Shallow bedrock with less than the required depth of usable soil above it
Low pressure mound systems designed, installed, and serviced for shallow soils and rocky ground across Jefferson County
When there is not enough usable soil below the surface, a Wisconsin mound system builds the treatment area above it so your property can still support a safe, permitted septic system.
A Wisconsin mound system is an above-grade drain field. Sand fill and gravel are placed on top of the natural ground, and treated effluent is pumped up into that sand bed through small pressure laterals. The sand does the filtering work that shallow native soil cannot do on its own.
Around Birmingham, this matters. Plenty of lots in Brookside, Gardendale, and the ridges north of Fultondale sit on thin topsoil over sandstone or shale, and low spots near the Locust Fork and Village Creek drainages hold water long after a heavy spring rain. Both conditions fail a conventional drain field.
Brookside Septic Tank Service has worked these hillsides and hollows since 1969. As a master plumber certified, licensed and bonded septic contractor holding a Level 2 septic license, we handle the soil review, the design coordination, the installation, and the long-term septic tank maintenance that keeps a mound working.
Mound systems are usually recommended after a soil evaluation shows limited vertical separation between the trench bottom and a restrictive layer. A septic system inspection on an existing property can point the same direction when a conventional field keeps failing.
A mound is only as good as the crew that built it. Sand placed in wet conditions, a smeared basal area, or an undersized pump will shorten the life of the whole system.
We have installed and repaired alternative systems on Jefferson County property for decades, and we service what we install.
Mounds work differently from a gravity drain field, so most questions are about upkeep, cost, and daily use.
How is a mound system different from a conventional drain field?
How often does a Wisconsin mound system need pumping?
Can I plant grass or drive over the mound?
What happens if the pump fails?
A Wisconsin mound is one of several ways to make a difficult lot work. If your soil report points a different direction, these are the other system types we design and install.
If a perc test came back poor, a permit calls for an alternative system, or your old field keeps surfacing after a rain, we can tell you what your soil will actually support. Bring us the soil report or let us start from scratch, and we will walk the lot with you and give you a straight answer on a Wisconsin mound system for your Birmingham-area property.