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ContractorsRanked

Best Plumbers in Diamond Bar, CA (2026)

1,287 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Diamond Bar: Rooter Hero Plumbing & Air of San Gabriel Valley, CR Score 93/100; 4.9★ from 926 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Rooter Hero Plumbing & Air, posts 24/7 hours; ranked #2 of 1,287.

  3. 4

    Most-reviewed: Barker and Sons Plumbing & Rooter, 3,896 Google reviews at 4.8★, the most of 1,287 ranked; ranked #4.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

1,287 Diamond Bar plumbers are ranked here by CR Score, from 8 published factors. 683 are open 24/7, 1,055 open Saturdays and 842 open Sundays, based on posted hours. The median Google rating is 5.0★ across 1,287 rated businesses.

Top 10 plumbers in Diamond Bar at a glance

Top 10 plumbers in Diamond Bar at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Rooter Hero Plumbing & Air of San Gabriel Valley934.9★ (926)Diamond Bar24/7Overall
2Rooter Hero Plumbing & Air934.9★ (1,637)Pomona, 5 mi away24/7Emergencies
3Top Notch Plumbing Inc.925.0★ (515)Covina, 6 mi away24/7—
4Barker and Sons Plumbing & Rooter914.8★ (3,896)Anaheim, 12 mi away24/7Most reviews
5Dymek's Freedom Plumbing, Inc915.0★ (1,063)Anaheim, 12 mi away24/7—
624 Rooter & Plumbing, Inc.915.0★ (346)Claremont, 7 mi away24/7—
7Roto-Rooter Plumbing & Water Cleanup904.9★ (375)Rowland Heights, 5 mi away24/7—
8EZ Sewers Rooter and Plumbing905.0★ (130)Avocado Heights, 2 mi away24/7—
9Option One Plumbing904.8★ (3,017)Rancho Cucamonga, 15 mi away24/7—
10Western Rooter & Plumbing904.9★ (1,562)Arcadia, 15 mi away24/7—

The 1,287 best plumbers in Diamond Bar, ranked

Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.

Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  9. #9 Option One Plumbing

    Based in Rancho Cucamonga, 15 mi away

    90/100CR Score

    Ranked #9 because of its Google rating and availability: 4.8★ from 3,017 Google reviews, open 24/7.

    • 4.8★ from 3,017 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    10722 Arrow Route STE 602, Rancho Cucamonga, CA 91730
    View profile for Option One Plumbing(800) 905-7115

  19. #19 JB Plumbing

    Based in San Dimas, 6 mi away

    89/100CR Score

    Ranked #19 because of its Google rating and availability: 4.8★ from 396 Google reviews, open 24/7.

    • 4.8★ from 396 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    515 W Allen Ave #13, San Dimas, CA 91773
    View profile for JB Plumbing(909) 592-8487

Plumbers ranked #26 to #50

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 1,287 ranked plumbers here; the rest are on their profiles.

plumbers in Diamond Bar, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Bow Tie Plumbing & Rooter895.0★ (334)14 mi
27Drainflow Solutions & Plumbing895.0★ (276)12 mi
28Mr. Rooter Plumbing of Orange County894.9★ (560)13 mi
29Daley Plumbing895.0★ (144)3 mi
30Graham Plumbing and Drain Cleaning, Inc.894.9★ (287)10 mi
31Merry Plumbing895.0★ (652)18 mi
32High speed rooter & plumbing895.0★ (109)8 mi
33J's Plumbing895.0★ (207)12 mi
34Ramco Plumbing Heating & Air895.0★ (262)13 mi
35Rooter Hero Plumbing & Air of Anaheim894.8★ (1,233)16 mi
36Roto-Rooter Plumbing & Water Cleanup894.9★ (436)13 mi
37I Love Sewers Rooter And Plumbing Sewer Specialties Inc894.9★ (200)9 mi
38Orange Coast Plumbing894.9★ (1,243)20 mi
39Orange Coast Plumbing894.9★ (454)14 mi
40AS Plumbing Mechanical885.0★ (618)19 mi
41Jetters 'N' Drains Sewer & Pipe Lining Experts885.0★ (205)13 mi
42Peli Plumbing885.0★ (229)13 mi
43Eaton Family Plumbers884.8★ (143)In Diamond Bar
44AYS Plumbing & Rooter884.9★ (1,726)10 mi
45Plumbing Concepts, Inc.884.9★ (442)15 mi
46Roto-Rooter Plumbing & Water Cleanup884.8★ (936)16 mi
47Alpine Plumbing, Heating, and Air884.9★ (743)5 mi
48Holmer Plumbing & Drain, Inc885.0★ (173)12 mi
49Roto-Rooter Plumbing & Water Cleanup884.9★ (434)In Diamond Bar
50Rapid Rescue Rooter and plumbing885.0★ (82)7 mi

Also serving Diamond Bar

20 more plumbers within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.

