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Septic Services in Sioux Falls, SD

Minnehaha County County · Pop. 196,254

Sioux Falls is South Dakota's largest city and a growing regional economic center in the upper Great Plains. While the city proper is served by a modern municipal water reclamation system, unincorporated Minnehaha County—particularly the rapidly developing suburbs of Brandon, Tea, Harrisburg, and Dell Rapids—has substantial septic system infrastructure. Sioux Falls sits on Sioux quartzite, a billion-year-old rock formation that outcrops extensively east of the city and creates shallow bedrock conditions requiring engineered systems. The glacial till soils that blanket most of Minnehaha County have fine-textured, slowly permeable subsoil horizons formed during repeated Pleistocene glaciations. These soils freeze deeply—frost depths of 48 inches are standard—requiring all system components including distribution pipes and pump tanks to be installed below or insulated against the frost line. Spring snowmelt is the dominant hydrologic event, temporarily saturating soils and raising groundwater tables across the county for 4 to 8 weeks each year.

Septic Providers in Sioux Falls (7)

Services in Sioux Falls

Drain Field Repair

$2,000 – $15,000

Grease Trap Pumping

$200 – $800

Septic Inspection

$300 – $600

Septic System Installation

$3,500 – $20,000

Septic Tank Pumping

$275 – $600

Septic Repair

$500 – $5,000

Well Drilling

$6,000 – $25,000

Well Pump Repair

$300 – $3,000

Well Water Testing

$50 – $500

Well Water Treatment

$500 – $8,000

Septic Service Costs in Sioux Falls

Service Average Cost
Septic Tank Pumping $175 - $325
Septic System Installation $6,000 - $16,000

Soil Conditions

Sioux Falls area soils are dominated by the Brookings silty clay loam and Egan silty clay loam—both deep, well-drained to moderately well-drained Mollisols developed on glacial till. These soils have moderate permeability in the surface layer but slow permeability in the dense clay subsoil B horizon. Rock outcrops of Sioux quartzite appear east of the city, limiting drainfield depth in those locations. Split Rock Creek bottomland soils are poorly drained Fluvents.

Brookings silty clay loam (USDA series) is the dominant upland soil in Minnehaha County—a deep Udic Haploboroll with a moderately permeable Ap horizon (30-60 min/inch) overlying a slowly permeable Bw and Bt horizon (greater than 60 min/inch). The restrictive subsoil layer causes seasonal perched groundwater during spring snowmelt. Mound systems are frequently required on Brookings soils to achieve adequate separation from the seasonal high water table. Egan silty clay loam is a similar series with slightly higher clay content and more challenging drainage.

Water Table: Minnehaha County upland glacial till areas show groundwater at 10 to 30 feet. Big Sioux River floodplain areas have seasonal groundwater at 2 to 8 feet. Spring snowmelt raises water tables across the county typically from March through May.

Local Regulations

Minnehaha County Environmental Services administers DANR OSS permits under ARSD 74:53. Minimum setbacks include 50 feet from water supply wells. Sioux quartzite outcrop areas require site-specific engineering for depth to bedrock. Spring high water table conditions must be accounted for in system design with seasonal groundwater determination conducted between November and April in most cases. Mound systems are common on fine-textured glacial till soils.

Minnehaha County Environmental Services administers OSS permits under SDCL 34A-4 and ARSD Chapter 74:53. Sioux Falls city proper is served by the City of Sioux Falls Water Reclamation Division municipal sewer. Surrounding unincorporated Minnehaha County communities and newly developing rural subdivisions rely on onsite systems. A licensed engineer or SD DANR-recognized evaluator site evaluation is required before permitting.

Frequently Asked Questions — Sioux Falls

Why does Sioux Falls have such a deep frost depth requirement for septic systems?
Sioux Falls experiences one of the deepest frost penetrations among large US cities, with standard frost depth of 48 inches. This is due to the northern continental climate with extended periods of sub-zero temperatures and limited snow insulation in many winters. All septic system distribution pipes, pump lines, and access components must be installed below frost depth or with appropriate thermal insulation to prevent freezing and pipe damage.
What effect does spring snowmelt have on my septic system in Minnehaha County?
Spring snowmelt in the Sioux Falls area is the most stressful period for onsite septic systems. Rapid snowmelt raises the water table throughout Minnehaha County, often perching groundwater within 12 to 24 inches of the surface in Brookings silty clay loam soils. During this period, drainfields may temporarily lose absorption capacity. Homeowners should minimize water use during March through May to reduce hydraulic loading on the system.
Is Sioux quartzite a problem for septic installation near the city?
Yes. Sioux quartzite outcrops east of Sioux Falls create shallow bedrock conditions where the stone is at or near the surface, making conventional septic installation impossible without engineered design. These sites typically require importing substantial fill to create adequate separation from rock or using above-grade mound systems. A site evaluation will determine quartzite depth at any specific location.
What is a mound system and why is it common near Sioux Falls?
A mound system is a type of septic system where the drainfield is constructed above grade using imported sand fill to create adequate separation from the seasonal high water table and restrictive soil layer. Mound systems are common in Minnehaha County because Brookings silty clay loam soils have a slowly permeable subsoil that causes perched groundwater—insufficient depth for a conventional in-ground drainfield. Mound systems cost more to install but function effectively when properly maintained.
How often should I pump my septic tank in the Sioux Falls area?
Standard residential septic tanks in Minnehaha County should be pumped every 3 to 5 years. The cold climate—where biological activity in the tank slows significantly during winter months—does not extend pumping intervals; in fact, cold temperatures can reduce treatment efficiency and may warrant more frequent pumping for homes with heavy use. Arrange pump-outs before freeze-up in fall or after the ground thaws in spring.

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