The Most Recommended Plumbers in Los Angeles — Measured on Leading AI Assistants
Ask leading AI assistants for a plumber in Los Angeles and it answers with specific names. In July 2026 we logged those names systematically: 4 question styles, 4 checks, and 62 Los Angeles-area companies in the comparison set.
Every name below earned its place by being recommended — nobody paid and nobody applied. 24 companies were named this edition, and Red Lilly Plumbing alone was named in 3 of 4 checks.
Boss Plumbing, John's Plumbing & Drain Services and Mike Diamond Plumbing, HVAC & Electrical and 3 more landed just behind, named in 2 of 4 checks.
Why no "#1"? Because it wouldn't hold. Run the same questions again and the top name often changes, while the count of checks that named a company stays put — so the count is what we publish. A single mention isn't enough to make the list.
Los Angeles fielded the 13th-largest cohort of the 26 metros we measured this edition — 62 plumbers.
Only 24 of 62
plumbers we verified around Los Angeles were ever recommended — 39% of the cohort. AI's picks:
Rankings are measured and cannot be purchased — sponsored blocks are labeled advertising and sit outside the ranked list.
Ask AI the same question twice and the answer can change. So we do not crown a number one. We publish how many of the 4 checks named each company. Companies named in more checks are the ones AI keeps coming back to. Companies named in only one check are not listed: a single mention does not repeat reliably.
Named in 3 of 4 checks
One company, listed below.
- 3of 4
Red Lilly Plumbing
Los Angeles, CA · Recommended in 3 of 4 AI checks · 4.8★ (574 Google reviews)
AI pointed Los Angeles homeowners to Red Lilly Plumbing in 3 of the 4 checks. Its Google profile shows 4.8 stars from 574 reviews.
Named in 2 of 4 checks
6 companies, listed alphabetically — they scored the same, so nothing here puts one above another.
- 2of 4
Boss Plumbing
Los Angeles, CA · Recommended in 2 of 4 AI checks · 4.3★ (24 Google reviews)
Boss Plumbing came up in 2 of the 4 checks. It carries a 4.3-star rating across 24 Google reviews.
- 2of 4
John's Plumbing & Drain Services
Los Angeles, CA · Recommended in 2 of 4 AI checks · 4.9★ (463 Google reviews)
John's Plumbing & Drain Services came up in 2 of the 4 checks. It carries a 4.9-star rating across 463 Google reviews.
- 2of 4
Mike Diamond Plumbing, HVAC & Electrical
Los Angeles, CA · Recommended in 2 of 4 AI checks · 4.6★ (169 Google reviews)
Mike Diamond Plumbing, HVAC & Electrical surfaced in 2 of the 4 checks when we asked. Google reviewers back it up: 4.6 stars over 169 reviews.
- 2of 4
Nautilus Plumbing
Los Angeles, CA · Recommended in 2 of 4 AI checks · 4.8★ (158 Google reviews)
Nautilus Plumbing earned its place by showing up in 2 of the 4 checks. Its Google profile shows 4.8 stars from 158 reviews.
- 2of 4
Rooter Hero Plumbing & Air of Los Angeles
Gardena, CA · Recommended in 2 of 4 AI checks · 4.8★ (1,265 Google reviews)
AI pointed Los Angeles homeowners to Rooter Hero Plumbing & Air of Los Angeles in 2 of the 4 checks — the company is based in Gardena. Its Google profile shows 4.8 stars from 1,265 reviews.
- 2of 4
Western Rooter & Plumbing
Arcadia, CA · Recommended in 2 of 4 AI checks · 4.9★ (1,590 Google reviews)
Named in 2 of the 4 checks: Western Rooter & Plumbing, reaching the metro from Arcadia. Google reviewers back it up: 4.9 stars over 1,590 reviews.
3 more companies were named in exactly one of the 4 checks. A single mention comes back less than half the time when we ask again, so they are measured but not published.
Benchmark date: July 2026 · 4 checks · Measured, never sold — money cannot put a company on this list. Companies named in only one check are left off: one mention doesn't repeat reliably.
The exact questions we asked
No synthetic prompts — these are the questions homeowners actually ask, exactly as we ran them:
- “Who is the best plumber in Los Angeles, California?”
- “I have a plumbing emergency in Los Angeles, California. Which plumber should I call?”
- “What is the most recommended plumbing company in Los Angeles, California?”
- “Who should I hire to replace a water heater in Los Angeles, California?”
What the Los Angeles numbers say
- Not every winner sits downtown: Gardena and Arcadia all placed companies on the Los Angeles board.
- Los Angeles's 39% named rate runs above this edition's overall average of 36%.
- The nearest Los Angeles gets to a consensus pick is Red Lilly Plumbing, named in 3 of the 4 checks.
- Repeat recommendations are rare here: only 7 of the 24 names came up more than once, and only those are published.
Is your company on this list? Say so — for free.
Every listed company can claim a free embeddable "Most Recommended" badge for its website. It shows how many of our checks named you and links back to this page, so anyone can verify it's real.
Claim your free badgeIs your company missing from this list?
Every recommendation above is a new homeowner someone else got. Find out in 60 seconds where your company stands — free, no strings.
See if AI recommends youFree check by Fast Digital Marketing, the team behind this benchmark. How it works
Los Angeles questions, answered
How many Los Angeles plumbers does AI actually recommend?
Out of 62 verified Los Angeles-area companies, AI named 24 — 39%. 38 never surfaced in any of the 4 checks.
Which plumber does AI recommend most in Los Angeles?
Red Lilly Plumbing. It was named in 3 of the 4 checks in July 2026 — more consistently than any other company in the metro.
Why isn't there a number one on this list?
We tested it. Running the identical questions a second time moved the top name in a large share of markets, but a company named in most checks was named in most checks again. The reliable number is how many of the 4 checks named you — so that's what the page shows, and equal counts share a group.
What exactly did you ask leading AI assistants about Los Angeles plumbers?
The same questions real homeowners type — including "Who is the best plumber in Los Angeles, California?" and "I have a plumbing emergency in Los Angeles, California. Which plumber should I call?" — and we recorded every company named in the answers. The full set of phrasings is listed on this page.
Can a company pay to be on the Los Angeles list?
No. This list is measured, never sold — a company appears only if AI actually recommended it, in more than one check, when we asked. Money cannot buy a place on this list. Paid messages on this page are labeled "Sponsored" and sit outside the measured list.
How current is the Los Angeles list?
The numbers on this page are from July 2026. Each quarter we re-measure with identical methodology — the counts can and do change between editions.
New to Los Angeles? These plumbers are just getting started.
Everything above this line was measured. The list on this page comes from asking AI assistants real questions and counting who they named — no one can buy their way onto it.
This section is different, and we want to be plain about it. The businesses below are brand new. They have not been measured, they have no rank and no score, and they are not part of the list above. They are here because they asked to be, we checked that they are real, and a business that opened last month has no way to show up in a ranking built on history. Nobody paid for a spot here — it is free, and it is not an endorsement.
Just opened a company in Los Angeles? You can be the first one here.
Tell us who you are and we'll add you to this section — free. It is not a ranking and it will never say you are ranked, because you are not: you are new. When we re-run the benchmark, a real spot on the list above is something you earn, not something we hand out.
Add your new businessFull methodology: how these rankings are measured. Want the bigger picture? See every U.S. metro we benchmarked.