Unranked plumbers serving Diamond Bar
BusinessGoogle ratingDistance
AK Plumbing5.0★ (70)4 mi
Alewine Construction CorpIn Diamond Bar
All Rooter Solutions5.0★ (2)8 mi
American West5.0★ (1)In Diamond Bar
Count-on Plumbing5.0★ (2)8 mi
Courtesy Plumbing4.8★ (387)6 mi
Currier Plumbing5.0★ (2)6 mi
Elite Rooter Plumbers4.7★ (752)13 mi
Hydro Backflow5.0★ (2)6 mi
I-Best Construction3.0★ (2)12 mi
JB Plumbing4.5★ (2)7 mi
MB Plumbing5.0★ (2)12 mi
Nickerson Brothers Plumbing Co5.0★ (2)11 mi
North Brothers Plumbing5.0★ (130)8 mi
Orange Coast Pipe5.0★ (2)6 mi
Plumber XP5.0★ (258)11 mi
Roto-Rooter Plumbing & Water Cleanup4.8★ (450)13 mi
Showtime-Vince Ruiz Plumbing4.5★ (2)8 mi
Solace Plumbing Heating and Air4.8★ (319)11 mi
Teddy Plumbing LLCIn Diamond Bar

How much do plumbers cost in Diamond Bar?

National price ranges in USD, not adjusted for Diamond Bar. Each row names its basis and the month we checked it.

How much do plumbers cost in Diamond Bar?
JobLowTypicalHighBasisChecked
Water heater replacement$882$1,348$1,826Per unit, installed (unit plus labor); typical range of customer-reported jobs. US national rangeOctober 2026

How to check a plumber's license in California

In California, Contractors State License Board (CSLB) licenses C-36 Plumbing contractor license.

Jobs of $1,000 or more in labor and materials (from January 1, 2025).

  1. Search the business name or license number on the Contractors State License Board (CSLB) license lookup.
  2. Check that the status is active and the name matches the contract or truck.
  3. Ask for proof of insurance before work starts.

No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.

Guide checked October 2026. How we verify licenses

How we ranked Diamond Bar plumbers

We scored 1,287 Diamond Bar plumbers on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.

Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Diamond Bar data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

Plumbers in Diamond Bar: frequently asked questions

Who is the best plumber in Diamond Bar?

By CR Score, the highest-ranked plumber in Diamond Bar, CA is Rooter Hero Plumbing & Air of San Gabriel Valley with a CR Score of 93/100. It has 4.9★ from 926 Google reviews. It is open 24/7. Rooter Hero Plumbing & Air (#2) and Top Notch Plumbing Inc. (#3) follow. We ranked 1,287 plumbers on 8 factors, last updated October 22, 2026.

How many plumbers are there in Diamond Bar?

ContractorsRanked ranks 1,287 plumbers serving Diamond Bar, CA. 3 of them are based in Diamond Bar; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.

Which plumbers in Diamond Bar are open 24/7?

683 ranked plumbers in Diamond Bar post 24/7 hours. The highest-ranked are Rooter Hero Plumbing & Air of San Gabriel Valley (#1), Rooter Hero Plumbing & Air (#2) and Top Notch Plumbing Inc. (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which plumbers in Diamond Bar work on weekends?

1,055 of 1,287 ranked plumbers post Saturday hours and 842 post Sunday hours. The highest-ranked open Saturdays are Rooter Hero Plumbing & Air of San Gabriel Valley (#1), Rooter Hero Plumbing & Air (#2) and Top Notch Plumbing Inc. (#3). Posted hours are office hours; crews may book weekend jobs separately.

How do I check a plumber's license in California?

In California, Contractors State License Board (CSLB) handles licensing and covers C-36 Plumbing contractor license. Search the business or license number at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/CheckLicense.aspx. Jobs of $1,000 or more in labor and materials (from January 1, 2025).

How much does water heater replacement cost in Diamond Bar?

Water heater replacement typically costs $882 to $1,826, with $1,348 typical (Per unit, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Diamond Bar. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Diamond Bar plumbers have?

The median Google rating among 1,287 rated plumbers in Diamond Bar is 5.0★, with a median of 22 reviews. Barker and Sons Plumbing & Rooter has the most, 3,896 reviews, and ranks #4. We adjust ratings for review count, so a few five-star reviews cannot top the list.

How does ContractorsRanked rank plumbers?

Each plumber gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Update log for Diamond Bar

  1. October 2026: CR Scores recalculated for 1,287 plumbers serving Diamond Bar.
  2. October 2026: 15 duplicate listings merged.

More plumbers and Diamond Bar pages

Other trades in Diamond Bar