NamedTest

Which plumbers does AI name in St. Louis, MO?

Roto-Rooter was the plumber AI named most often in St. Louis, MO: in 12 of 30 answers in October 2026.

Across 30 answers to 10 customer questions, Perplexity, Gemini (model knowledge) and ChatGPT named 49 different plumbers. The 6 named most often held 47% of all mentions.

Perplexity named Roto-Rooter most often (7 of 10 answers), Gemini named Hoffmann Brothers most often (6 of 10 answers) and ChatGPT named Maplewood Plumbing & Sewer most often (4 of 10 answers).

Answers collected October 14, 2026. AI answers change from day to day.

The plumbers AI named most

BusinessAnswers naming it
Roto-RooterNamed by Perplexity and Gemini and ChatGPT12 of 30
Maplewood Plumbing & SewerNamed by Perplexity and Gemini and ChatGPT11 of 30
Hoffmann BrothersNamed by Perplexity and Gemini and ChatGPT10 of 30
Tony LaMartina Plumbing CompanyNamed by Perplexity and Gemini and ChatGPT8 of 30
Drain Masters PlumbingNamed by Gemini and ChatGPT6 of 30
Flow King Rooter PlumbingNamed by Perplexity and Gemini and ChatGPT5 of 30
Benjamin Franklin Plumbing of West St. Louis CountyNamed by Perplexity and Gemini3 of 30
Classic Aire CareNamed by Gemini3 of 30
Linek Plumbing CompanyNamed by Perplexity3 of 30
Spire EnergyNamed by Gemini and ChatGPT3 of 30

Who each AI tool named

Perplexity

10 of its 10 answers named at least one business.

  1. Roto-Rooter (7)
  2. Flow King Rooter Plumbing (3)
  3. Linek Plumbing Company (3)
  4. Maplewood Plumbing & Sewer (3)
  5. Tony LaMartina Plumbing Company (3)
  6. Dunn Plumbing (2)
  7. Hoffmann Brothers (2)
  8. STL Plumbing Pros (2)
  9. 1 Good Drain Laying (1)
  10. A. Alpha Inc. (1)

Gemini (model knowledge)

10 of its 10 answers named at least one business.

  1. Hoffmann Brothers (6)
  2. Drain Masters Plumbing (5)
  3. Maplewood Plumbing & Sewer (4)
  4. Tony LaMartina Plumbing Company (4)
  5. Classic Aire Care (3)
  6. Benjamin Franklin Plumbing of West St. Louis County (2)
  7. Flow Master Plumbing (2)
  8. Roto-Rooter (2)
  9. Spartan Plumbing (2)
  10. Spire Energy (2)

ChatGPT

10 of its 10 answers named at least one business.

  1. Maplewood Plumbing & Sewer (4)
  2. Roto-Rooter (3)
  3. Able Rooter Plumbing & Drain Cleaning (2)
  4. Hoffmann Brothers (2)
  5. AA Quick Plumbing & Drain Cleaning (1)
  6. AAA Home Services (1)
  7. All Service Drain (1)
  8. Ambassador Plumbing (1)
  9. Barth Company Sewer & Water (1)
  10. Drain Masters Plumbing (1)

What AI named for each question

The businesses each AI tool named in its answer to each question, in the order the answer named them.

  1. I need an emergency plumber in St. Louis, MO right now. Who should I call?

    Perplexity

    1. Roto-Rooter
    2. Flow King Rooter Plumbing

    Gemini

    1. Hoffmann Brothers
    2. St. Louis Pipe & Plumbing
    3. Roto-Rooter
    4. Spire Energy

    ChatGPT

    1. Roto-Rooter
    2. Flow King Rooter Plumbing
    3. Spire Energy

  2. How much does drain cleaning cost in St. Louis, MO, and which plumbers charge fair prices?

    Perplexity

    1. Linek Plumbing Company
    2. STL Plumbing Pros
    3. St. Louis Plumbing
    4. Maplewood Plumbing & Sewer

    Gemini

    1. Flow-Right Plumbing
    2. Butler's Plumbing
    3. Tony LaMartina Plumbing Company
    4. Maplewood Plumbing & Sewer

    ChatGPT

    1. AA Quick Plumbing & Drain Cleaning
    2. All Service Drain

  3. Who is the most trusted plumber in St. Louis, MO?

    Perplexity

    1. Maplewood Plumbing & Sewer
    2. Tony LaMartina Plumbing Company

    Gemini

    1. Hoffmann Brothers
    2. Classic Aire Care
    3. St. Louis Pipe Repair (SLPR)
    4. Bi-State Plumbing
    5. Drain Masters Plumbing

    ChatGPT

    1. Kirkwood Plumbing
    2. Maplewood Plumbing & Sewer

  4. Which plumbing company in St. Louis, MO is best for water heater repair?

    Perplexity

    1. Tony LaMartina Plumbing Company
    2. Roto-Rooter
    3. Dunn Plumbing
    4. AAA Home Services
    5. Linek Plumbing Company

    Gemini

    1. Hoffmann Brothers
    2. Maplewood Plumbing & Sewer
    3. Drain Masters Plumbing
    4. Tony LaMartina Plumbing Company

    ChatGPT

    1. Maplewood Plumbing & Sewer

  5. My basement is flooding in St. Louis, MO. Which plumber can come today?

    Perplexity

    1. Roto-Rooter
    2. Armstrong Plumbing
    3. Flow King Rooter Plumbing
    4. The Flood Team

    Gemini

    1. Spartan Plumbing
    2. Classic Aire Care
    3. Drain Masters Plumbing
    4. Hoffmann Brothers
    5. Benjamin Franklin Plumbing of West St. Louis County
    6. Servicemaster
    7. Paul Davis Restoration
    8. Servpro
    9. Restoration 1

