According to the City Charter and Code of Ordinances, the mayor's salary can be changed only with 2/3 approval from the City Council, and the alteration would not take effect until one year after approval.
(Update: A City Councilor just e-mailed to pass along his understanding that the mayor's annual stipend is actually $6,500. I'll get confirmation this afternoon and post a correction if necessary.)
(Update, Part Deux: City Clerk Lynda Adams confirmed the mayor of Westbrook does in fact earn $6,500 per year, a salary level that was last changed in December 1987. So excuse me while I curse my electronic copy of the City Charter and Code of Ordinances that claims to have been updated as of May 19, 2009 and scrub the egg off my face.)
- John C.L. Morgan