use.