Thompsons Plumbing Supply is always my go to for plumbing supplies. The staff is highly knowledgeable and always gives the best advice. They have been so helpful during our buildout for our boba shop and now helping out with advice for our swimming pool build. read more

I'm not a contractor, just a local homeowner in search of a replacement part for our upstairs toilet. Unfortunately, Lowe's did not have the part I needed. I decided to try Thompson Plumbing. Unfortunately, the service rep (will get his name later today) looked at a photo of the replacement part and started laughing. He went on to tell me that I got what I paid for - a cheap a** city give away water conservation toilet that aren't worth a s***. He went on to tell me that I will need to buy a new toilet. His final comment was that I need to buy a toilet like the rest of the people. All of this was done in front of other employees and about 4 customers who all had a laugh at my expense. I went home and got online with Home Depot and I can pick up the part tomorrow. Extremely rude and unprofessional. read more

The best items and service. And the employees know there business! If you need to find a hard to find part or need some direction on how to do the job they can help you. read more

If I could leave a 0 star i definitely do it. Save your money and stay away this ridiculous company!!! You can't return the stuffs that you bought even though is unopened ! This is what i been told by the salesman this morning!! I bought a $500 valve end up is the gasket problem. You can tell me may be try to get the gasket first instead buy the whole thing!!! And i cant return it i got jacked $500 just like that !!! Ridiculous company worst customer service ever !!! read more

They have what you need and you don't have to search for it like you do at the big box stores. Also, the quality of the material you get from Thompson's is much better. read more

They have the parts and the knowledge to help you get your job done right and on budget. Family owned and run. I've been a customer for over 15 years and will keep going here. read more

Great place to find products that are not at home depot or lowes. They are a professional supply house. Safe place and friendly staff. read more

One stars because I had to return the part which was not helpful did not. serve the purpose which I picked up for from Thompson pluming with in 24hr i came to return the item they told me they charge restocking fee the casher or service person said he is following rules and does not make the rules. Strange how people run business these days and charging not 10% but 25 % restocking fee. To put an item back on the shelf that was never unwrapped!! Thats highway robbery They must have made millions in restocking fee. I am not a plumber or contactor. MAKE SURE YOU GOT THE RIGHT PART OR YOU PAY 25% RESTOCKING FEE. THEY SHOULD HAVE BIG SIGN 25% RESTOCKING FEE IN THE STORE VISABLE. GOOD LUCK read more

Solid people. Knows their shit & if they do not will point you in the right direction.

Thompson plumbing supply is the best plumbing supply store in the upland area. Hardly ever any backed up lines and are able to get material quickly. They also have a large variety of parts to choose what ever it is you are looking for can be found here read more

Spoke with Nick and showed him the broken geriatric part I took from under the sink. Said he hadn't seen that part but once in his plus 30 years working there (almost like seeing a 2-headed snake). Incredibly, he went back and found the piece I needed, saving me $475 from having a plumber come and completely gutting and replacing the pipes under the sink. Friendly and helpful service. Would definitely return for advise and parts. read more

If you're a homeowner/do it yourself person, do yourself and them a favor and stick to Lowe's, Home Depot or Amazon. They mainly cater to the plumbing pros in the area and don't have the time, energy or patience to help find a hard to get part. I'm ok with that by the way, I get it. I just hope I can save someone the time and effort going into this place thinking they will find what they need. read more

I went to Home Depot to buy a shower valve to replace our broken one and the part was so old that the associate referred me to Thompson Plumbing Supply. I went to Thompson and showed the sales associate a picture of the valve that I took with my iPhone. The sales associate found exactly what I needed in less than 5 minutes and even made sure that I bought some plumber's grease! Everything fit perfectly and our once leaky shower is back to normal. read more

Heath, nick, Justin, Eric and Sean. Go the extra mile to get the materials you need, when you need and where you need. Super service. Also very friendly and polite. And I'm so thankful for them. read more

3 stars because I got my lid .. would have been a 5 star if Justin would have followed through . Guess my little toilet lid did not make their company any money so we were low on the priority list . Strange how people run business these days ..oh and 25 % restocking fee. To put an item back on the shelf that was never wrapped !! Thats highway robbery read more

Very friendly and great service. Even kind enough to help us change our flat! Ps: don't hit the curb coming in ;) read more

