Semper Flow Plumbing

Semper Flow Plumbing is the plumber people call in the middle of the night — reviewers describe getting Nick Castoldi on the phone and having him at the door within the hour, whether it's 3 a.m. or a Sunday afternoon. Castoldi, a Marine Corps veteran, says he founded the Somerville company in 2020 after training as a plumber's apprentice starting in 2016, and he still runs the jobs himself out of a stated service area covering Somerville, Medford, Everett, Malden, Revere and Reading. There are 51 reviews on file from 2024 through 2026, nearly all five stars, but the count matters less than how specific and consistent they are about the same things: fast callbacks, clear explanations, and fair pricing. A burst pipe in the middle of the night got fixed that same night (April 2026); a boiler that died unexpectedly had Nick and his crew there within the hour (January 2026); a leaking garbage disposal, a noisy sump pump, and a whole-home water filtration system installed for a couple's first house purchase (November 2025) all get the same kind of specific, positive account. Several reviewers say they've used him repeatedly over the years and now treat him as their regular plumber. One review stands apart from the rest: in September 2025, a customer who found Nick through a home inspector said he did decent work replacing a showerhead in about an hour, but charged $2,250 for it — a bill nothing else in these reviews comes close to. It's worth getting a clear price up front, especially for a small job. For everyday plumbing and especially emergencies — a burst pipe, a dead boiler, a leaking water heater — Semper Flow is a well-corroborated call across dozens of reviews; just confirm the price before work starts, given how far that one bill stood out from the rest.