# Semper Flow Plumbing

**Trade:** Plumbing · **Phone:** (978) 460-9472 · **Website:** https://semperflowplumbingboston.com/ · **Languages:** English

**Rating: 4.2/5** (medium confidence) — from 51 reviews across 4 sources.
98% of sentiment-scored reviews read net-positive. Last 6 months: 6 reviews, 0 negative.

## The honest read

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.

**Strengths:**
- Fast emergency response — reviews describe same-night fixes for burst pipes and boilers
- Repeat customers — several reviewers say they've used him for years
- Clear communication — reviewers cite explanations of the issue and the fix
- Strong Google standing — 4.9 stars from 54 ratings

**Concerns:**
- One high bill — a 2025 review flagged $2,250 for a short showerhead job

## Claims & citations

Every claim below is backed by real evidence rows — uncited claims are dropped in code before publication.

- Somerville, MA plumbing company offering sinks and drains, water heater, boiler, and conversion services, plus bathroom and kitchen remodeling plumbing work, with 24/7 emergency availability _(confidence: high)_
  - [Official Website](https://semperflowplumbingboston.com) — “Semper Flow Plumbing is a Somerville, MA plumbing company founded by Marine veteran Nick Castoldi, offering sinks & drains, water heater, bo…”
- Company says it was founded in 2020 by Nick Castoldi, who trained as a plumber's apprentice starting in 2016 after two tours in the Marine Corps _(confidence: medium)_
  - [Official Website](https://semperflowplumbingboston.com) — “Company history (self-reported): Founded in 2020 by Nick Castoldi, who trained as a plumber's apprentice starting in 2016 after serving two …”
- Owner-operated by Nick Castoldi, a Marine Corps veteran and licensed plumber; self-described as veteran-owned _(confidence: medium)_
  - [Official Website](https://semperflowplumbingboston.com) — “Ownership (self-reported): Owner-operated by Nick Castoldi, a Marine Corps veteran and licensed plumber.”
  - [Official Website](https://semperflowplumbingboston.com) — “Stated ownership (self-reported): Veteran-owned”
- Stated service area of Revere, Medford, Everett, Malden, Somerville and Reading _(confidence: high)_
  - [Official Website](https://semperflowplumbingboston.com) — “Stated service area (self-reported): Revere, Medford, Everett, Malden, Somerville, Reading”
- Holds a 4.9-star average on Google from 54 ratings _(confidence: high)_
  - [Google](https://www.google.com/maps/search/?api=1&query=Semper%20Flow%20Plumbing&query_place_id=ChIJ3aFoiSw8GAIRJ0a68-FM5fw) — “Google: 4.9★ from 54 ratings”
- An April 2026 review described a burst pipe fixed the same night it happened _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2tkTE9FTkJWR1pqYzNSM2VrTm5Wbm8zUTBoZmMzYxAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOkdLOENBVGZjc3R3ekNnVno3Q0hfc3c%7C%7C?hl=en) — “5★ I had a pipe burst in the middle of the night, in a panic, I called Semper Flow. Nick came right out and resolved the issue. He was very …”
- January 2026 reviews described a boiler outage resolved within the hour, including at 3 a.m. _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21WNk5rbFBSRkJYU0VSTlYyOTRNVEZKWWkxWmQxRRAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOmV6NklPRFBXSERNV294MTFJYi1Zd1E%7C%7C?hl=en) — “5★ Nick showed up when we called in a pinch, 3am. Talk about a dependable company! Work is top notch and his apprentice didn’t disappoint. I…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21kS2NqWndkMHRTVWpCVGVIUk5iMmt0WTBjemEwRRAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOmdKcjZwd0tSUjBTeHRNb2ktY0cza0E%7C%7C?hl=en) — “5★ My boiler went out unexpectedly. Nick showed up with his crew within an hour. I could not be more thankful. I have since then, hired him …”
- A November 2025 review described a leaking garbage disposal replaced on time with an accurate estimate _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21kRU5teFlaMnhKU25wT1pHcDVTamxRTkVWS01IYxAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOmdENmxYZ2xJSnpOZGp5SjlQNEVKMHc%7C%7C?hl=en) — “5★ Amazing experience. I had a leaking garbage disposal and after I was out of town for a few months it got pretty bad. Nick and his crew ca…”
- A November 2025 review described installing a new water heater, water line, and full home water filtration system for first-time homebuyers _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21ObE5YWndlVlZqTWtWdk1YUTBhM0Z5Wlc5dFJsRRAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOmNlNXZweVVjMkVvMXQ0a3FyZW9tRlE%7C%7C?hl=en) — “5★ Nick at Semper Flow Plumbing did an unbelievable job. My wife and I just purchased our first home, and Nick came highly recommended to us…”
- An April 2025 review described diagnosing and fixing a noisy sump pump _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnTUNvc2VyNFVnEAE!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CIHM0ogKEICAgMCoser4Ug%7C%7C?hl=en) — “5★ I had an issue with my sump pump in my basement and the pump keeps taking a while of emptying and he was able to come over the next day a…”
- A 2026 review described plumbing adjustments to a vanity, shower trim, and toilet during a bathroom renovation, including replacing a shower with a tub _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2pkaldXUkhXRGx6YW5sb2NtdDZYM3BPYldWb1kzYxAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOjdjWWRHWDlzanlocmt6X3pObWVoY3c%7C%7C?hl=en) — “5★ We hired Nick to make some plumbing adjustments to vanity / shower trim / toilet during some bathroom renovations we had going on. He als…”
- A September 2025 review said the customer was charged $2,250 for an about-hour-long showerhead replacement _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2tKb1FXTkhXbGs1YmtRNU5sUkNUVEYyWTNSdlduYxAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOkJoQWNHWlk5bkQ5NlRCTTF2Y3RvWnc%7C%7C?hl=en) — “1★ I got Nick’s name from a home inspector, and he was fairly responsive and pleasant. I think he did decent work on a simple job.