Needed a Delta shower mixing valve cartridge. Went to Home Depot but they only had generic brands on display. The associate said he was sure there were Delta brands up top and got a ladder to check. He showed me what Delta product they had but it didn't look exactly like the old, worn one I had brought for reference. He suggested Thompson's since they carried specialty parts. BTW, the Delta item was $37.98. Went to Thompson's and told them what I needed. The employee brought out the exact one that Home Depot showed me. I told him it doesn't look exact. He said it was the exact model I need, the company had modified it slightly but it would work. I asked how much knowing the Home Depot price. They wanted $68 for the same exact part. DOUBLE! It's not even a specialty part. I told him the Home Depot price but he was indifferent to say the least. I said forget it and snapped a pic of the product before deciding to go to Lowe's which was a couple miles away. Found the exact same item at Lowe's for the same price as Home Depot. I made doubly sure it was right with the pic I took. Stuck to the back of the computer monitor was a piece of paper that had some convoluted return policy. From what I could understand, you had to ask for "permission" to return a purchase which made no sense. Glad I didn't buy anything from them. These guys might be knowledgeable but they're markup is insulting. I'll never go back there for a common plumbing product that I can get for half the price at the big box stores. A couple extra bucks would be understandable but $30 more? I could have literally purchased two of these for the Thompson's price. Please! read more

Can we talk about the customer service! By far the worst customer experience I've ever experienced we walked in looking for a specific piece the guy came back with a box and when I asked how would I know it's the right part that I'm looking for (keep in mind I had the use old part in my hand) he said he didn't (he couldn't even open the box to show me to make sure it was the right part) on top of that his attitude was horrible looks like he was ready to have lunch since his meal was in front of him I felt rush and no solution was given I am pissed! If he was ready to have lunch he shouldn't of been in the front dealing with customers! I WILL NEVER GO BACK THERE AGAIN! read more

Not open to public. The owner of this place DOES NOT make his own decisions, he is at the mercy of the manufactures that allow him to carry his products. The local Lowe's and Home depot need to stop referring people to this old man's place of business. He will not sell you certain items because he says his manufactures only allow him to sell to licensed contractors. This is not true, nor is it a state or Federal law. Go to Ferguson in Ontario. Better prices and they won't make you listen to an insufferable septuagenarian dotard owner. www.ferguson.com The picture shows my receipt for a Gastite product that the old wise man says he can't sell to a person like me. I guess Fersuson should be shut down? read more

Thompson Plumbing Supply - Gastite product receipt. Gastite also advertises publicly. - Kitchen Supplies Near Me - Upland, California

I really like having the option to give my business to a small and independent company like this. Great service and I always get tips for the project I'm working on. read more

I have been there quite a few times by some really cool stuff The landscape my house in the ghetto of Fontana I am just so happy when I'm there very cool stuff customer service's great And it's reasonably priced read more

Went to Home Depot for a part they did not have but was referred to this place here came almost to the very last 10 minutes before closing guy took his time to explain to me couldn't find my piece online but it's a very best to help me fix the problem temporarily as well as referred me to a good plumber with good prices read more

Have been here a few times. They do not like to deal with home owners that ask questions. They would rather deal with plumbing contractors that know exactly the parts they need, and purchase in volume. read more

Very good customer service. Saved me a lot of money giving me a correct details to fix my leaking sink .

Very disappointed with how they treat non contractor (general public) customers. I bought a flapper for my toilet, and was told it would work. When I got home and tested it, it was not the right size. I dried off the flapper and repackaged like new. When I tried to return for a refund, they said I was out of luck since they consider it used now. This was literally 45 minutes after I had purchased. They were very rude and refused to even discuss it. The owner was especially dismissive and rude. Terrible customer service. Beware if you are not a contractor, and go somewhere where good customer service is practiced. read more

Great service and they have older parts. I went to five different supply houses looking for a Gerber shower valve. Thompson's was the only place that had it. read more

Man this place is awesome. I was looking for a flare tailpiece for my sink, and first went to home depot. They had the piece but said I would have to cut it to size at home. I decided to give this place a try after googling it. I was helped right away, and the guy that helped me was able to get me the pieces, and cut it to size for me. When I got home it took me 2 minutes to install it! I need to switch more of the pieces to my sink, so i'm definitely going back here again! Great job guys. read more

Went in this supply place asking for specific product..was told he would make a call and call me. NEVER CALLED ME! 3 weeks past I called asking about a tankless water heater.. He gave me price of $1,060. B4 tax. Online price is $550 delivered.WOW read more

I have been shopping here forever. The level of service and knowledge is amazing. Heath, Nick, and Eric are my automatic go to guys! Thanks again for everything. read more

Real plumbing suppy store, with quality parts and friendly, expert staff. I'll go back.

Nick helped me out. Very straight forward and honest. With advice, expertise, and honesty, that equates to integrity and value- a winning combo. No need to go to Lowe's or Home Depot. read more