The Premier Septic Maintenance Provider of Winona County and Southeastern Minnesota

Theis Septic Service has been in business for 40+ years serving all of Winona County. We are the premier septic maintenance company in the area and provide services to ensure your system is performing at an optimal level.

We clean and empty your septic tank properly to assure a longer life for your septic system. We provide unrivaled service and attribute our success to our attitude about cleanliness and the overall customer experience.

The value for the services we provide are second to none. This is our only business, confirming that we are the experts in the septic maintenance industry. We understand the mechanical working of every type of septic system and are available to answer any questions you have.

We would be proud to earn your business, contact us today for a septic evaluation and maintenance!

• Residential & Farm

• Septic Tank Pumped & Back-Washed

• Septic Tank Lid Replacement & Riser Ring Installation

• Tank Location Service

• Yes, We Service in the Winter!

• Emergency Service Available

After flushing a toilet the solids and liquids travel down a plumbing line into the septic tank. The septic tank is a vault, which traps solid waste and allows clear liquid to flow through to the drainfield. Inside the septic tank solids and liquids separate into 3 layers. The top layer is called the scum layer. It consists of floatables including: fats, oils, grease, soaps, and phosphates. The middle layer is the liquid layer, and the bottom layer is the sludge layer. The sludge layer consists of heavy particles of organic matter which break down through an anaerobic process. The clear water exits the tank through an outlet baffle and is dispersed into the drainfield which absorbs the water. When the tank becomes crowed with solid waste, it backs up.

Septic tank pumping requires a small section of your yard to be dug up; we take great pride in how we leave the site after service. A typical septic tank is about 1,000 gallons. The tank needs to be located, dug up, and pumped. Theis Septic Service will come to your house, pump the septic tank clean and leave you without the worry of future issues.

Depending on the size of your tank, number of people in your household and the amount of wastewater generated, you should pump at least every 1-3 years.