Soil testing & engineered design
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 Gilpin County Public Health permit stands on.
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Service Area · Peak-to-Peak high country
Licensed contractor in Gilpin County, Colorado
Senior-led septic, excavation, driveways, water storage, and custom building across Gilpin County — Peak-to-Peak high country at 8,000–9,500 ft — with the hard mountain site work handled in-house.
Licensed & insuredGilpin County Public HealthReg 43 OWTSCentral City to Black Hawk
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 Gilpin 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 Gilpin County terrain inside and out — rocky forested ridges, historic mining ground, and steep access. Whether your property is in Central City, Black Hawk and Rollinsville, we deliver site work built for Peak-to-Peak high country conditions and permitted under Gilpin County Public Health and Colorado’s Regulation 43.
What we handle in Gilpin County
Septic / OWTS installation
Full onsite wastewater systems — conventional, pressure-dosed, and advanced-treatment — installed for Peak-to-Peak high country ground and Gilpin County Public Health review.
Excavation, grading & driveways
Access, building pad, utilities, and all-weather driveways cut for Gilpin County — rocky forested ridges, historic mining ground, and steep access.
Water storage & cisterns
Buried cisterns and fire-suppression storage for lots without a reliable well, or where the county requires stored water on site.
Custom home construction
From a build-ready design or your own plans, we take a raw Gilpin County lot through to a finished, permitted home.
Feasibility & site planning
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
Driveways & Drainage
Gravel construction, repairs, swales and culverts in Gilpin County →
Septic / OWTS
In Gilpin County →
Soil & Perc Testing
In Gilpin County →
Excavation, Grading & Driveways
In Gilpin County →
Water Storage & Cisterns
In Gilpin County →
Fire Suppression Water
In Gilpin County →
Custom Home Construction
In Gilpin County →
Site Feasibility Reports
In Gilpin County →
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 Gilpin County Public Health review the first time, without the back-and-forth that stalls a Gilpin County build.
SepticIQ · Instant plan-based estimate
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 Gilpin County
We serve Central City, Black Hawk and Rollinsville and the surrounding Peak-to-Peak high country high country, out from Central City. At 8,000–9,500 ft, Gilpin County brings rocky forested ridges, historic mining ground, and steep access — conditions our crews work in every week, not once a season.
Gilpin County — questions
Do you handle septic permitting in Gilpin County?
Yes. We excavate the soil test pits, coordinate the engineered design with a licensed engineer, and hand you a permit-ready package for Gilpin County Public Health under Colorado Regulation 43. On Peak-to-Peak high country ground — rocky forested ridges, historic mining ground, and steep access — that soil evaluation is what the whole system is designed from.
Can you bundle septic, driveway, and the house together?
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 Gilpin County.
Which Gilpin County towns do you work in?
Central City, Black Hawk and Rollinsville and the surrounding high country, out from Central City. If your lot is raw Peak-to-Peak high country ground, that’s exactly the work we’re built for.
What don’t you do?
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 Gilpin County Public Health review the first time.
Building in Gilpin County?
Tell us about the lot and we'll map the whole path — feasibility, design, permit, and build.
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