Septic System Installation in El Paso County: Cost and Permit Process
Nationally, a new septic system typically costs $3,480–$11,625 installed, and aerobic or mound systems run $10,000–$20,000 (This Old House, 2026). In El Paso County, add the county permit: $961 for a new system ($1,131 with surcharges), and the application has to come from a licensed installer. Our own published starting point for a new install is $8,000.
| Point | Details |
|---|---|
| National installed cost | $3,480–$11,625 typical; complex systems can pass $23,000 (This Old House, 2026) |
| County permit (new system) | $961 base fee, $1,131 with surcharges (El Paso County Public Health) |
| Who applies | A licensed OWTS installer, required since January 1, 2024 |
| Permit processing | 10–20 business days intended for a new permit |
| Soil evaluation | At least two soil profile test pits under Colorado Regulation 43 |
| Our published price | Installs from $8,000, repairs from $1,200, written quote after a free site visit |
How much does septic system installation cost in El Paso County?
The honest answer is a range, because the soil decides the system and the system decides the price. National cost guides give the scale. This Old House's March 2026 guide puts a typical installation at $3,480–$11,625, with an average near $7,500, and notes that labor is usually 50–70% of the bill. Fixr's 2025 data puts an engineered system at $12,000–$15,000 and a new drain field alone at $3,500–$11,000.
| System type | When it's used | National installed range |
|---|---|---|
| Conventional (anaerobic) | Soil that accepts water well at depth | $3,000–$8,000 |
| Chambered | Plastic chambers in place of gravel trenches | $5,000–$12,000 |
| Sand filter | Soil that needs extra treatment before dispersal | $7,000–$18,000 |
| Drip distribution | Shallow soil or tight lots | $8,000–$18,000 |
| Aerobic treatment unit | Poor soil or higher treatment required | $10,000–$20,000 |
| Mound | Shallow bedrock, high water table or very slow soil | $10,000–$20,000 |
Ranges: This Old House septic installation cost guide, updated March 2026 (pricing attributed to Angi). National averages, not a local price list.
Two things push El Paso County jobs toward the upper half of those ranges. First, the ground: dense clay in some areas and decomposed granite in others, often on the same road, so the drain field has to be sized for the soil actually found in the test pits. Under the county's 2026 rules, soil types 4A and 5 require pressure distribution with at least two alternating zones, and several newly defined soil types require a professional engineer's design. Second, the permit and inspection steps add real cost and time. On our septic system installation and repair page we publish installs from $8,000 and new systems typically at $8,000–$25,000+, depending on system type, soil and lot. If your property is on city sewer instead of septic, see what sewer line repair costs in Colorado Springs.
What permits does a septic system need in El Paso County?
Septic systems, called onsite wastewater treatment systems (OWTS), are permitted by El Paso County Public Health for homes not served by a municipal sewer. Since January 1, 2024, permit applications must be submitted by a licensed OWTS installer. These are the fees on the county's current fee schedule:
| Permit or service | County fee | Intended processing |
|---|---|---|
| New OWTS permit | $961 ($1,131 with surcharges) | 10–20 business days |
| Major repair or modification permit | $891 ($914 with surcharges) | 7–10 business days |
| Minor repair permit | $554 ($577 with surcharges) | 3–5 business days |
| Extra design revision (after the first) | $144 per request | Holds the permit until paid |
| Reinspection beyond those included | $338 | As scheduled |
Source: El Paso County Public Health, OWTS Fee Based Services, effective January 1, 2024 (revised January 2025).
The new-system permit fee covers one application review, one site evaluation, one design revision request, a pre-sand placement inspection, a construction inspection and one follow-up visit. A failed inspection that needs a return trip is billed as a reinspection, which is one reason the install has to be right the first time.
What are the steps from soil test to final approval?
- Site and soil evaluation. Colorado's septic rule, Regulation 43, bases the design on visual and tactile evaluation of at least two soil profile test pits; percolation tests are optional and only supplement the pits. In some parts of the county the test pits must stay open until the health department has seen them.
- System design. A licensed installer can submit a conventional design. Systems on difficult soils, and any design using pressure distribution, involve a professional engineer, whose certification letter must include a residual head (squirt height) test.
- Permit application. The licensed installer submits the application and fee through the county's online portal, then answers any design revision request.
- Excavation and installation. Tank and drain field go in to the permitted design. If imported sand is part of the design, the county inspects the open excavation before the sand is placed, and tanks must be at least three-quarters bedded before the installation inspection.
- Final approval and records. Once the inspection passes, the system is backfilled and the records are filed with the county, where future owners can look them up through the county assessor's property search.
What changed in El Paso County's septic rules in 2026?
El Paso County Public Health's revised OWTS regulations took effect on July 11, 2026. The changes most likely to affect a homeowner's install:
- Tank risers now need secondary safety features on permits for new systems, repairs, modifications and alterations.
- A two-way cleanout is required outside the house when none exists, as close to the house as practical and no more than 50 feet from the outside wall.
- Property line setbacks may be reduced from 10 feet to as little as 3 feet without a Board of Health variance, when justified and compliant.
- Design flow increases by 50 gallons per day when occupancy exceeds two people per bedroom.
- Property sales no longer require a certified septic inspection review; the review is now optional.
- Soil reports must include cementation information beginning January 1, 2027.
How long does septic system installation take?
Plan on weeks for paperwork and days for the dig. The county's intended processing time for a new permit is 10–20 business days, and design revision requests can extend it. Fixr's 2025 data puts the installation itself at 2–5 days on site. In El Paso County, rocky ground, a mound or sand filter design, and winter conditions all lengthen the on-site portion, so schedule the soil evaluation early if you are building.
Who should install your septic system?
A licensed OWTS installer who handles the permit, the 811 utility locate and the inspections, and who writes the restoration into the quote. The county keeps a list of OWTS professionals, and our guide to choosing an excavation company in Colorado Springs covers the seven questions to ask before you sign. Replacing a failed tank or field rather than building new? See what septic excavation and tank replacement involve.
Out in Black Forest, Peyton and Falcon, the system is designed around what the test pits show, not around what the neighbor has. Matt walks the lot, explains what the soil allows, and gives you a written price before anything is dug. Permit applications, design to county code, our own crew on the excavation and the final inspection sign-off are part of the job, not your homework.
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