HomeGuide's national figures put a conventional septic system at $3,500 to $8,500 installed, and a drain field replacement at $3,000 to $15,000. Much of the land around Cheyenne has no sewer, so septic work is a big part of our business.
The costs quoted on this page are national ranges published by HomeGuide, and none of them is our price. Frost depth, caliche, swelling clay, access and the long hauls of rural Wyoming all change a Cheyenne job. We read the HomeGuide pages in October 2026.
What does a new septic system cost in Laramie County?
A new septic system costs $3,500 to $8,500 for a conventional design, $4,000 to $15,000 for an alternative system and $15,000 to $50,000 or more for an engineered one, per HomeGuide. The 1,000-gallon tank by itself costs $1,000 to $1,500. Deep frost means tanks and lines must be buried and insulated with care.
What does it cost to replace a leach field?
Replacing a leach field costs $3,000 to $15,000, around a $7,900 national average, by HomeGuide. Bringing an old field back costs $1,000 to $5,000, while a new tank and new field together cost $4,500 to $20,000.
How do I know my leach field is failing?
A failing leach field shows up as soggy or extra green strips over the lines, sewage odor, slow drains and gurgling pipes, and backups. Have the tank pumped and checked first; HomeGuide puts pumping at $300 to $700. Fields that freeze in winter can also back up.
Do I need a perc test, and will my Wyoming lot pass for septic?
Yes, you need a soil and percolation evaluation before a septic system can be designed. Expect $600 to $2,000 for a perc test, by HomeGuide's count. Sandy, gravelly soils around Cheyenne often drain well, but caliche, shallow groundwater or clay can limit a site.
How much is a mound septic system on a wet or shallow lot?
A mound septic system costs $25,000 to $50,000 or more by HomeGuide's figures. It builds the drain field above the natural ground where the soil is too thin, too wet or too tight. An aerobic treatment unit, $20,000 to $40,000 or more, is another option.
What does it cost to fix a broken septic line?
Fixing a broken or collapsed septic line costs $40 to $180 per foot, or $1,600 to $7,200 on average, using HomeGuide's new sewer line figures. Lines that froze and cracked are common culprits here. A camera finds the damage first.
How big is a 1,000-gallon tank hole, and how can I find my septic lid?
The hole for a 1,000-gallon tank must be wider than the tank on all sides, and the design sets the depth, which is deeper in frost country. HomeGuide does not price the tank hole on its own. To find the lid, check the permit records for the property, then probe where the drawing shows the tank.
Can I connect to city sewer instead of a new septic?
You can connect to city sewer when a public line is close enough and the utility, such as the Cheyenne Board of Public Utilities, allows it. Switching from septic to sewer costs $3,000 to $15,000 on HomeGuide's sewer page, and the hookup fee itself $1,000 to $15,000.
Who issues septic permits around Cheyenne and southeast Wyoming?
Septic permits depend on the county. In Laramie County, small wastewater systems follow the Laramie County Small Wastewater Regulations, administered by the Cheyenne-Laramie County Health Department's environmental health division. In Albany County, the Planning Department issues an Authorization to Construct. In Platte County, around Wheatland and Chugwater, the Wyoming DEQ Water Quality Division issues the permit to construct. In Larimer County, Colorado, the county health department issues septic permits. We dig under the approved design; we do not design systems.
Want a price for your own place? Call or text (307) 317-7006, and after a site visit we put the scope and the cost on paper.