Top Picks · Ontario
Best Plumbers in Ontario, CA
Rated and reviewed by real customers. Compare prices, read reviews, and call the top pros near you — for free.
As of June 2026, RatingsNearMe ranks 15 plumbers in Ontario, CA by the RNM Score — a 0–100 rating built from Google ratings, review volume, sentiment, and profile completeness. The top-ranked is AYS Plumbing & Rooter with a 4.9-star rating from 1,756 Google reviews and an RNM Score of 98/100. Also in the top tier: All Pro Cooling, Heating, Plumbing & Electrical and Option One Plumbing. The average rating across all listed plumbers in Ontario is 4.9 stars from 1,194 reviews per business on average.
Plumbing repairs in Ontario average $150–$500 for common fixes. Emergency calls and major work (sewer line, water heater) run $500–$3,000+.
Rankings updated June 9, 2026 · RNM Score = ratings (35%), review volume (30%), sentiment (20%), completeness (10%), availability (5%) · Not paid placement.
Plumbers in Ontario, CA provide a range of services including residential and commercial plumbing repairs, installations, and maintenance. Consumers should look for licensed, insured plumbers with experience serving the local Ontario area.
- ✓Residential and commercial plumbing services
- ✓Licensed and insured plumbers
- ✓Experienced in serving the Ontario, CA area
Best Overall
Trinity Plumbing LLC
Trinity Plumbing LLC stands out as the top-ranked plumber in Ontario, CA, due to its consistent high ratings and strong reputation for reliable service.
Most Reviewed
Monkey Wrench Plumbing, Heating, Air & Electric
A high review count indicates broad customer experience and trust, making Monkey Wrench a proven choice for many homeowners.
When choosing a plumber in Ontario, compare both overall rating and review volume to gauge reliability, and always ask for a written estimate before work begins.
How to Choose a Plumber in Ontario
What to look for
- • Licensed and insured plumber
- • Positive reviews and references
- • Upfront pricing and detailed estimates
- • Prompt response and availability
Questions to ask
- • Are you licensed and insured to work in Ontario, CA?
- • How long have you been in business?
- • Can you provide references from past customers?
- • How do you calculate your pricing?
Red flags
- ⚠ Unwillingness to provide license or insurance information
- ⚠ Negative reviews or lack of references
- ⚠ Vague or unclear pricing structure
- ⚠ Unavailability or long response times
In Ontario, CA, plumbers are required to be licensed by the Contractor State License Board (CSLB) and carry liability insurance. It's important to verify a plumber's credentials and insurance coverage before hiring.
Local Market Snapshot
15
Businesses listed
4.9★
Avg rating
1,194
Avg reviews
Jun 9, 2026
Last updated
Top Rated Plumbers
Plumbers Rankings in Ontario, CA
| # | Business | Rating | Reviews |
|---|---|---|---|
| #1 | AYS Plumbing & Rooter260 N Corporate Way, Upland, CA 91786, USA | 4.9★ | 1,756 |
| #2 | All Pro Cooling, Heating, Plumbing & Electrical2311 E Locust St, Ontario, CA 91761, USA | 4.8★ | 8,049 |
| #3 | Option One Plumbing10722 Arrow Route STE 602, Rancho Cucamonga, CA 91730, USA | 4.8★ | 3,016 |
| #4 | Prime Ontario Plumbing Solutions400 Ontario Center, Ontario, CA 91764, USA | 4.8★ | 16 |
| #5 | AMZ Plumbing Inc2125 S Hellman Ave N, Ontario, CA 91761, USA | 5.0★ | 53 |
| #6 | Monkey Wrench Plumbing, Heating, Air & Electric3200 E Guasti Rd Suite 100-G, Ontario, CA 91761, USA | 5.0★ | 117 |
| #7 | Royalty Plumbing and Drain3200 E Guasti Rd Suite 100, Ontario, CA 91761, USA | 5.0★ | 450 |
| #8 | High speed rooter & plumbing10709 Vernon Ave, Ontario, CA 91762, USA | 5.0★ | 301 |
| #9 | Hometown Plumbing Services615 N Euclid Ave suite 843, Ontario, CA 91762, USA | 5.0★ | 40 |
| #10 | Scott McLeod Plumbing, Inc.8222 Foothill Blvd, Rancho Cucamonga, CA 91730, USA | 4.9★ | 768 |
Ranked by verified ratings & review volume · Data from Google Business listings · Updated June 2026
