Agricultural Drain Tile Disputes in South Dakota: Surface Water Runoff and Neighbor Liability

Across East River South Dakota-from the fertile corn and soybean ground of Minnehaha, Lincoln, Lake, and Moody counties to the glacial prairie pothole regions of Brown, Spink, Beadle, and Brookings counties-the rapid expansion of subsurface pattern drain tiling has ignited fierce legal battles between neighboring farm families. While perforated plastic drain tile boosts yields on wet quarters by lowering the water table, improperly engineered tile outlets and high-capacity lift stations can dump millions of gallons of concentrated runoff across a section line or township road, drowning a downstream neighbor's crops for weeks.

In South Dakota, a landowner does not have an unrestricted right to rid their fields of excess water at a neighbor's expense. Agricultural surface and subsurface drainage is strictly governed by S.D. Codified Laws § 46A-10A-1 et seq. and the state's modified Civil Law Rule. Understanding what constitutes permissible drainage, when slough pumping becomes illegal, how to challenge a neighbor's tile project before the County Drainage Board, and how to obtain a court injunction and crop damages is essential to protecting your farmland.

The 'Civil Law Rule' for Natural Drainage in South Dakota

For rural agricultural surface water drainage, South Dakota rejects the 'common enemy doctrine' and instead enforces the Civil Law Rule, which the Legislature codified directly into S.D. Codified Laws § 46A-10A-20 and S.D. Codified Laws § 46A-10A-70. As the South Dakota Supreme Court explained in Knodel v. Kassel Township, 581 N.W.2d 504 (SD Supreme Court 1998) and reaffirmed in Zwart v. Penning, 912 N.W.2d 833 (SD Supreme Court 2018), the Civil Law Rule burdens lower (servient) agricultural property with a natural drainage easement under which the upper (dominant) property owner may reasonably discharge surface water over the lower land through natural watercourses (S.D. Codified Laws § 46A-10A-1(15)) or established watercourses (S.D. Codified Laws § 46A-10A-1(9)).

Under S.D. Codified Laws § 46A-10A-70, subject to county drainage controls, a farmer may drain land 'in the general course of natural drainage by constructing open or covered drains [including subsurface drain tile] and discharging the water into any natural watercourse, into any established watercourse or into any natural depression whereby the water will be carried into a natural watercourse.' However, both S.D. Codified Laws § 46A-10A-70 and a century of South Dakota Supreme Court precedent impose strict legal boundaries on that right:

• The Wholly-On-Own-Land Requirement: Under S.D. Codified Laws § 46A-10A-70, the drain tile must be constructed wholly upon the owner's own land. An upper farmer cannot daylight a tile main at the property fence line so that it jets concentrated water directly onto the surface of a neighbor's field where no defined watercourse exists.
• No 'Unnatural or Unusual Quantities' Causing Unreasonable Harm: In Winterton v. Elverson, 389 N.W.2d 633 (SD Supreme Court 1986), an upper farmer installed a tile drainage system that discharged water that previously evaporated or seeped slowly into the ground onto a lower neighbor's field, rendering several acres untillable. The South Dakota Supreme Court affirmed an injunction halting the drainage, holding that an upper owner violates the Civil Law Rule by collecting and casting surface or subsurface waters upon lower land in unnatural or unusual quantities that stay on the lower property and unreasonably increase the natural burden.
• No Altering Watercourses to Flood Lower Neighbors: In Rumpza v. Zubke, 900 N.W.2d 601 (SD Supreme Court 2017), the Supreme Court upheld both a mandatory injunction ordering the removal of unauthorized drainage modifications and an award of monetary crop damages when an upper landowner dug out a watercourse and altered drainage structures, causing persistent flooding on the downstream farm.
• Mandatory Township Consent for Road Ditch Discharges: Under S.D. Codified Laws § 46A-10A-70 and the Supreme Court's ruling in McLaen v. White Township, 974 N.W.2d 714 (SD Supreme Court 2022), even if a county drainage board approves a farmer's drain tile permit, the farmer cannot discharge drain tile water into a public township highway ditch without first obtaining the affirmative consent of the Township Board of Supervisors having supervision of that road.

Illegal Slough Drainage and Prairie Pothole Pumping in South Dakota

While accelerating normal rainfall runoff down a natural draw is permissible when done reasonably, draining a landlocked slough, closed basin, or permanent prairie pothole is strictly illegal under South Dakota law unless downstream landowners consent or a formal statutory drainage project is established. Under the Civil Law Rule codified in S.D. Codified Laws § 46A-10A-20, an upper landowner is prohibited from:

1. Cutting Through a Natural Ridge or Watershed Divide: Trenching through a natural elevation barrier to divert water from one drainage basin into a different watershed where it would never naturally flow is an automatic per se violation of South Dakota drainage law.
2. Pumping Out Closed Depressions: Using tractor-driven PTO pumps, electric lift stations, or deep-cut tile mains to empty a closed basin or landlocked wetland that only overflows during historic 25-year or 100-year flood events casts 'unnatural and unusual quantities' of water onto servient land in violation of Winterton v. Elverson, 389 N.W.2d 633 (SD Supreme Court 1986).
3. Obstructing a Natural Watercourse from Below: Conversely, under Knodel v. Kassel Township, 581 N.W.2d 504 (SD Supreme Court 1998), a lower landowner cannot take self-help revenge by bulldozing an earthen dike or dam across a natural watercourse at the property line to back natural water onto the upper neighbor's land.

