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Emergency Plumbers in Diamond Bar, CA (2026)

Top 50 of 1,282 plumbers, in emergency orderUpdated 0 paid placements in this rankingHow we rank

25 of the 50 plumbers on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.

Burst pipe or major leak: shut off the main water valve first. If water reaches outlets or the panel, stay clear and call 911.

The short answer

  1. 1

    #1 for emergency plumbing in Diamond Bar: Rooter Hero Plumbing & Air of San Gabriel Valley, open 24/7.

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

Top emergency plumbers in Diamond Bar at a glance

Top emergency plumbers in Diamond Bar at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Rooter Hero Plumbing & Air of San Gabriel Valley654.9★ (926)Diamond Bar24/7
2Rooter Hero Plumbing & Air654.9★ (1,637)Pomona, 5 mi away24/7
3Barker and Sons Plumbing & Rooter644.8★ (3,896)Anaheim, 12 mi away24/7
4Top Notch Plumbing Inc.635.0★ (515)Covina, 6 mi away24/7
5Option One Plumbing634.8★ (3,017)Rancho Cucamonga, 15 mi away24/7
6High Speed Plumbing634.8★ (542)Pomona, 6 mi away24/7
7Dymek's Freedom Plumbing, Inc635.0★ (1,063)Anaheim, 12 mi away24/7
8Roto-Rooter Plumbing & Water Cleanup634.9★ (375)Rowland Heights, 5 mi away24/7
924 Rooter & Plumbing, Inc.635.0★ (346)Claremont, 7 mi away24/7
10Service Lion Plumbing Heating Air Electric634.7★ (1,173)Brea, 10 mi away24/7

Call an emergency plumber in Diamond Bar now

24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.

The 50 emergency plumbers in Diamond Bar, ranked

24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 1,282 is on the plumbers page.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  5. #5 Option One Plumbing

    Based in Rancho Cucamonga, 15 mi away

    63/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.8★ from 3,017 Google reviews, listed on Google as “Plumber”.

    • 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

  16. #16 Courtesy Plumbing

    Based in Covina, 6 mi away

    62/100CR Score

    Ranked #16 because of its Google rating and trade focus: 4.8★ from 387 Google reviews, listed on Google as “Plumber”.

    • 4.8★ from 387 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    601 E Edna Pl, Covina, CA 91723
    View profile for Courtesy Plumbing(626) 967-5655

  17. #17 JB Plumbing

    Based in San Dimas, 6 mi away

    62/100CR Score

    Ranked #17 because of its Google rating and trade focus: 4.8★ from 396 Google reviews, listed on Google as “Plumber”.

    • 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

  21. #21 The Rooter Company

    Based in Brea, 9 mi away

    62/100CR Score

    Ranked #21 because of its Google rating and trade focus: 4.9★ from 350 Google reviews, listed on Google as “Plumber”.

    • 4.9★ from 350 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    375 Cliffwood Park St, Brea, CA 92821
    View profile for The Rooter Company(714) 439-8892

Top 50 of 1,282 plumbers by emergency score

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.

plumbers in Diamond Bar, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Good News Plumbing & Drain624.9★ (237)8 mi
27Mr. Rooter Plumbing of Orange County614.9★ (560)13 mi
28Graham Plumbing and Drain Cleaning, Inc.614.9★ (287)10 mi
29Iron Mountain Plumbing615.0★ (310)12 mi
30Orange Coast Plumbing615.0★ (435)14 mi
31Elite Rooter Plumbers614.7★ (752)13 mi
32Roto-Rooter Plumbing & Water Cleanup614.8★ (936)16 mi
33AA Atlas Plumbing, Heating, & Air615.0★ (179)9 mi
34Plumber XP615.0★ (258)11 mi
35Monkey Wrench Plumbing, Heating, Air & Electric615.0★ (160)9 mi
36Roto-Rooter Plumbing & Water Cleanup614.9★ (436)13 mi
37I Love Sewers Rooter And Plumbing Sewer Specialties Inc614.9★ (200)9 mi
38Orange Coast Plumbing614.9★ (1,243)20 mi
39Orange Coast Plumbing614.9★ (454)14 mi
40Roto-Rooter Plumbing & Water Cleanup614.8★ (450)13 mi
41Solace Plumbing Heating and Air614.8★ (319)11 mi
42Bow Tie Plumbing & Rooter615.0★ (334)14 mi
43Drainflow Solutions & Plumbing615.0★ (276)12 mi
44North Brothers Plumbing615.0★ (130)8 mi
45AK Plumbing615.0★ (70)4 mi
46High speed rooter & plumbing615.0★ (109)8 mi
47Merry Plumbing615.0★ (652)18 mi
48J's Plumbing615.0★ (207)12 mi
49Plumbing Concepts, Inc.614.9★ (442)15 mi
50Ramco Plumbing Heating & Air615.0★ (262)13 mi

How we ranked emergency plumbers in Diamond Bar

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 plumbers are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

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 from
Reputation15%Google star rating, adjusted for how many reviews back it
Credentials15%Active state license, bond and workers’ comp on file
Review volume10%Number of Google reviews, compared with the most-reviewed business on the list
Recency5%Share of reviews from the last 12 months
Availability15%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%How clearly the business does this trade (its Google category and name)
Proximity5%Based in the city scores highest, less the farther away it is
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodically
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there are

Emergency plumbers in Diamond Bar: questions

Which plumbers in Diamond Bar are open 24/7?

25 on this list post 24/7 hours, including Rooter Hero Plumbing & Air of San Gabriel Valley, Rooter Hero Plumbing & Air, Barker and Sons Plumbing & Rooter, Top Notch Plumbing Inc. and Option One Plumbing.

Who is ranked #1 for emergency plumbing in Diamond Bar, CA?

Rooter Hero Plumbing & Air of San Gabriel Valley is #1, with a CR Score of 65 out of 100 on emergency weights.

How are emergency plumbers in Diamond Bar ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 plumbers are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

What should I do before the plumber arrives?

Burst pipe or major leak: shut off the main water valve first. If water reaches outlets or the panel, stay clear and call 911.

How many emergency plumbers here list a phone number?

25 of the 25 businesses ranked in full list a phone number. Tap Call to dial it.

Update log for Diamond Bar

  1. October 2026: CR Scores recalculated for 1,282 plumbers serving Diamond Bar.
  2. October 2026: 15 duplicate listings merged.

More emergency and plumbing pages