Which plumbers do AI assistants recommend in Los Angeles, CA?
We ask Google Gemini (with Google Search) the questions people really type, such as “Who is the best plumber in Los Angeles, CA?”, every week, sampling each question several times, and count which businesses they name. Period: 2026-W43. Updated 2026-10-20.
Businesses named by AI assistants
| # | Business | Mention rate | 95% confidence interval | Named first |
|---|---|---|---|---|
| 1 | John’s Plumbing & Drain Services Google Gemini 5/6 | 83% 5 of 6 answers | 44% to 97% | 1 |
| 2 | Boss Plumbing Google Gemini 5/6 | 83% 5 of 6 answers | 44% to 97% | 2 |
| 3 | Red Lilly Plumbing Google Gemini 5/6 | 83% 5 of 6 answers | 44% to 97% | 1 |
| 4 | Pacific Plumbing Team Google Gemini 5/6 | 83% 5 of 6 answers | 44% to 97% | 1 |
| 5 | Monkey Wrench Plumbing, Heating & Air Google Gemini 3/6 | 50% 3 of 6 answers | 19% to 81% | 0 |
| 6 | Moe Plumbing Services (H.L. Moe Co.) Google Gemini 3/6 | 50% 3 of 6 answers | 19% to 81% | 1 |
| 7 | Western Rooter & Plumbing Google Gemini 2/6 | 33% 2 of 6 answers | 10% to 70% | 0 |
| 8 | Leading Edge Plumbing & Rooter Google Gemini 2/6 | 33% 2 of 6 answers | 10% to 70% | 0 |
| 9 | JW Plumbing, Heating and Air Google Gemini 2/6 | 33% 2 of 6 answers | 10% to 70% | 0 |
| 10 | Twin Home Experts Google Gemini 1/6 | 17% 1 of 6 answers | 3% to 56% | 0 |
Mention rate = share of answers that name the business. The interval shows the range compatible with the sample: when two intervals overlap, the difference may be noise.
Where the AI assistants look
| Source cited | Share of answers |
|---|---|
| bestplumbingservicesinlosangeles.com | 100% |
| consumeraffairs.com | 100% |
| forbes.com | 67% |
| diamondcertified.org | 67% |
| reddit.com | 50% |
| rotorooter.com | 50% |
| quora.com | 50% |
| redlillyplumbing.com | 33% |
| angi.com | 33% |
| homeguide.com | 17% |
We can run the same measurement for your business, your competitors and your own questions, across more AI assistants. Write to jovianlabsstudio@gmail.com.
Questions
Does this mean these plumbers are the best?
No. It measures what AI assistants say, not service quality. AI answers can be incomplete or outdated.
Why do the results change from one answer to the next?
AI assistants do not give the same answer every time. That is why we sample each question several times and report confidence intervals.
How can a business appear more often?
The answers rely on the sources listed above: being present and well reviewed there is a good start. See the methodology.