AI Thinks That
What AI actually recommends — captured, ranked, kept honest.
← San Francisco City Guide · plumbers · snapshot 2026-10-07

Who are the best plumbers in San Francisco?

AI thinks that the top 10 plumbers in San Francisco are…

How it works

We asked every big AI at once the same buyer questions, verbatim. Here’s what they actually said — the Top 10, and all 43 they named.

Top 10

#BusinessNamedNamed by
1Ace Plumbing6×Claude, Google AI, Perplexity
2Ace Plumbing & Rooter6×Claude, Google AI, Perplexity
3Magic Plumbing5×Claude, Google AI
4Cabrillo Plumbing, Heating and Cooling4×Google AI, Perplexity
5Genteel Plumbers3×Claude, Perplexity
6Mr. Rooter Plumbing of San Francisco at3×Perplexity
7Advanced Plumbing & Drain2×Google AI
8Ask About Older Piping Systems2×Google AI
9California Contractors State License Board (CSLB)2×Google AI
10Fast Response Plumbing & Rooter2×Claude

Full ranking (43)

#BusinessNamedNamed by
1Ace Plumbing6×Claude, Google AI, Perplexity
2Ace Plumbing & Rooter6×Claude, Google AI, Perplexity
3Magic Plumbing5×Claude, Google AI
4Cabrillo Plumbing, Heating and Cooling4×Google AI, Perplexity
5Genteel Plumbers3×Claude, Perplexity
6Mr. Rooter Plumbing of San Francisco at3×Perplexity
7Advanced Plumbing & Drain2×Google AI
8Ask About Older Piping Systems2×Google AI
9California Contractors State License Board (CSLB)2×Google AI
10Fast Response Plumbing & Rooter2×Claude
11George Salet Plumbing2×Claude
12Grady Plumbing2×Google AI
13O'Grady Plumbing2×Google AI
14One Source Plumbing and Rooter2×Perplexity
15O’Grady Plumbing2×Google AI
16Roto-Rooter San Francisco2×Perplexity
17Specialties2×Google AI
18Angi (formerly Angie's List)1×Claude
19ARS/Rescue Rooter1×Perplexity
20Ask the Right Questions1×Claude
21Atlas Plumbing1×Perplexity
22Atlas Plumbing & Rooter1×Perplexity
23BBB-accredited plumbers1×Perplexity
24Best Overall Ace Plumbing1×Claude
25CastleWorks Home Services1×Perplexity
26Check Licensing1×Claude
27Chosen Rooter & Plumbing1×Claude
28Clarify Emergency Rates1×Google AI
29Contractors State License Board (CSLB)1×Claude
30Experience with SF Municipal Codes1×Google AI
31Flat Rate vs. Hourly1×Google AI
32Heise’s Plumbing1×Google AI
33Hydro Plumbing1×Perplexity
34Hydro Plumbing & Rooter1×Perplexity
35Key highlight1×Google AI
36Mandatory Sewer Lateral Ordinance1×Google AI
37Recommendation1×Perplexity
38Top Recommended Plumbers in San Francisco1×Google AI
39Use Trusted Review Platforms1×Claude
40Verify Licensing1×Google AI
41Why call them1×Google AI
42Why them1×Google AI
43Yelp. Ace Plumbing1×Claude

How this list was made

When2026-10-07 — a single snapshot. Engines5 queried; returned answers: Claude, Google AI, Perplexity, openai. Prompts3 buyer questions, asked verbatim; every engine got all. Answers12 captured verbatim (engine + timestamp), nothing edited. Rankingby number of mentions across all answers; ties broken by engines naming it. Mentions ≠ quality. Coverage43 businesses named in total. Independencenothing bought or placed; Memeador is not in the ranking.

Prompts asked

  1. “Who are the best plumbers in San Francisco, California?”
  2. “Can you recommend a good plumber near San Francisco, California?”
  3. “I'm looking for a good plumber in San Francisco, California. Who should I call, and why?”

Is your business on the list?

Run the free AI check to see if AI recommends you — and what it recommends instead. memeador.com/ai-visibility →

These scores are live — click any business to see how often AI named it over time; click again to close.