Top-rated septic tank pros.

Get matched with top septic tank pros in Onalaska, WI

Enter your zip and get matched with up to 5 pros

Need a pro for your septic tank service project in Onalaska, WI?

Select your specific project to find the pro for you.

Verified Reviews for Septic Tank Service pros in Onalaska, WI

*The Angi rating for Septic Tank Service companies in Onalaska, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Septic Tank Service needs.

*The HomeAdvisor rating for Septic Tank Service companies in Onalaska, WI is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Septic Tank Service needs.

Last update on January 05, 2026

Find Septic tank pros in Onalaska

Avatar for American Home Shield – Home Warranty
American Home Shield – Home Warranty
3.5(
5,688
)

Serving Onalaska, WI and surrounding areas

In business since 1971

Credit card accepted

"The technician emptied the freezer, which was in the basement, to work on the part that needed repair. Then he neglected to put anything back into the freezer, including a turkey I had bought for Christmas and a rack of ribs. Two days after he left, I went out of town for two weeks. The turkey actually exploded and spewed its liquid all over everything, which had to be discarded. I let AHS know and they couldn't even bother to call me or follow up on this. I'm considering not renewing my contract with them because of the quality (or lack thereof) of many of the providers they send."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+2

Recommended by65%of homeowners
Request Quote
Triple M Contractors
New to Angi

Serving Onalaska, WI and surrounding areas

In business since 2005

Free estimates

Credit card accepted

We pride ourselves on being the best Excavation company in the area.\n\nWe've built an excellent reputation for customer satisfaction by providing quick estimates, a great attention to detail, and competitive pricing.\n\nBeing a screened and approved professional gives you the peace of mind you need to allow us to give your home the attention it deserves. Call us today and let's get started!

Request Quote
Septic Tanks questions, answered by experts

Start by finding the septic tank, marked by an access lid near your home. From there, the drain field extends outward in a series of trenches. Look for greener, lusher grass, as drain fields promote plant growth due to moisture and fertilizer. You can also check property records, use a soil probe to detect damp soil, or hire a septic professional with ground-penetrating radar equipment to map the drain field’s location.

On average, septic systems last between 15 and 20 years. However, with proper care and routine septic maintenance, you may be able to extend your septic system’s life span to 30 years (or more). Some ways to keep your system in tip-top shape include scheduling a professional inspection every two to five years and reducing the flow of wastewater into your system.

While mound septic systems can provide cost-effective wastewater treatment in many instances, they do come at a significant initial installation cost and require a lot of space on your property for the mound and its replacement field. The installation cost is so high because this is a project that requires an exceptional level of skills and expertise to execute properly.

Most shallow residential wells are somewhere between 25 and 50 feet deep. They are among the simplest well systems. Deeper wells usually involve drilling to a much greater depth. Water wells for household use are typically 100 to 500 feet deep, depending on local groundwater conditions. Some may be up to 1,000 feet deep or more. 

Conventional anaerobic septic systems are the most cost-effective and least expensive type, with installation costs typically ranging from $3,000 to $8,000. For comparison, sand filter systems cost between $7,000 and $18,000, while mound systems are the most expensive at $10,000 to $20,000. Several factors influence the final price. The tank material is a key consideration; plastic tanks are the most budget-friendly option, starting around $2,900, but concrete and fiberglass tanks offer greater durability and longer life spans at a higher cost. The size of the tank also affects the price. For example, a 1,000-gallon tank costs between $900 and $1,500, whereas a larger 1,500-gallon tank costs $1,500 to $2,500.

The Onalaska, WI homeowners’ guide to septic tank services

From average costs to expert advice, get all the answers you need to get your job done.

See all articles