On-call plumber

[lomagna.livejournal.com]

Any recommendations for a last-minute plumber in Somerville or Cambridge that would answer the phone on a Sunday?

My kitchen sink is overflowing spontaneously, possibly related to a different unit in the building. Disposal drains it but then it spurts back! Not sewage... but also doesn't appear to be a clog.

Landlord and management company are not responsive. :/

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EDIT: Landlord gave the green light to call a plumber before there were any comments here, so I ended up calling Alewife Company based on their good yelp reviews. They diagnosed that the main building drain was clogged and referred me to Crystal Clear Drains. Basically when units above us used their kitchen water, it was draining into our sink. Crystal Clear arrived in about an hour and took care of it!