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ContractorsRanked

Best Plumbers in Monrovia, CA (2026)

1,328 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Monrovia: Western Rooter & Plumbing, CR Score 94/100; 4.9★ from 1,562 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Merry Plumbing, posts 24/7 hours; ranked #2 of 1,328.

  3. 20

    Most-reviewed: Barker and Sons Plumbing & Rooter, 3,896 Google reviews at 4.8★, the most of 1,328 ranked; ranked #20.

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

1,328 Monrovia plumbers are ranked here by CR Score, from 8 published factors. 689 are open 24/7, 1,099 open Saturdays and 877 open Sundays, based on posted hours. The median Google rating is 4.9★ across 1,328 rated businesses.

Top 10 plumbers in Monrovia at a glance

Top 10 plumbers in Monrovia at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Western Rooter & Plumbing944.9★ (1,562)Arcadia, 2 mi away24/7Overall
2Merry Plumbing925.0★ (652)San Marino, 6 mi away24/7Emergencies
3Drainflow Solutions & Plumbing925.0★ (276)Duarte, 2 mi away24/7—
4Hassle Free Plumbing914.9★ (266)Monrovia24/7—
5Top Notch Plumbing Inc.915.0★ (515)Covina, 8 mi away24/7—
6Roto-Rooter Plumbing & Water Cleanup914.9★ (736)Pasadena, 8 mi away24/7—
7Drain Great Plumbing Services905.0★ (94)Monrovia24/7—
8High Speed Plumbing of Arcadia904.9★ (182)Arcadia, 2 mi away24/7—
9Rooter Hero Plumbing & Air904.9★ (1,637)Pomona, 16 mi away24/7—
10Roto-Rooter Plumbing & Water Cleanup904.8★ (1,128)Alhambra, 10 mi away24/7—

The 1,328 best plumbers in Monrovia, 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.

  2. #2 Merry Plumbing

    Based in San Marino, 6 mi away

    92/100CR Score

    Ranked #2 because of its Google rating and availability: 5.0★ from 652 Google reviews, open 24/7.

    • 5.0★ from 652 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1465 San Marino Ave, San Marino, CA 91108
    View profile for Merry Plumbing(626) 414-5583

  25. #25 JB Plumbing

    Based in San Dimas, 11 mi away

    88/100CR Score

    Ranked #25 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 1,328 ranked plumbers here; the rest are on their profiles.

plumbers in Monrovia, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Katty's Plumbing Arcadia885.0★ (41)2 mi
27Mr. Rooter Plumbing of Long Beach884.9★ (1,140)21 mi
28Roto-Rooter Plumbing & Water Cleanup884.9★ (417)15 mi
29Service Squad884.9★ (131)8 mi
30I Love Sewers Rooter And Plumbing Sewer Specialties Inc884.9★ (200)11 mi
31JG Plumbing & Rooter Inc885.0★ (77)7 mi
32LionHeart Plumbing Glendora884.9★ (39)1 mi
33SWE Sewer Solutions Construction & Engineering884.9★ (120)8 mi
34Water Heaters Only, Inc.884.9★ (720)18 mi
35PDS Plumbing and Air885.0★ (471)19 mi
36Isaac & Sons Plumbing San Dimas885.0★ (124)11 mi
37John's Plumbing & Drain Services884.9★ (383)15 mi
38Olson Superior Plumbing Santa Fe Springs884.9★ (272)13 mi
39EZ Sewers Rooter and Plumbing885.0★ (130)12 mi
40Goodwill Plumbing & Drain Inc885.0★ (27)2 mi
41High Speed Plumbing884.8★ (542)15 mi
42Biard & Crockett Plumbing, Heating, and Air Conditioning884.9★ (1,715)25 mi
43Martinez Plumbing884.9★ (53)5 mi
44Option One Plumbing884.8★ (3,017)25 mi
45Harrison Brothers Plumbing884.8★ (143)4 mi
46Redhead Rooter Plumbing Drain Cleaning & Hydrojetting875.0★ (302)19 mi
47Roto-Rooter Plumbing & Water Cleanup874.9★ (556)19 mi
48Service Lion Plumbing Heating Air Electric874.7★ (1,173)17 mi
49The Rooter Company874.9★ (350)17 mi
50A-1 Total Service Plumbing874.9★ (1,494)12 mi

Also serving Monrovia

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 Monrovia
BusinessGoogle ratingDistance
ABC Plumbing & Heating Co4.5★ (2)14 mi
All Rooter Solutions5.0★ (2)8 mi
Count-on Plumbing5.0★ (2)8 mi
Courtesy Plumbing4.8★ (387)8 mi
Dynamite Plumbing5.0★ (2)9 mi
Hydro Backflow5.0★ (2)8 mi
Jerez Plumbing | Emergency Plumber, Hydrojetting, Drain Cleaning, and Tankless Water Heater Repair in La Puente, CA5.0★ (92)8 mi
Jose Cruz Plumbing Heating Electrical5.0★ (2)12 mi
Leo Plumbing Services5.0★ (2)12 mi
Mora Rooter5.0★ (2)12 mi
North Brothers Plumbing5.0★ (130)6 mi
Pershing Plumbing - Pasadena Plumbing Company5.0★ (2)8 mi
Plumber XP5.0★ (258)16 mi
Plumbing Monrovia5.0★ (1)In Monrovia
Pre Cast Drain Box5.0★ (2)6 mi
Ramirez Handyman Service5.0★ (2)13 mi
Showtime-Vince Ruiz Plumbing4.5★ (2)8 mi
Tankless Water heater Repair & Plumbing5.0★ (2)2 mi
The Hale Corporation4.0★ (2)In Monrovia
The Sewer Company4.9★ (215)9 mi

How much do plumbers cost in Monrovia?

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

How much do plumbers cost in Monrovia?
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 Monrovia plumbers

We scored 1,328 Monrovia 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 Monrovia 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 Monrovia: frequently asked questions

Who is the best plumber in Monrovia?

By CR Score, the highest-ranked plumber in Monrovia, CA is Western Rooter & Plumbing with a CR Score of 94/100. It has 4.9★ from 1,562 Google reviews. It is open 24/7. Merry Plumbing (#2) and Drainflow Solutions & Plumbing (#3) follow. We ranked 1,328 plumbers on 8 factors, last updated October 22, 2026.

How many plumbers are there in Monrovia?

ContractorsRanked ranks 1,328 plumbers serving Monrovia, CA. 3 of them are based in Monrovia; 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 Monrovia are open 24/7?

689 ranked plumbers in Monrovia post 24/7 hours. The highest-ranked are Western Rooter & Plumbing (#1), Merry Plumbing (#2) and Drainflow Solutions & Plumbing (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which plumbers in Monrovia work on weekends?

1,099 of 1,328 ranked plumbers post Saturday hours and 877 post Sunday hours. The highest-ranked open Saturdays are Western Rooter & Plumbing (#1), Merry Plumbing (#2) and Drainflow Solutions & Plumbing (#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 Monrovia?

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 Monrovia. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Monrovia plumbers have?

The median Google rating among 1,328 rated plumbers in Monrovia is 4.9★, with a median of 21 reviews. Barker and Sons Plumbing & Rooter has the most, 3,896 reviews, and ranks #20. 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 Monrovia

  1. October 2026: CR Scores recalculated for 1,328 plumbers serving Monrovia.
  2. October 2026: 12 duplicate listings merged.

More plumbers and Monrovia pages

Other trades in Monrovia