Septic & OWTS · Larimer County
Septic system installation in Larimer County, Colorado
Tri-Lakes designs, permits, and installs onsite wastewater systems throughout Larimer County — from Fort Collins to Red Feather Lakes. We build for plains edge climbing into foothills and mountain parks, with highly variable soils, and we handle the Larimer County Department of Health & Environment permit and inspections start to finish.
Larimer County sits in the Northern Front Range / foothills at roughly 5,000–8,500 ft — ground that decides how a septic system has to be built.
Onsite wastewater on Larimer County lots means designing around plains edge climbing into foothills and mountain parks, with highly variable soils. Those conditions rule out a one-size drainfield: the soil evaluation drives whether your lot takes a conventional gravity system, a pressure-dosed field, or an engineered treatment unit. We've built all three across the Northern Front Range / foothills.
Every install is permitted through Larimer County Department of Health & Environment under Colorado's Regulation 43. We prepare the stamped design, submit the OWTS permit, coordinate the county's inspections, and do the excavation in-house — so the same crew that reads your soil is the one setting your tank.
Towns we serve in Larimer County
- Fort Collins
- Loveland
- Estes Park
- Berthoud
- Red Feather Lakes
How your Larimer County project works, start to finish
Site Feasibility Report
We start at your lot. On a site visit we check property setbacks, read the slope, make a hands-on visual assessment of the soil, and cross-reference county and health-department code for anything that could constrain a system. You get a written feasibility report and a real plan for the site — typically within three business days.
Testing Proposal
With the feasibility done, we quote the next step — the soil profile testing — so you know the cost before going any further.
Soil Profile Pit Test
Once you move forward, we come back out and dig two soil profile pits to read the actual soil horizons on your lot. That's the hard data the design depends on — no guesswork, no assumptions.
Engineered System Design
We hand the soil data to a licensed engineer, who designs and stamps the septic system plans your county requires.
System Proposal
With stamped plans in hand, we price the materials and permitting off the design and give you a firm quote on the actual system.
Installation
Once the system is approved and paid, our crew installs it — tank, drainfield or treatment unit, and lines. The same crew that read your soil is the one setting your system.
Inspection & Final
We schedule the county's final inspection, backfill, restore the site, and hand you a system documented for the life of the property.
Septic in Larimer County — questions
Who permits a septic system in Larimer County?
Onsite wastewater permits in Larimer County are handled through Larimer County Department of Health & Environment under Colorado's Regulation 43. We prepare the design and submit the OWTS permit, then coordinate the inspections for you.
Can you install septic on Larimer County's terrain?
Yes. Larimer County sits at roughly 5,000–8,500 ft with plains edge climbing into foothills and mountain parks, with highly variable soils. We design pressure-dosed, advanced-treatment, and engineered systems specifically for these conditions.
How much does a septic system cost here?
It comes down to your soil and the system type your lot requires. We start with a feasibility report and soil profile pits, then price the real system off the engineered plans — not a guess over the phone.
Septic work in the high country
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.
Building or fixing a septic system in Larimer County?
Send your lot details and we'll map the soil test, design, Larimer County Department of Health & Environment permit, and install.
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