🔧 Official Rankings
10 Best Plumbers in Ontario, CA (September 2026)
We compared 10 plumbers serving Ontario and San Bernardino County, California, and ranked the top providers by verified reviews, ratings, and local reputation — 13,644 customer reviews in all.
The 10 listed below hold an average rating of 4.9 out of 5, led by High speed rooter & plumbing. Updated for September 2026.
- Plumbers ranked
- 10
- Average rating
- 4.9★
- Reviews analyzed
- 13,644
- Area code
- 909
⭐ 5.0 · 549 reviews
10709 Vernon Ave, Ontario, CA 91762
⭐ 5.0 · 513 reviews
3200 E Guasti Rd Ste 100, Ontario, CA 91761
⭐ 5.0 · 130 reviews
3200 E Guasti Rd Ste 100-G, Ontario, CA 91761
⭐ 4.9 · 8249 reviews
9447 London Way #102, Rancho Cucamonga, CA 91730
⭐ 4.9 · 1784 reviews
260 N Corporate Way, Upland, CA 91786
⭐ 4.9 · 992 reviews
5623 E Arrow Hwy, Montclair, CA 91763
⭐ 4.9 · 792 reviews
8222 Foothill Blvd, Rancho Cucamonga, CA 91730
⭐ 4.9 · 335 reviews
290 N Benson Ave #1, Upland, CA 91786
Plumbers listed here serve Ontario, San Bernardino County, and nearby ZIP codes including 91758, 91761, 91762, 91764, 91798.