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24 contractors listed · 5 in Ontario · 18 open 24/7 · 22 open weekends · all 24 rated 4.5+
Data verified October 16, 2026
Listed for homeowners in and around Ontario, CA, these 24 companies cover plumbing work. Hours, license claims and free estimate offers come from each company's own website, so confirm them on the phone before you agree to a visit for something already running.
Of the 24 contractors we list here, 5 are in Ontario itself and 19 come from towns including Upland (4, 6 mi), Rancho Cucamonga (3, 6 mi) and Corona (3, 13 mi). The contractors on this page are rated from 4.7 to 5.0 across 14,246 reviews; 20 have 50 or more reviews. When customers rate these contractors on specific qualities, they most often praise professionalism (91%), responsiveness (82%) and quality (79%). 18 are open around the clock; 22 are open on Saturdays and 20 on Sundays. The services the contractors on this page list most often on their websites are water heater (5), drain cleaning (4), hydro jetting (4), sewer camera inspection (4) and sewer line repair (3). 15 show a license on their websites; 1 lists staff certifications (NATE) and 9 have a BBB rating of A or A+. 13 have ten or more years of experience, the longest 37 years. 18 offer emergency call-outs; 8 offer financing or payment plans; 11 give free estimates; 14 are family- or locally-owned and 9 list coupons or special offers. We count these figures across the contractors on this page; distances are straight-line, and hours and prices change, so confirm the details with the contractor before you book.
15 of the 24 plumbing listings here show a license on their websites. Ask for the number, take it to the board that issued it and confirm it is current and actually covers plumbing. A company that does not say so may still hold a license, so ask on the phone and write the number down.
