Waseit study · US · collected 2026-09-13
Which plumbers do AI assistants recommend in San Diego?
We asked ChatGPT and Gemini 4 real buying questions about plumbers in San Diego - the way customers actually ask. 17 names came back for this trade in this city.
No name here is cited by more than one assistant: each of the 17 businesses found comes from a single engine. This is a field without consensus - being cited by one says nothing about the others.
The names the assistants cite most
- 1.Rooter Hero Plumbingcited 2 times · by ChatGPT
- 2.Contractors State License Boardcited 2 times · by Gemini
- 3.Mike Diamond Servicescited 1 time · by ChatGPT
- 4.The Plumbing Companycited 1 time · by ChatGPT
- 5.San Diego Plumbingcited 1 time · by ChatGPT
- 6.Horizon Plumbingcited 1 time · by ChatGPT
- 7.A1 Plumbingcited 1 time · by ChatGPT
- 8.Above & Beyond Plumbingcited 1 time · by ChatGPT
Counts are citations across our sampled answers for this trade and city, collected 2026-09-13 via the assistants' APIs. Answers vary between runs - across the whole study, assistants agreed with each other on only 3% of names. A snapshot, honestly labeled, not a permanent ranking.
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Full dataset and method: the 2026 US study (872 answers, 218 trade×city cells) · our methodology