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Black Rock Underground LLC

Founded 2012 • With Angi since September 2012


(21) Verified Reviews


Black Rock Underground, LLC is the expert in trenchless sewer repair and #1 Local Sewer Services Company in all of the Portland, OR Metropolitan area. Black Rock Underground, LLC uses state of the art trenchless sewer equipment technology, highly experienced crews, and 24/7 dispatching center. We are able to provide affordable, fast and professional sewer services to our valued customers in all of Portland, Oregon Metro. Our advanced equipment and highly experienced crews can handle any size sewer repair jobs for home owners, commercial, industrial, and municipal customers. When you want the job done affordably, quickly, clean, and professionally just pick up the phone and call the experts at Black Rock Underground, LLC....

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Are you in need of sewer repair? Do you have standing water in your crawlspace, a soggy yard, wet basement, broken or clogged roof drains or driveway puddles? Do you need a new dry well, french drain or just some grading? Check out our website to see how we can help you or just give us a call. We can set up an appointment for a free estimate to give you a professional evaluation of your drainage needs. Drainage Masters will give you an effective plan of action, quality work and competitive prices. Our work comes with warranties that will be honored. Drainage Masters became a licensed general contractor in October 1996. In 2015, Seth Kenworthy became the sole owner and manager of Drainage Masters LLC. They are licensed, bonded and insured in both Oregon and Washington. Since the beginning of Drainage Masters in 1996, Seth has proven his ability to understand the often-complex technical details of solving drainage problems and of effectively and efficiently managing every project they do. Our service territory is primarily the Portland/Vancouver metro area but extends as far north as Chehalis, as far south as Salem and from the Cascades to the coast. Drainage Masters combines technical expertise, integrity, quality work, a strong customer service ethic, environmental consciousness and fair pricing to bring our customers the best contracting experience they can get. Our full service and quality work has resulted in many satisfied customers and welcome referrals. Not all drainage or water management projects are complicated. But whether they are or not, you can be sure that Drainage Masters can handle it. Their professional and courteous office staff will be happy to assist you in scheduling a free estimate and then follow up to schedule your project as quickly as possible. Drainage Masters is now offering full service sewer repair, give us a call today. Call Drainage Masters today!  

Thank you for you interest in Mt. hood septic. We offer septic system inspections, system repairs, Tank replacements, pump and float replacement and much more. Don't have a septic system? We can still help. We also offer lateral inspection for home owners and business, drain cleaning and repair and replacement of your sewer line. We and licensed bonded and insured through Oregon contractors board and Oregon department of environmental quality. We are nationally licensed certified inspectors and Oregon licensed DEQ installers and maintenance providers. With our high end equipment and professional staff there is no job to big or to small we can not accomplish for you in a timely manner.  

Verified Reviews

A few reviews for this pro...


It was excellent, they had the answer to any questions that I had. I was very impressed. They take an eye on safety. I could tell that everyone respected him as a ruler type of person.

Description of Work
They trench the floor in my basement.

Category excavators



It went well. The workers were good. They were prompt. I would tell a friend that they were competent and did a good job.

Description of Work
Black Rock Underground put in a new sewer line from the house to the sewer. They also decommissioned an underground cesspool.

Category drain pipe,sewer cleaning



A sewer inspection was required as part of the sale process of the home. The buyers inspection indicated that there was blockage just outside of the house trap, although he could not get the camera through to verify. Black Rock was able to pass his camera through to the main connection; some 70' in length. He gave me an accurate estimate and scheduled work that same week. The job was a bit more in...

Description of Work
New sewer line

Category drain pipe



I happened to be standing in my garage during an intense downpour, when I noticed a rain drain backing up and running down the driveway. Clearly I had a clog. I attempted to snake it with my 25 ft, but reached nothing. I tried again with 50 ft., but couldn't get past 35 ft. I rented a 100ft snake from Home Depot, but couldn't get much farther. I tried from another drain and did an obstruction, but...

Description of Work
Traced rain drain system around house and to street with video and sonic tracer. Found unusual blockage of cement, excavated, and replace pipe.

Category excavators,drain pipe



I made arrangements with Blackrock on June 16th to come by and inspect my sewer line and then develop a quote to repair it on June 19th between 6 and 6:30 am. They never showed up on the 19th. I called Cory and left a VM at 6:45 am that day and I never heard back. I sent a follow up email on June 29th and never heard back. I don't plan on using them at this point. I am really surprised they cannot...

Description of Work
Blackrock was supposed to inspect my sewer line and give me a quote to repair it.

Category drain pipe

Service Provider Response

(Member name removed), I sincerely appologize. This was not my intension to completely drop the ball on you. I won't get into details with you but, this last month has been very difficult due to some personal issues with my family which has taken up most of my time. I simply have not had the capacity to keep up with everything at this rate. Now that things in general has seemed to calm down, I am ...

    Services Offered

    Drain Pipe Video Inspection: Our professionally trained technicians are able to pinpoint problems with broken, cracked or collapsed drains or sewage lines that require repair or replacement. We make repairs right the first time. Saving you time and money. Trenchless drain pipe Repair & Replacement, Excavation, Land Clearing, Grading, Underground Utilities. Superior Results Without Digging. This no hassle, cost-effective means of pipeli

    Services Not Offered

    Landscaping, Irrigation

    General Information
    Free Estimates
    Payment Options
    Check, Visa, MasterCard, American Express, Discover, Financing Available
    Senior Discount
    Emergency Service