Service Area · Front Range / Palmer Divide
Senior-led septic, excavation, driveways, water storage, and custom building across Douglas County — Front Range / Palmer Divide at 5,800–7,300 ft — with the hard mountain site work handled in-house.
We do more than dig a hole and drop in a tank.
Tri-Lakes Contracting is a licensed septic installer, excavation contractor, and custom home builder working throughout Douglas County. Site work and septic permitting are the critical first steps before you can even break ground on a build — and they’re exactly what we handle, start to finish.
Because we hold the septic, driveway, and building sides in-house, we bundle them into one path instead of stitching together three separate contractors: soil testing and engineered design, excavation and grading, the septic system, water storage, and the home itself — one crew, one point of contact, on your schedule.
We know Douglas County terrain inside and out — rolling Palmer Divide grassland, gulches, and scrub-oak foothills. Whether your property is in Castle Rock, Parker, Larkspur and Sedalia, we deliver site work built for Front Range / Palmer Divide conditions and permitted under Douglas County (Tri-County Health successor agency) and Colorado’s Regulation 43.
What we handle in Douglas County
We excavate profile test pits, work with licensed engineers on the soils report and site plan, and lay out the drain field, tank, and setbacks — the design your Douglas County (Tri-County Health successor agency) permit stands on.
Full onsite wastewater systems — conventional, pressure-dosed, and advanced-treatment — installed for Front Range / Palmer Divide ground and Douglas County (Tri-County Health successor agency) review.
Access, building pad, utilities, and all-weather driveways cut for Douglas County — rolling Palmer Divide grassland, gulches, and scrub-oak foothills.
Buried cisterns and fire-suppression storage for lots without a reliable well, or where the county requires stored water on site.
From a build-ready design or your own plans, we take a raw Douglas County lot through to a finished, permitted home.
Before you buy or build, a clear read on what the lot can support — soil, slope, setbacks, water, and the permit path.
Local details by service
Gravel construction, repairs, swales and culverts in Douglas County →
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What we don’t do
We don’t design or stamp septic systems ourselves — that work is always completed by a licensed engineer. But we work closely with our engineering partners so you receive a complete, permit-ready package that passes Douglas County (Tri-County Health successor agency) review the first time, without the back-and-forth that stalls a Douglas County build.
Already have engineered septic or OWTS plans? Upload the PDF for an instant Colorado installation estimate, then have Tri-Lakes, a licensed Colorado OWTS installer, price and build the system.
Where we work in Douglas County
We serve Castle Rock, Parker, Larkspur and Sedalia and the surrounding Front Range / Palmer Divide high country, out from Castle Rock. At 5,800–7,300 ft, Douglas County brings rolling Palmer Divide grassland, gulches, and scrub-oak foothills — conditions our crews work in every week, not once a season.
Douglas County — questions
Yes. We excavate the soil test pits, coordinate the engineered design with a licensed engineer, and hand you a permit-ready package for Douglas County (Tri-County Health successor agency) under Colorado Regulation 43. On Front Range / Palmer Divide ground — rolling Palmer Divide grassland, gulches, and scrub-oak foothills — that soil evaluation is what the whole system is designed from.
That’s our model. Because we hold the septic, excavation, and building sides in-house, we sequence them into one path — soil test, design, driveway, septic, water, and the home — instead of you chasing three contractors across Douglas County.
Castle Rock, Parker, Larkspur and Sedalia and the surrounding high country, out from Castle Rock. If your lot is raw Front Range / Palmer Divide ground, that’s exactly the work we’re built for.
We don’t design or stamp septic systems ourselves — that’s always done by a licensed engineer. We work hand-in-hand with our engineering partners so your package passes Douglas County (Tri-County Health successor agency) review the first time.
Tell us about the lot and we'll map the whole path — feasibility, design, permit, and build.
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