National Grid is the gas service provider for the City of Watertown.
Report a Gas Emergency: 800-233-5325
Customer Support: 800-732-3400
New Gas Service: 877-696-4743
Credit and Collections: 800-732-3400
Claims (Insurance): 781-907-3930
Home Energy Audit: 800-632-8300
MassSave: 877-378-2748
Report a Suspected Energy Theft: 800-233-5325