Best Water Filtration System Repair in Washington DC

Received four quotes for three major home projects: A complete master bathroom remodel, a new deck, and replacement of a drop ceiling with sheetrock and repair of a water-damaged wall in a guest bedroom.
The first three quotes were from high end remodelers. A friend recommended Allen Geoffrey's Handyman Services to us (she had just had her bathroom remodeled). Geoff and his crew (Mark and Brian) came out to survey the jobs. They spent more time with me going over what work we wanted and what our major concerns were. They suggested a comprehensive plan of attack from top to bottom. We were consulted at every step of each of the projects to ensure that our expectations and design elements were incorporated.
Their price quote came in thousands (yes, thousands) of dollars less than the three previous quotes. While they don't provide the design assistance of the high end contractors, they met us at a big box contractor store and helped us color-coordinate our design interests. They took care of ordering all the various pieces parts needed and got us a significant discount on materials.
First, they replaced the deck to install flashing (that the previous home owner neglected to do), that led to the water damage in the guest bedroom. The deck was brought up to code and revealed serious problems with the previous deck installation.
After the deck was done, the crew split off into two teams, one working on the master bathroom, the other, working on the guest bedroom.
The crew took care of hauling off all old materials and cleaned up after each day. The work was first-rate.
As with any major home project, unexpected/unforeseen problems arise. While removing the water-damaged sheetrock in the guest bedroom, major water damage was discovered to the exterior wall. Geoff gave me a very reasonable labor estimate to repair the wall. That wall is now the strongest in the house.
They show up when expected, every day, until the job is done.  They go beyond what is expected to ensure that the client is happy with the direction the project is headed.
I highly recommend these master plumbers. I guess my highest endorsement is that, when our kitchen cabinets come in, Geoff and his crew will be doing our complete kitchen remodel (again, coming in thousands of dollars less than the high-end contractors). If you need any work done to your home, give them a call. They will not disappoint you.
And, Geoff, Mark, & Brian, our new master bathroom looks and functions beyond our expectations. Thank you!

Had a problem with a Rheem water heater.  Called another vendor, supposedly certified to work on Rheem water heaters, but they were not able to solve the problem and get to the bottom of the issue.

Asked Drain Works to take a look at the water heater.  The plumber took his time, systematically worked through the system, and found an extremely small filter that was clogged.  After cleaning this out, the water heater (and I) were very happy again.

Had Drain Works do work previously, and found they had the same methodical, careful, and systematic approach that they used on the water heater.  For any issues in the future - will definitely call them again.

This place is fantastic. He completely remodeled a bathroom for me. He was quick, fairly priced, cleaned up thoroughly and was polite and respectful. The bathroom looks amazing!  I will definitely use again and would recommend to anyone!

Professional, courteous, and reasonably priced. I did not actually receive service from Lyons Plumbing, but during my quote request process, Dan the owner, was very forthright and responsive. The quote he provided was one of the more affordable ones as well as well explained.

Great company to work with. They went above and beyond to fix our plumbing issue. Bear was so nice and helpful -- definitely would recommend this company to other people!

Thanks again.

Great honest company.  Was quick to respond and did quality work.  Will definitely use them again and recommend them to everyone.

Pros - My call was answered during the weekend and my appointment was scheduled.

Pros - When the person finally showed, he took a picture of my leaky faucet to show me the problem.

Pro/Con - They charge about a 30% mark-up for their supplied hardware above off-the-shelf prices.

Cons - Person who took appointment didn't pass along to the dispatcher my message that we couldn't have work before 9:00 am.  I missed a 7:52 am call.  When I called back, I was told they were on other calls, and they'll get there when they get there.  Didn't get service until after 2:00.  And they were upset at me for calling to find out when I should expect someone.

Cons - Very, very expensive.  They quoted $619 to replace my (fairly basic) faucet or $452 to install if I bought the part.  I got Price Pfister faucet off the shelf, at Home Depot for $128, and HD installed for $125.  Installation took only 14 minutes. $253 is less than HALF of what Plumbing Doctor quoted.

And the $619 was their LOWEST price.  They had a tablet that had 4 price levels, with service contracts or something.

Bottom line is I believe $452 is too much for 15 minutes of work.  
$125 is more appropriate.

And why do they need what's essentially a 30% mark-up on a retail price?  I mean HD is making a profit off of the retail price, so Plumbing DR is making profit above retail.

I called Scott from Northern Plumbing based on the recommendation from an HVAC service.  He did a fantastic job.  He did some work on a hot water heater and bathroom sinks.  Reasonable prices (doesn't even charge to come out), very patient, and great at explaining problems and solutions.  Very detail oriented, polite, and easy to work with.  He's available 24 hours and on weekends.  I'll definitely use Scott again and recommend him to anyone in need of plumbing services.

I had a leak appearing on my dining room ceiling and called Mallick.  Remy Lopez came out and within 15 minutes he was able to determine the source and fixed the problem quickly.  I've always been impressed with the responsiveness, courtesy and expertise I've experienced with Mallick in the past, and Remy was no exception.  Highly recommended and reasonable priced to boot!