Plumbers in Washington DC that AI assistants recommend

Name: AI assistant recommendations: Plumbers in Washington DC, November 2026
Creator: AIGROW
License: https://creativecommons.org/licenses/by/4.0/

John C. Flood is named most, in 61% of 36 answers.

The ranking

AI Recommendation Rate

1John C. Flood61%
95%: 45 to 75%
ChatGPT
75%
Claude
83%
Gemini
25%
Questions
4 of 4
Avg. position
2.2
Named in answers to
- Who is the best plumber in Washington DC?, from ChatGPT and Claude
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from ChatGPT, Claude and Gemini
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from ChatGPT, Claude and Gemini
- Which plumber in Washington DC would you trust to replace a water heater?, from ChatGPT and Claude
Also written John C. Flood of DC, John C. Flood of VA, Inc., John C. Flood of VA, John C. Flood of Virginia, Maryland and DC
Is this your business?
2Len The Plumber61%
95%: 45 to 75%
ChatGPT
67%
Claude
100%
Gemini
17%
Questions
4 of 4
Avg. position
2.4
Named in answers to
- Who is the best plumber in Washington DC?, from ChatGPT, Claude and Gemini
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from ChatGPT and Claude
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from ChatGPT, Claude and Gemini
- Which plumber in Washington DC would you trust to replace a water heater?, from ChatGPT and Claude
Also written Len The Plumber Heating & Air
Is this your business?
3Michael & Son Services58%
95%: 42 to 73%
ChatGPT
75%
Claude
100%
Gemini
0%
Questions
4 of 4
Avg. position
1.9
Named in answers to
- Who is the best plumber in Washington DC?, from ChatGPT and Claude
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from ChatGPT and Claude
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from ChatGPT and Claude
- Which plumber in Washington DC would you trust to replace a water heater?, from ChatGPT and Claude
Is this your business?
4Magnolia Plumbing, Heating & Cooling39%
95%: 25 to 55%
ChatGPT
25%
Claude
0%
Gemini
92%
Questions
4 of 4
Avg. position
1.6
Named in answers to
- Who is the best plumber in Washington DC?, from Gemini
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from ChatGPT and Gemini
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from Gemini
- Which plumber in Washington DC would you trust to replace a water heater?, from Gemini
Is this your business?
5Spartan Plumbing, Heating and Air Conditioning31%
95%: 18 to 47%
ChatGPT
0%
Claude
0%
Gemini
92%
Questions
4 of 4
Avg. position
2
Named in answers to
- Who is the best plumber in Washington DC?, from Gemini
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from Gemini
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from Gemini
- Which plumber in Washington DC would you trust to replace a water heater?, from Gemini
Also written Spartan Plumbing, Heating & Air Conditioning
Is this your business?
6W.H.C. Plumbing & Heating14%
95%: 6 to 29%
ChatGPT
0%
Claude
0%
Gemini
42%
Questions
2 of 4
Avg. position
3
Named in answers to
- Who is the best plumber in Washington DC?, from Gemini
- Which plumber in Washington DC would you trust to replace a water heater?, from Gemini
Is this your business?
7Ranazzi Mechanical11%
95%: 4 to 25%
ChatGPT
0%
Claude
33%
Gemini
0%
Questions
2 of 4
Avg. position
3.8
Named in answers to
- Who is the best plumber in Washington DC?, from Claude
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from Claude
Also written Ranazzi Plumbing
Is this your business?
8Ranney's Plumbing & Air11%
95%: 4 to 25%
ChatGPT
0%
Claude
33%
Gemini
0%
Questions
3 of 4
Avg. position
3.8
Named in answers to
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from Claude
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from Claude
- Which plumber in Washington DC would you trust to replace a water heater?, from Claude
Also written Ranney Plumbing, Heating & Air, Ranney's Plumbing & Heating
Is this your business?
9Ranger Design Build8%
95%: 3 to 22%
ChatGPT
0%
Claude
25%
Gemini
0%
Questions
2 of 4
Avg. position
1.7
Named in answers to
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from Claude
- Which plumber in Washington DC would you trust to replace a water heater?, from Claude
Also written Ranger Design Build Plumbing, Ranger Design Build Plumbing Heating & Air
Is this your business?
10Lenox Plumbing8%
95%: 3 to 22%
ChatGPT
25%
Claude
0%
Gemini
0%
Questions
2 of 4
Avg. position
2
Named in answers to
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from ChatGPT
- Which plumber in Washington DC would you trust to replace a water heater?, from ChatGPT
Is this your business?
11Joe The Plumber DC8%
95%: 3 to 22%
ChatGPT
0%
Claude
25%
Gemini
0%
Questions
2 of 4
Avg. position
5
Named in answers to
- Who is the best plumber in Washington DC?, from Claude
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from Claude
Is this your business?
12CroppMetcalfe6%
95%: 2 to 18%
ChatGPT
0%
Claude
0%
Gemini
17%
Questions
2 of 4
Avg. position
2.5
Named in answers to
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from Gemini
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from Gemini
Is this your business?
13Sila Heating, Air Conditioning & Plumbing6%
95%: 2 to 18%
ChatGPT
17%
Claude
0%
Gemini
0%
Questions
2 of 4
Avg. position
3.5
Named in answers to
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from ChatGPT
- Which plumber in Washington DC would you trust to replace a water heater?, from ChatGPT
Is this your business?
14Joseph Plumbing6%
95%: 2 to 18%
ChatGPT
0%
Claude
17%
Gemini
0%
Questions
2 of 4
Avg. position
4
Named in answers to
- I have a leaking pipe at home in Washington DC. Which plumbing company should I call?, from Claude
- I need an emergency plumber in Washington DC tonight. Who would you recommend?, from Claude
Is this your business?
15Joseph Reid Plumbing & Heating6%
95%: 2 to 18%
ChatGPT
0%
Claude
17%
Gemini
0%
Questions
1 of 4
Avg. position
4
Named in answers to
- Which plumber in Washington DC would you trust to replace a water heater?, from Claude
Is this your business?