He was a…”
- Specializes in Plumbing _(confidence: high)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2tkTE9FTkJWR1pqYzNSM2VrTm5Wbm8zUTBoZmMzYxAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOkdLOENBVGZjc3R3ekNnVno3Q0hfc3c%7C%7C?hl=en) — “5★ I had a pipe burst in the middle of the night, in a panic, I called Semper Flow. Nick came right out and resolved the issue. He was very …”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21kRU5teFlaMnhKU25wT1pHcDVTamxRTkVWS01IYxAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOmdENmxYZ2xJSnpOZGp5SjlQNEVKMHc%7C%7C?hl=en) — “5★ Amazing experience. I had a leaking garbage disposal and after I was out of town for a few months it got pretty bad. Nick and his crew ca…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21ObE5YWndlVlZqTWtWdk1YUTBhM0Z5Wlc5dFJsRRAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOmNlNXZweVVjMkVvMXQ0a3FyZW9tRlE%7C%7C?hl=en) — “5★ Nick at Semper Flow Plumbing did an unbelievable job. My wife and I just purchased our first home, and Nick came highly recommended to us…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sChZDSUhNMG9nS0VJQ0FnTUNvc2VyNFVnEAE!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CIHM0ogKEICAgMCoser4Ug%7C%7C?hl=en) — “5★ I had an issue with my sump pump in my basement and the pump keeps taking a while of emptying and he was able to come over the next day a…”
  - [Official Website](https://semperflowplumbingboston.com) — “Semper Flow Plumbing is a Somerville, MA plumbing company founded by Marine veteran Nick Castoldi, offering sinks & drains, water heater, bo…”
- Also offers HVAC / Heating & Cooling _(confidence: medium)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21WNk5rbFBSRkJYU0VSTlYyOTRNVEZKWWkxWmQxRRAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOmV6NklPRFBXSERNV294MTFJYi1Zd1E%7C%7C?hl=en) — “5★ Nick showed up when we called in a pinch, 3am. Talk about a dependable company! Work is top notch and his apprentice didn’t disappoint. I…”
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT21kS2NqWndkMHRTVWpCVGVIUk5iMmt0WTBjemEwRRAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOmdKcjZwd0tSUjBTeHRNb2ktY0cza0E%7C%7C?hl=en) — “5★ My boiler went out unexpectedly. Nick showed up with his crew within an hour. I could not be more thankful. I have since then, hired him …”
  - [Official Website](https://semperflowplumbingboston.com) — “Semper Flow Plumbing is a Somerville, MA plumbing company founded by Marine veteran Nick Castoldi, offering sinks & drains, water heater, bo…”
- Also offers Bathroom Remodel _(confidence: low)_
  - [Google Reviews](https://www.google.com/maps/reviews/data=!4m8!14m7!1m6!2m5!1sCi9DQUlRQUNvZENodHljRjlvT2pkaldXUkhXRGx6YW5sb2NtdDZYM3BPYldWb1kzYxAB!2m1!1s0x0:0xfce54ce1f3ba4627!3m1!1s2@1:CAIQACodChtycF9oOjdjWWRHWDlzanlocmt6X3pObWVoY3c%7C%7C?hl=en) — “5★ We hired Nick to make some plumbing adjustments to vanity / shower trim / toilet during some bathroom renovations we had going on. He als…”
  - [Official Website](https://semperflowplumbingboston.com) — “Semper Flow Plumbing is a Somerville, MA plumbing company founded by Marine veteran Nick Castoldi, offering sinks & drains, water heater, bo…”

