SepticIQ Plans

Instant estimate from engineered plans

How Much Does a Septic System Cost in Colorado?

Upload your engineered septic plans. Our automated system reads the full design—tank, treatment area, distribution, quantities, and notes—then generates plan-based pricing and connects you with Tri-Lakes Contracting, a licensed Colorado OWTS installer.

PDF plansPlan-aware takeoffColorado pricing

Plan intake

Upload your septic plans

Drop your PDF here or click to browse · septic design or full plan set · up to 50 MB

Don’t have engineered plans yet? Answer a few project questions—no PDF required.

Get a rough cost estimate

Project address

County Your name Phone Email When do you want to build? OWTS design status

Private plan review · preliminary estimate, not a binding proposal

Your plan summary

We’ll show what we found—not just a number.

Your result identifies the planned system, key quantities, pricing assumptions, and anything that still needs a site check.

System and tank configuration
Distribution and treatment area
Estimated installation range
Plan-sheet references and unknowns

Demo · sample result

Example preliminary plan estimate

Gravity-fed chamber system

Likely installation range$31,000–$38,000Demo result · final price follows Tri-Lakes review and site verification

Septic tank1,500 gal · 2 compartmentSheet OWTS-2

DistributionGravity-fed through D-boxPlan-based example

Treatment areaTwo chamber trenchesPlan-based example

Design flow450 gal/day3-bedroom residence

Gravity-flow explainer

How a gravity-fed chamber system works

Conceptual flow only · not your actual layout, a scaled plan, or an engineered design

Concept overview

Why an engineer specifies advanced treatment

This setup can make a difficult site buildable when a conventional system cannot safely or practically fit—often because usable land is tight, the evaluated soil type has a restrictive LTAR, or bedrock, groundwater, wells, or surface water limit where the soil treatment area can go.

Site and soilLTAR controls the required area

The long-term acceptance rate is how many gallons each square foot of soil can accept per day over the long term. Lower-LTAR soil needs a larger treatment area; the baseline calculation is design flow ÷ LTAR.

Treatment trainCleaner effluent reaches the soil

The septic tank settles solids, the ATU reduces organic matter and suspended solids, and pressure laterals spread a controlled dose through treatment sand. The approved unit and engineered plan—not the label “ATU” alone—determine its treatment level.

Design flexibilityA smaller approved footprint may be possible

Higher-level effluent may qualify for a higher LTAR, less vertical separation, or shorter setbacks to certain features. Imported treatment sand creates a known treatment medium when the evaluated soil type, structure, percolation rate, or rock conditions call for it.

Long-term benefitLess stress on the infiltrative surface

Lower solids and organic loading help protect the soil treatment area and support long-term performance. They do not guarantee that the field will never need repair, and the ATU adds power, controls, inspections, and ongoing service.

1 of 415 sec per card

ReadyFollow the wastewater from the house through the soil treatment area.

Auto-replays

Estimate allowances included

Your instant estimate includes practical allowances for plan quantities or site conditions Tri-Lakes will confirm before the final contract.

Colorado septic installation pricing

How much will your engineered septic system cost to install in Colorado?

The real cost depends on the system shown in your plans: tank capacity, gravity or pressure distribution, advanced treatment, treatment-area materials, excavation, site access, and county requirements. Upload the engineered PDF above for an estimate based on the actual design instead of a generic statewide average.

See Colorado septic system cost ranges and cost drivers

Colorado service areas

Licensed Colorado septic system installation by county

Tri-Lakes Contracting is the licensed OWTS installer behind SepticIQ. We price your engineered design and build the complete system—including permitting coordination, excavation, tanks, treatment equipment, distribution, and the soil treatment area—in the Colorado counties below.

How Much Does a Septic System Cost in Colorado?

Upload your septic plans

How much will your engineered septic system cost to install in Colorado?

Licensed Colorado septic system installation by county

Your plans are ready. Let’s price the build.