    ChatGPT

    1. Roto-Rooter
    2. Signature Plumbing

  6. Who is the most affordable plumber near St. Louis, MO?

    Perplexity

    1. Hoffmann Brothers
    2. Roto-Rooter
    3. STLCT
    4. Arch City Drain and Plumbing

    Gemini

    1. Flow Master Plumbing
    2. Drain Masters Plumbing
    3. Performance Plumbing
    4. Roto-Rooter

    ChatGPT

    1. Sure-Fix Plumbing
    2. Ambassador Plumbing

  7. Which plumbers in St. Louis, MO have the best reviews?

    Perplexity

    1. Maplewood Plumbing & Sewer
    2. Tony LaMartina Plumbing Company
    3. Roto-Rooter

    Gemini

    1. Hoffmann Brothers
    2. St. Louis Pipe Repair (SLPR)
    3. Classic Aire Care
    4. Maplewood Plumbing & Sewer
    5. Drain Masters Plumbing

    ChatGPT

    1. Hoffmann Brothers
    2. Tony LaMartina Plumbing Company
    3. Maplewood Plumbing & Sewer
    4. Drain Masters Plumbing
    5. Able Rooter Plumbing & Drain Cleaning

  8. I need water heater installation in St. Louis, MO. Which local plumber do you recommend?

    Perplexity

    1. Dunn Plumbing
    2. Flow King Rooter Plumbing
    3. Hoffmann Brothers
    4. Roto-Rooter
    5. Indoor Comfort Team

    Gemini

    1. Hoffmann Brothers
    2. Knies Plumbing & Heating
    3. Spartan Plumbing
    4. Maplewood Plumbing & Sewer

    ChatGPT

    1. AAA Home Services
    2. Able Rooter Plumbing & Drain Cleaning

  9. Is there a 24 hour plumber in St. Louis, MO that answers the phone at night?

    Perplexity

    1. Roto-Rooter
    2. Benjamin Franklin Plumbing of West St. Louis County
    3. Warrior Sewer & Drain

    Gemini

    1. Benjamin Franklin Plumbing of West St. Louis County
    2. Flow King Rooter Plumbing
    3. Royal Flush Plumbing
    4. Tony LaMartina Plumbing Company
    5. Spire Energy

    ChatGPT

    1. Landmark Plumbing
    2. Roto-Rooter

  10. What is a reasonable price for sewer line repair in St. Louis, MO, and who should I get quotes from?

    Perplexity

    1. Linek Plumbing Company
    2. STL Plumbing Pros
    3. Zoom Drain of St. Louis
    4. A. Alpha Inc.
    5. 1 Good Drain Laying

    Gemini

    1. Flow Master Plumbing
    2. Pipe Solutions
    3. Tony LaMartina Plumbing Company
    4. Sewer Solutions

    ChatGPT

    1. Tope Plumbing
    2. Maplewood Plumbing & Sewer
    3. Barth Company Sewer & Water
    4. Hoffmann Brothers

Sources AI cited

20 of the 30 answers cited sources. The sites cited most, by the number of answers citing them:

  1. rotorooter.com (8)
  2. homeadvisor.com (6)
  3. angi.com (5)
  4. hoffmannbros.com (5)
  5. bestprosintown.com (4)
  6. mrrooter.com (4)
  7. aaastl.com (3)
  8. bbb.org (3)
  9. flowkingstl.com (3)
  10. forbes.com (3)

Gemini (model knowledge) answers from what it learned in training, without a web search, so it cites no sources.

What the most-named plumbers have in common

5 of the 6 were named by all of Perplexity, Gemini and ChatGPT. The rest were named by one tool only, which is common: the tools search and remember differently.

4 of the 6 had their own website among the sources the answers cited, and AI gave a website for 6 of them.

By the kind of question: 5 of them came up for urgent requests, 5 for questions about price, 5 for questions about trust and reviews, and 6 for questions about a specific service.

How we measured this

We asked 10 questions a customer might ask about plumbers in St. Louis, MO, once on each AI tool, through each tool's official API. For example:

  • I need an emergency plumber in St. Louis, MO right now. Who should I call?
  • Who is the most trusted plumber in St. Louis, MO?
  • Which plumbing company in St. Louis, MO is best for water heater repair?

Perplexity searches the web and shows its sources. Gemini (model knowledge) answers without a web search, from what the model learned in training, so its picks can be out of date. A language model read each answer and listed the businesses it named, and a business counts once per answer. These results describe what AI said on these dates. They are not a rating of any business's work.

Data as of October 14, 2026.

Corrections

If a business name was misread, or a business is listed that has closed, email hello@namedtest.com. We check it against the stored answers and correct the page.

Does AI name your business?

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Read the guide: How to get AI to recommend your plumbing business

Questions about this page

Which plumbers does AI name most in St. Louis, MO?

Roto-Rooter was the plumber AI named most often in St. Louis, MO: in 12 of 30 answers in October 2026.

Which AI tools were asked, and when?

Perplexity, Gemini and ChatGPT, 10 customer questions each, answered between October 14, 2026 and October 14, 2026. Gemini (model knowledge) answers from what the model learned in training, without a web search.

How can a plumber get named by AI more often?

Make the business easy for AI to read and to trust: let AI crawlers into your website, keep your name, address and phone the same everywhere, answer common customer questions on your site, and earn reviews on the sites AI cites. The free check shows whether AI names your business today.