## Ownership

- Identifies as veteran-owned — the business's own statement, not independently verified.

## License

Status: **not_found** — verified against the official MA state registry, never self-reported.
Re-check at the official registry: https://occupationallicensingandpermitting.mass.gov/madol/s/license-search-page

## Sources

- [Google](https://www.google.com/maps/search/?api=1&query=Semper%20Flow%20Plumbing&query_place_id=ChIJ3aFoiSw8GAIRJ0a68-FM5fw): 4.9★ from 54 ratings
- [Google Reviews](https://www.google.com/maps/search/?api=1&query=Semper%20Flow%20Plumbing&query_place_id=ChIJ3aFoiSw8GAIRJ0a68-FM5fw): Listed on this source
- [Official Website](https://semperflowplumbingboston.com): 6 yrs in business · Self-reported profile and service details
- [Exa](https://semper-flow-plumbing.wheree.com/): 0 web mentions across the open web (each linked to its source)

## Recent reviews

- **5/5 · Google Reviews · Boris Nikitin · 2026-08-25**: Nick was terrific to work with! We called Semper Flow Plumbing on a Sunday afternoon with an issue involving our water heater and high water pressure in our two-unit condo. Nick was able to come out the very next day to assess the situation.

He was extremely friendly, knowledgeable, and took the ti…
- **5/5 · Google Reviews · Jake Spiak · 2026-07-12**: Extremely professional, dependable, and quality work. I have used Nick many times and will continue to do so. The best!
- **5/5 · Google Reviews · Constantine Deir · 2026-07-01**: We hired Nick to make some plumbing adjustments to vanity / shower trim / toilet during some bathroom renovations we had going on. He also ripped out a shower and replaced with a tub in record time. Super friendly. Reasonably priced. Cleaned up well after the job. Everything you could hope for!
- **5/5 · Google Reviews · Sharon · 2026-05-26**: We had plaster fall from the bathroom ceiling at our old property, not knowing what was going on, I called Semper Flow and Nick came right out within a couple hours. He was great! He & his team assessed the issue quickly and repaired the pipe accordingly. His prices are reasonable and he's local so …
- **5/5 · Google Reviews · Kaylee M. Gentry · 2026-05-09**: Hire them. Great work, done right. Nick is funny, a perfectionist, and very kind. Super happy with the work he did for us.
- **5/5 · Google Reviews · Julie · 2026-04-11**: I had a pipe burst in the middle of the night, in a panic, I called Semper Flow. Nick came right out and resolved the issue. He was very professional and a great guy! Highly recommend.
- **5/5 · Google Reviews · Sandy · 2026-03-12**: Nick  was amazing great customer service will recommend to anyone! Very efficient and friendly! Explained everything that needed to be done
- **5/5 · Google Reviews · Amy Greenstein · 2026-03-06**: Nick was super responsive, a delight to interact with and provided a quick and cost effective fix. He is now be our go-to plumber!
- **5/5 · Google Reviews · Gilad Skolnick · 2026-03-06**: Easy to reach and communicate with- came by quickly, diagnosed the problem in our shower, and immediately fixed it. Very friendly, professional, and easy to work with.
- **5/5 · Google Reviews · Emily Watson · 2026-02-09**: Extremely responsive and helpful service

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Data freshness: last scanned 2026-09-09T10:44:05.700Z.
Cite as: Semper Flow Plumbing — Tavlee (https://tavlee.com/contractor/semper-flow-plumbing)
Source: https://tavlee.com/contractor/semper-flow-plumbing