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Plumbing contractor prospect list · San Mateo, CA

27 Plumbing contractors in San Mateo, CA — scored for agency prospecting

San Mateo has 27 active plumbing contractors profiled on LocalVein, with a median vulnerability score of 8 out of 100. About 19% operate without a website — the single strongest signal that a local service business is open to hiring a marketing agency.

Businesses
27
Median score
8
No website
19%
Updated
Apr 2026

The plumbing contractor market in San Mateo

Pre-1970 is the majority in San Mateo: a median build year of 1964 tells you original infrastructure dominates the rooftops. The agency opportunity for plumbing contractors here comes from fatigue, not choice — owners facing galvanized pipe, knob-and-tube, or aged masonry already know the work is coming. Outbound that leads with "planned major-system replacement" massively outperforms generic "need work done?" pitches in a housing cohort this deep into its second design cycle, and the volume of plumbing jobs compounds on referrals as one neighbor's pipe burst seeds the next block's pre-emptive swap.

Only 27 plumbing contractors appear in the San Mateo index, and that thinness is actually a gift for agency prospecting: the entire list fits in a single focused week of personalized outreach. No need for template-at-scale tactics — every operator can get a bespoke teardown of their Google presence, their review trajectory, and their ad-pixel status, and the close rate on that kind of direct attention in a sparse vertical tends to run far higher than in any crowded market.

Of 27 plumbing contractors scored in San Mateo, 0 carry vulnerability scores above 50 — 0% of the market. 19% have no website at all, the single strongest signal that an operator is leaving paid-discovery revenue on the table. Agencies who lead with the missing-website angle tend to convert this slice well — there's no harder pitch to argue with than "your competitors are showing up on Google for searches you can't."

Businesses
27
Median rating
5.0★
Median reviews
49
No website
19%

US benchmarks: median review count 32, share of operators with no website 22%. Markets where either number sits well above the benchmark concentrate more agency-ready prospects per outreach hour.

Where the 27 plumbing contractors land on the 0–100 score

0–1011–2021–3031–4041–5051–6061–7071–8081–9091–100
Of 27 plumbing contractors scanned, 0 scored above 50 — the zone where agencies report the highest close rates.

A sample of San Mateo plumbing contractors we've profiled

  • Half Moon Bay Guaranteed Plumbingplumbing contractor · 5.0★ · 1 review
  • Mr Drain Plumbing Hillsborougplumbing contractor · 5.0★ · 1 review
  • Miramar Plumbing Incplumbing contractor · 5.0★ · 4 reviews
  • Speedy Plumbing & Heatingplumbing contractor · 5.0★ · 57 reviews
  • United Pro Handyman Servicesplumbing contractor · 4.9★ · 60 reviews

Showing 5 of 27. Vulnerability scores, phone numbers, line types and full enrichment data are available to signed-in members.

How we measure opportunity

Demographic intelligence

Public-sector demographic data

Population, household income, home value, homeownership rate, median year structure built and self-employment density come from authoritative public demographic releases. Refreshed annually.

Business signals

Live business records

Business names, addresses, ratings, review counts, websites, phone numbers and operating status come from live business records. Each profiled business is re-checked regularly so stale data drifts off the page.

Scoring weights

Composite vulnerability score

We blend 19 signals (review velocity, star rating, website presence and freshness, ad pixels, hiring activity, competitor density and visual brand, plus eleven more) into a 0–100 score. Higher means more likely to engage with marketing services.

Frequently asked

How many plumbing contractors are in San Mateo, CA?
LocalVein's latest scan of San Mateo identified 27 active plumbing contractors. Median review count is 49, with a median Google rating of 5.0 stars. Refreshed April 2026.
How does LocalVein rank plumbing leads for vulnerability?
Plumbing contractors in San Mateo are comparatively healthy on the obvious signals, so the ranking leans on the composite rather than any one red flag. The median plumbing contractor here scores 8/100, and 0 operators clear 50 — the band where new agency outreach tends to land. Treat the score as a starting filter, then open the contributing signals on the operators you actually want to work.
What percent of San Mateo plumbing contractors have no website?
19% of plumbing contractors in San Mateo have no website at all in our index. No website is the single strongest "leaving money on the table" signal we track, and most agencies start their outbound by sorting on this column.
Can I get phone numbers and line types for San Mateo plumbing contractors?
Yes — LocalVein exports full phone numbers on every paid plan. Phone line type detection (mobile / landline / VoIP) is a Core-tier and above feature, which agencies use to route SMS-eligible prospects to a separate outreach sequence than landline-only operators. Paid plans also surface a contact email for each business that publishes one on its own site — coverage is not universal. For San Mateo's plumbing contractors, line types populate on the first paid scan and persist indefinitely — phone line types almost never change.
How often is the San Mateo plumbing list refreshed?
Each plumbing contractor record is re-checked whenever a user scans the vertical. San Mateo's demographic numbers (population, home value, demographic signals used in the vulnerability score) refresh annually. Most recent refresh on this page: April 2026.
What you see vs. what you get

The rest of plumbing contractors in San Mateo is behind a free signup.

Public view (this page)
  • 5 sample businesses
  • Phones masked (last 2 digits)
  • No phone line-type classification
  • No CSV export
  • No vulnerability ranking on the full list
Free plan (a free scan)
  • all 27 businesses
  • Full phone numbers
  • Ranked by vulnerability score
  • Demographic intelligence per market
  • Generic CSV export (CRM-ready)
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