Service Area · Northern plains / South Platte
Senior-led septic, excavation, driveways, water storage, and custom building across Weld County — Northern plains / South Platte at 4,600–5,400 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 Weld 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 Weld County terrain inside and out — irrigated plains, sandy river-bottom ground, and high agricultural water tables. Whether your property is in Greeley, Fort Lupton and Keenesburg, we deliver site work built for Northern plains / South Platte conditions and permitted under Weld County Public Health & Environment and Colorado’s Regulation 43.
What we handle in Weld 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 Weld County Public Health & Environment permit stands on.
Full onsite wastewater systems — conventional, pressure-dosed, and advanced-treatment — installed for Northern plains / South Platte ground and Weld County Public Health & Environment review.
Access, building pad, utilities, and all-weather driveways cut for Weld County — irrigated plains, sandy river-bottom ground, and high agricultural water tables.
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 Weld 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 Weld 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 Weld County Public Health & Environment review the first time, without the back-and-forth that stalls a Weld 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 Weld County
We serve Greeley, Fort Lupton and Keenesburg and the surrounding Northern plains / South Platte high country, out from Greeley. At 4,600–5,400 ft, Weld County brings irrigated plains, sandy river-bottom ground, and high agricultural water tables — conditions our crews work in every week, not once a season.
Weld 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 Weld County Public Health & Environment under Colorado Regulation 43. On Northern plains / South Platte ground — irrigated plains, sandy river-bottom ground, and high agricultural water tables — 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 Weld County.
Greeley, Fort Lupton and Keenesburg and the surrounding high country, out from Greeley. If your lot is raw Northern plains / South Platte 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 Weld County Public Health & Environment 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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