All Plumbers in Ontario
400 Ontario Center, Ontario, CA 91764, USA
2125 S Hellman Ave N, Ontario, CA 91761, USA
3200 E Guasti Rd Suite 100-G, Ontario, CA 91761, USA
3200 E Guasti Rd Suite 100, Ontario, CA 91761, USA
10709 Vernon Ave, Ontario, CA 91762, USA
615 N Euclid Ave suite 843, Ontario, CA 91762, USA
8222 Foothill Blvd, Rancho Cucamonga, CA 91730, USA
10970 Arrow Route #104, Rancho Cucamonga, CA 91730, USA
1131 W 6th St Ste 209, Ontario, CA 91762, USA
9431 Haven Ave #100, Rancho Cucamonga, CA 91730, USA
8400 Maple Pl #107, Rancho Cucamonga, CA 91730, USA
5623 E Arrow Hwy, Montclair, CA 91763, USA
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Plumbers in Ontario, CA — Compared
| # | Business | RNM Score | Rating | Reviews |
|---|---|---|---|---|
| 1 | AYS Plumbing & Rooter | 98/100 | 4.9 ★ | 1,756 |
| 2 | All Pro Cooling, Heating, Plumbing & Electrical | 97/100 | 4.8 ★ | 8,049 |
| 3 | Option One Plumbing | 97/100 | 4.8 ★ | 3,016 |
| 4 | Prime Ontario Plumbing Solutions | 82/100 | 4.8 ★ | 16 |
| 5 | AMZ Plumbing Inc | 92/100 | 5.0 ★ | 53 |
| 6 | Monkey Wrench Plumbing, Heating, Air & Electric | 96/100 | 5.0 ★ | 117 |
| 7 | Royalty Plumbing and Drain | 100/100 | 5.0 ★ | 450 |
| 8 | High speed rooter & plumbing | 100/100 | 5.0 ★ | 301 |
| 9 | Hometown Plumbing Services | 90/100 | 5.0 ★ | 40 |
| 10 | Scott McLeod Plumbing, Inc. | 98/100 | 4.9 ★ | 768 |
Ranked by RatingsNearMe Score · ratings (35%), review volume (30%), sentiment (20%), completeness (10%), availability (5%) · June 2026
Frequently Asked Questions — Plumbers in Ontario
How do I find the best plumbers in Ontario?
Look for businesses with 4.5+ stars, 50+ verified reviews, proper licensing and insurance, and transparent pricing. The top-ranked plumbers in Ontario on this page are scored by our algorithm that weighs ratings, review count, and profile completeness.
Are plumbers in Ontario licensed and insured?
Licensing requirements vary by trade and state. For most home service contractors, CA requires both a state license and liability insurance. Always ask any contractor for proof of current insurance and a copy of their license number before work begins — you can verify most licenses on your state licensing board's website.
How much do plumbers charge in Ontario, CA?
Prices vary by scope, materials, and contractor experience. Use the free quote form on this page to request estimates from multiple local pros simultaneously. Getting 3+ quotes is the single most effective way to avoid overpaying.
What should I look for when hiring a plumbers in Ontario?
Verify licensing and insurance, read recent reviews on multiple platforms, ask for a written estimate before work starts, confirm they pull permits when required, and check references from recent local projects. Featured businesses on this page are ranked by verified ratings and review quality.
How are the plumbers on this page ranked?
Rankings use a transparent algorithm: star rating (35%), review volume (30%), customer sentiment (20%), profile completeness (10%), and availability (5%). Featured Partner listings have paid for enhanced visibility but must still earn their position through real customer reviews — sponsored listings are clearly labeled.
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How Rankings Work on This Page
Every plumbers on RatingsNearMe is scored transparently: star rating (35%), review volume (30%), customer sentiment (20%), profile completeness (10%), and availability (5%). Businesses labeled exclusive or premium are Featured Partners — they have paid for enhanced visibility but must still rank through real customer reviews. We cap sponsored boosts so bad businesses can never buy the top spot.
Editorial notice: Ratings are based on publicly available data from Google Business listings. Consumers should independently verify licensing, insurance, and credentials before hiring any service provider. Last updated: June 9, 2026.
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