The Federal USDA 'Swampbuster' Consequence: Beyond state court liability, farmers who tile or pump out a natural wetland without prior approval from the USDA Natural Resources Conservation Service (NRCS) via Form AD-1026, Federal, USDA Farm Service Agency, Highly Erodible Land Conservation and Wetland Conservation Certification and a certified wetland determination on Form NRCS-CPA-026, Federal, USDA Natural Resources Conservation Service, Highly Erodible Land and Wetland Conservation Determination risk violating federal Swampbuster provisions (16 U.S.C. § 3821). A single Swampbuster violation can strip an agricultural producer of all federal crop insurance premium subsidies, commodity program payments, and conservation loans across every acre the farmer operates.

How to File a Complaint with the County Drainage Board

Under S.D. Codified Laws § 46A-10A-1 et seq., the South Dakota Legislature delegated primary administrative oversight of rural drainage to county commissions and appointed county drainage boards-such as the Minnehaha County Drainage Board, Sioux Falls, the Lincoln County Drainage Board, Canton, the Lake County Drainage Board, Madison, the Brookings County Drainage Board, Brookings, the Brown County Drainage Commission, Aberdeen, and the Davison County Drainage Commission, Mitchell. Under S.D. Codified Laws § 46A-10A-30, walking a tile plow into a field to install new drainage without a permit in a county that has adopted official drainage controls is a Class 1 misdemeanor (and subject to civil fines of up to $1,000 per day under S.D. Codified Laws § 46A-10A-30).

As the South Dakota Supreme Court clarified in Carmody v. Lake County Board of Commissioners, 938 N.W.2d 433 (SD Supreme Court 2020), aggrieved farmers have two distinct procedural avenues under S.D. Codified Laws § 46A-10A-34 and S.D. Codified Laws § 46A-10A-35:

1. Administrative Drainage Complaint or Permit Objection: You can file a formal written Drainage Complaint with the County Drainage Administrator or appear in opposition at a neighbor's tile permit hearing. Under S.D. Codified Laws § 46A-10A-34, the County Drainage Board may hold an evidentiary public hearing and order the violator to modify, plug, or remove an unpermitted or non-conforming drain under S.D. Codified Laws § 46A-10A-36.
2. Strict 20-Day Deadline to Appeal a County Drainage Board Decision: Under S.D. Codified Laws § 46A-10A-35 and S.D. Codified Laws § 7-8-29, any appeal from a final decision of a County Commission or County Drainage Board granting or denying a drainage permit must be perfected within 20 days after publication or notice of the decision!
3. Direct Civil Lawsuit in Circuit Court: Crucially, S.D. Codified Laws § 46A-10A-35 also states that any affected landowner may bypass the county board's adjudication process and commence a civil action directly in the Circuit Court to seek an injunction and recover monetary crop damages (since a County Drainage Board has no legal authority to award money damages for ruined crops).

Suing for Crop Damages and the Timeline for Filing Injunctions

When a neighbor's unlawful drain tile or slough pump floods your fields, waiting until harvest to take legal action can cost you an entire growing season. South Dakota agricultural litigation attorneys pursue a two-pronged court strategy in the local Circuit Court-such as the Second Judicial Circuit Court, Minnehaha County Courthouse, Sioux Falls, the Third Judicial Circuit Court, Brookings County Courthouse, Brookings, the First Judicial Circuit Court, Davison County Courthouse, Mitchell, or the Fifth Judicial Circuit Court, Brown County Courthouse, Aberdeen:

1. Timeline for Emergency TROs, Preliminary Injunctions, and Permanent Injunctions

• Temporary Restraining Order (TRO) (S.D. Codified Laws § 15-6-65(b)): If a neighbor is actively trenching an unpermitted tile main toward your fence line or running a high-volume pump that is actively submerging your planted crop, your attorney can file a Verified Complaint and Motion for a TRO. A circuit judge can issue a TRO within 24 to 72 hours (lasting up to 10 days, extendable for another 10 days) ordering the neighbor to shut off the pump immediately.
• Preliminary Injunction (S.D. Codified Laws § 15-6-65(a)): Within 2 to 4 weeks, the court holds an evidentiary hearing to keep the drainage shut off while the lawsuit is litigated.
• Permanent Mandatory Injunction (S.D. Codified Laws § 21-8-14): Following trial, as affirmed in Rumpza v. Zubke, 900 N.W.2d 601 (SD Supreme Court 2017), the court can enter a permanent injunction compelling the upper owner to permanently cap, reroute, or rip out the unlawful tile. Note that in Magner v. Brinkman, 883 N.W.2d 74 (SD Supreme Court 2016), the Supreme Court cautioned that a judge cannot grant both 'future permanent diminution-in-value damages' and a permanent injunction stopping the water (as that would be a double recovery); instead, the farmer recovers past crop loss damages plus a permanent injunction stopping future flooding.

2. Proving Monetary Crop Loss and Soil Degradation Damages

Under S.D. Codified Laws § 15-2-13(3), a South Dakota farmer can recover monetary damages for trespass and water injury going back 6 years prior to filing the complaint. To maximize recovery, preserve four pieces of evidence every season:

• Combine Yield Monitor Maps & Precision Ag Data: Export multi-year spatial yield maps showing exact bushel-per-acre drops inside the flooded plume compared to unflooded acres in the same field.
• