A Professional Engineer on every job, that’s the de Jong Excavation difference.
Working in New York’s Adirondack Park and Great Sacandaga Lake regions.
Based in Broadalbin and serving New York State’s Fulton, Montgomery, and Saratoga counties, as well as gateway communities in the Adirondack Park and the Great Sacandaga Lake region, we bring specialized knowledge of seasonal camps, lakefront properties, unique soils, steep lots, tight access sites, and strict environmental considerations.
Built on decades of experience.
At de Jong Excavation, every project is backed by professional engineering precision from start to finish. Owned and operated by Professional Engineer Mark de Jong, we deliver excavation, system installation, and site development solutions built on accuracy, reliability, and decades of hands-on experience.
Septic Systems are our specialty.
Partnering seamlessly with our engineering company Makron Engineering PLLC, we handle the entire process from site evaluation and soil testing to design, permitting, and full installation. Whether it’s a new system, a replacement tank or leach field, or a complex lakefront or Adirondack Park project, we deliver engineered solutions built for long-term performance, code compliance, and the unique conditions of each property.
A licensed Professional Engineer is on-site for every project — ensuring compliance, quality control, and engineering-level problem solving.
A seamless, one-stop process when paired with Makron Engineering PLLC — from soil testing, design, and permitting to complete installation.
Local expertise in camp lots, shoreline sites, APA regulations and municipal codes.
Honest communication, fair pricing, and dependable timelines from a locally owned and operated business.
Long-term solutions designed and installed with precision — not shortcuts.
Our Services
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We provide engineered excavation solutions for homes, camps, additions, and new construction sites. From the first bucket of soil to the final grade, every step is overseen by a Professional Engineer to ensure proper elevations, drainage paths, and structural support.
Our excavation services include foundation digs, grading and leveling, utility trenches, building pads, access roads, and preparation for outbuildings or garages.
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As a combined engineering + excavation team, we offer a seamless start-to-finish septic system process. Makron Engineering handles all site evaluations, soil testing, engineering, and permitting, while de Jong Excavation performs the full installation with precise adherence to the design.
We specialize in challenging sites, including lakefront properties, seasonal camps, steep slopes, small lots, and Adirondack Park regulated areas.
Systems include conventional septic, alternative treatment systems, raised/engineered beds, tank and distribution box replacements, leach fields, and complete system upgrades.
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Whether constructing a new driveway or restoring an existing one, we design and install gravel surfaces that shed water properly and remain durable over time.
Services include new driveway construction, resurfacing, parking pads, culvert installation, ditching, swales, and slope correction. -
Seasonal camp properties and lakefront sites require a unique understanding of the terrain, access limitations, soils, and APA/municipal requirements — and that’s where we excel.
We provide selective clearing, access road construction, foundation excavation, septic design/installation, shoreline-friendly drainage solutions, and site development tailored to tight or steep lots.
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Proper drainage is essential to protecting foundations, lawns, driveways, shoreline structures, and septic systems. We assess how water moves across your property and install engineered solutions that control runoff and prevent erosion.
Our services include curtain drains, French drains, swales, foundation drains, sump discharge lines, erosion-control matting, and slope stabilization. These systems are especially important for lakefront properties, hillside lots, and areas with chronically wet ground.
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We prepare properties safely and efficiently for construction, utilities, and site improvements.
Our clearing and trenching services include tree and brush removal, selective cuts, stump removal, utility line trenches (water, sewer, electric), and path creation for new structures or system installations.
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In addition to excavation and site work, de Jong Excavation offers convenient delivery of farm-fresh screened topsoil and a full selection of stone and sand products sourced from trusted local pits.
We provide two delivery load sizes — 8–9 ton or 20 ton — to accommodate projects of any scale.
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As part of our land clearing services, we offer homeowners the unique option to turn removed trees into usable, custom-sized lumber. After on-site cutting/clearing and removal from your property, we haul the trees to our farm and process them in our professional wood shop — including milling, cutting, and drying the wood to eliminate insects and bacteria. The result is a clean, stable, professionally milled lumber that’s ready for building projects, furniture, and more.
Reach out today to schedule your next project!
Give us a call or email your project details to receive an estimate.
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Could not be happier...
“We could not be happier with Mark's work. He is a great communicator, he took the time and care to be sure we understood the proposal. He went above and beyond and even solved a longstanding basement drainage mystery savings us thousands down the road. He was on time, did great work and was true to his estimated costs. We will not hesitate to call on him again.” -Nancy
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We are beyond pleased...
“We were looking to replace our septic system, we contacted De Jong Excavation LLC/Makron Engineering. Mark who is a Professional Engineer explained, in full detail, the whole process from the design, permit and installation of our septic system. Since we are in an environmentally sensitive area, this was important to us. After this conversation we knew immediately that this was the company we were going with. We also loved the convenience of dealing with one Individual, Mark, who took care of the whole process.
He arrived as stated and immediately started the mass project. Finishing in a timely manner, landscaping included.
We are beyond please with his job and confident that he stands by his work.
You will not regret working with Mark, he's the best. Thank you again for a job well done.” -Bernadette -
He made sure we were happy with the entire process...
“Mark went above and beyond with our leaching field replacement project. I couldn't ask for a better company to work on our septic system. Mark was very professional, on time, hardworking and made sure that we were happy with the entire process.” - Amar