Open a row to see each assistant's share of its own answers. Questions counts how many of the four produced the name at least once; position is where it came in the answer's list, 1 being first. 18 more names came up in a single answer and are counted above but not listed.

Plumbers in Washington DC: is this your field?

33different names in 36 answers, 18 of them only once. The assistants change their minds from one answer to the next.

Check whether AI names you

Is this your business?

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No business can pay to appear in the Index, rise in it or be removed from it. How the Index stays neutral

AI Visibility Index · November 2026

Asked about plumbers in Washington DC, ChatGPT, Claude and Gemini named John C. Flood most often, in 61% of answers (its AI Recommendation Rate), then Len The Plumber (61%). Across 36 answers they named 33 different businesses, 18 of them only once. Each of four buyer questions was asked three times, in English, in November 2026.

The AI Recommendation Rate is the fraction of the 36 answers that named a business. The range under it is a 95% confidence interval: where two ranges overlap, the gap between those businesses could be chance.

Names are printed as the assistants wrote them. We have not checked that any of them is good, open, or real.

61% of answers named John C. Flood

Answers: 36
Businesses named: 33
Named only once: 18
Named by 2+ assistants: 4 of 15
Named again on a rerun: 57%

Edition November 2026. Download the data

What each assistant said

The same questions, the same number of times, and often different names. Each column is one assistant's top five from the ranking above, with the share of its own answers that named them.

#	ChatGPT	Claude	Gemini
1	John C. Flood75%	Len The Plumber100%	Magnolia Plumbing, Heating & Cooling92%
2	Michael & Son Services75%	Michael & Son Services100%	Spartan Plumbing, Heating and Air Conditioning92%
3	Len The Plumber67%	John C. Flood83%	W.H.C. Plumbing & Heating42%
4	Magnolia Plumbing, Heating & Cooling25%	Ranazzi Mechanical33%	John C. Flood25%
5	Lenox Plumbing25%	Ranney's Plumbing & Air33%	Len The Plumber17%

Questions about plumbers in Washington DC

How AI assistants recommend plumbers

ChatGPT, Claude and Gemini named John C. Flood most often, in 61% of 36 answers, then Len The Plumber (61%) and Michael & Son Services (58%). The names come from what the assistants answered to four buyer questions in November 2026; we have not checked that any of them is good, open or real.

Not always. ChatGPT named John C. Flood most often (75% of its answers), Claude Len The Plumber (100%) and Gemini Magnolia Plumbing, Heating & Cooling (92%). 4 of the 15 listed businesses were named by two or more of them.

Each question was asked three times. Of the names an assistant gave for a question, 57% came back in two or more of those runs; the rest came up once. The 95% range beside each rate in the ranking shows how far it could move by chance.

Run the free checker: it asks ChatGPT, Claude, Gemini and Grok two of the Index questions for plumbers, with the category and the place already filled in, and shows every answer word for word. About 30 seconds, no sign-up. The page on how AI assistants recommend plumbers shows what an owner can work on. Nothing can guarantee that an assistant names you.

Named here? Put it on your site

Every business in the ranking was named in two or more answers. The badge says that and nothing more: no position, because the ranges above do not support one. It links back to this page, so anyone can check.

Correct or remove a listing

<a href="https://aigrow.gg/index/plumbers/washington-dc"><img src="https://aigrow.gg/badges/index/2026-11/plumbers/washington-dc.svg" width="312" height="100" alt="Named by AI assistants: Plumbers in Washington DC, AIGROW AI Visibility Index, November 2026"></a>

The questions

Asked word for word, three times each, to every assistant. The prompt is the one the free scan uses. No web search, no location and no chat history, so every answer starts from the same place.

1Who is the best plumber in Washington DC?
2I have a leaking pipe at home in Washington DC. Which plumbing company should I call?
3I need an emergency plumber in Washington DC tonight. Who would you recommend?
4Which plumber in Washington DC would you trust to replace a water heater?

How to read this page

The full method

What it measures: Which names these models produce when asked cold, from what they learned in training. It is not a review, a rating or our recommendation, and a business missing here may simply be one the models were never shown.
Why the ranges matter: 36 answers is a sample. Asked again next month, most shares will move by a few points; the ranges say how far they could move by chance alone.
One business, several spellings: Branches, legal suffixes and spellings of one business are merged, and the other spellings are printed under its name. Names that might be two businesses are kept apart.
A name is wrong: If a business here is closed, misnamed or yours and you want it removed, tell us. We correct or remove it when the page is next published.

Where the assistants look

The sites read most often, with web search on, before the assistants answer about this category in the United States. From the AI Source Map: 11 answers.

See every site for this category