Local Context
Why Some Suamico Homes Have Mounds
Mounds go in where the ground itself won't treat effluent: it drains too slowly, it drains too fast, or groundwater or bedrock sits too close to the surface. In EPA terms, a mound is a pressure-dosed sand filter sitting on the natural soil, which takes the treated effluent from it (EPA mound systems fact sheet). If your home is outside the village's sewer service area, your county permit will show whether you have a Suamico mound system, a conventional tank or a holding tank.
Suamico has about 36 square miles of land along the bay of Green Bay (Wikipedia: Suamico), and Brown County's soils include both ends of the drainage problem. Sandy outwash soils such as the Shawano series, which the USDA established in Brown County, are excessively drained (USDA NRCS, Shawano series), and soil that drains too fast is one of the conditions, described above, that call for a mound. Near the shore or the river, groundwater can sit close to the surface. Under state code, there has to be at least 24 inches of suitable soil between the effluent and the highest estimated groundwater or bedrock (SPS 383.44), and a mound helps meet that by raising the bed above the native soil on imported sand.
After the April 2026 Flood
In mid-April 2026, record rain pushed the Suamico River over its banks, and the village issued a disaster declaration (WBAY, FOX 11). Picture a Suamico mound system on a low lot after a week like that: the alarm is on and the toe of the mound stays soggy. Our first advice is to hold off on pumping. The EPA warns that emptying a tank in saturated ground can make it try to float out and damage its pipes (EPA). Until the soil drains, use as little water as you can and send sump water away from the mound. Once it does, we'd check the electrical connections before the pump runs again, pump out silt that floodwater can leave in the pump chamber, test the floats and alarm, and walk the mound's sides for seepage.
How It Works
How Mound Pumping Differs
A conventional tank needs one pump-out. A Suamico mound system has two chambers and moving parts, so a service visit covers more:
- Septic tank pumped, sludge and scum measured, baffles checked.
- Effluent filter cleaned.
- Dosing (pump) chamber pumped out, so solids that slipped through don't get sent to the mound.
- Pump, floats and alarm tested: we watch a full dose cycle and confirm the alarm sounds.
- Laterals flushed when due. The state's standard mound plan puts both the filter inspection and lateral flushing on a three-year schedule, with flushing sooner if needed (Wisconsin DSPS mound management checklist).
- Mound surface walked for seepage, erosion or damage.
Lateral flushing and any repair are separate jobs from the two-chamber pump-out, and neither gets added to a visit without your say-so.
Our Services
Mound Repairs We Handle
When a Suamico mound system needs repair, it's usually for one of these:
- Alarm sounding: usually the pump, a float, a tripped breaker or the control panel.
- Seepage on the sides or toe: clogged laterals, uneven dosing or solids carry-over.
- Odour: loose or cracked lids, risers or vents.
- Damage: vehicles, animals or equipment on the mound.
- Failure: once the sand bed or the soil under it is clogged through, the only fix is a new mound.
The full repair and replacement process is on our mound system repair page.
Owner Tips
Living With a Mound: Owner Tips
- Keep vehicles, livestock, sheds, pools and trees off the mound; grass is the right cover.
- Don't add soil or regrade the mound.
- Never turn off the alarm circuit; it's your early warning.
- Keep sump pumps, roof drains and water softener backwash out of the system unless your design allows them.
- In winter, leave snow on the mound; it insulates the laterals.
Local Rules
Brown County Requirements
Suamico is in Brown County, and a mound is on the same three-year inspection cycle as any other system (Wisconsin DSPS), plus whatever its management plan requires. The county's Zoning Division keeps the maintenance records and posts its POWTS forms online (Brown County forms), and we file the report after each visit.
FAQ
Suamico Mound System FAQ
How often does a mound need service?
An inspection at least every three years for the county, plus anything your system's management plan requires. The pump chamber and alarm benefit from a check whenever the tank is pumped. The laterals go on the standard mound plan's three-year flushing schedule, or get done sooner if they need it.
My mound alarm went off. What do I do?
Stop using water, check the pump breaker once, and call (920) 241-6573.
Is a wet mound normal?
A little dampness after heavy rain or snowmelt can be. Seepage from the side or toe, a smell, or a patch that won't dry out means effluent is breaking out, and that's a call to us.
How many years will a well-kept mound run?
It depends on design, use and maintenance. Keeping solids out of the mound by pumping on time is the biggest factor you control.
Can you replace just the pump?
Yes. Swapping in the same kind of pump is one of the most common mound repairs, and it doesn't usually call for a new sanitary permit.