When it comes to wastewater management in rural areas, not every property is a good fit for a traditional in-ground septic system. Soil that doesn’t drain well, a high water table, or shallow bedrock can make it difficult for a standard system to work correctly. For many homeowners in Wisconsin, a mound septic system is the best alternative.
Understanding “How do mound septic systems work?” when they’re necessary, and how to take care of them can help you make confident choices about your property’s septic setup. Here’s what you should know.
How Do Mound Septic Systems Work?
A mound septic system handles household wastewater in a layered, elevated filtration setup that works above the native soil. It includes three main parts: the septic tank, a dosing chamber, and the mound itself, which is built using sand and gravel.
After wastewater leaves your home, it first enters the septic tank, where solids settle and begin breaking down. From there, the liquid effluent flows into a separate chamber called the dosing chamber. This chamber contains a pump and float system that sends measured amounts of effluent to the mound.
Once in the mound, the wastewater moves through layers of sand and gravel. These materials help filter out impurities before the treated water reaches the soil below. Because the system distributes water in doses rather than a constant flow, the mound has time to process and filter wastewater more effectively.
When Are Mound Systems Needed?
Mound systems are common throughout Wisconsin because of the state’s variable soil and topography. If your property has poor drainage, shallow bedrock, or a high water table, a standard in-ground system may not be allowed under state regulations.
Wisconsin was actually one of the first states to implement mound systems back in the 1970s, recognizing their usefulness for areas where conventional setups aren’t safe or reliable. Today, they remain a common and acceptable alternative when the soil can’t support a traditional drain field.
Maintaining a Mound System in Wisconsin Conditions
Wisconsin’s climate and seasonal changes mean homeowners should stay proactive about mound system care. Maintenance helps avoid overloading the system and extends its life.
- Check the pump and floats regularly. At least once a year, inspect the dosing chamber to make sure the pump is functioning and the floats are in good condition.
- Schedule regular pumping. Most septic tanks need pumping every three years, but households with higher water use or smaller tanks may need more frequent service.
- Avoid driving or building over the mound. Compacted soil can stop the system from draining properly. Keep the area clear of vehicles, heavy equipment, and new structures.
- Grow grass or shallow-rooted plants on the mound. Vegetation helps with evaporation and erosion control, but be sure to avoid plants with deep roots that might interfere with system components.
- Watch for red flags. Wet spots, unusual odors, or bright green patches of grass near the mound could be signs the system isn’t filtering properly.
Benefits and Considerations
Mound systems are a reliable choice for areas where the soil won’t support a standard system. They protect groundwater by filtering wastewater thoroughly, even on properties with less-than-ideal soil.
While they tend to cost more to install, they offer long-term value when they’re appropriately maintained. A well-installed and maintained mound system typically lasts 20 to 30 years.
Sunset Septic Says: Know What to Expect from a Mound System
If you live in a rural part of Wisconsin with dense clay soil or high groundwater, a mound septic system may be the best option for your property. These systems require a little more attention than traditional ones, but regular inspections, careful water usage, and proper landscaping can keep them running smoothly for decades.
Sunset Septic Service works with Wisconsin homeowners to evaluate property needs, recommend the best system setup, and provide reliable maintenance. Whether you’re learning about septic systems for the first time, just curious how do mound septic systems work, or looking to take better care of an existing one, Sunset Septic can help.
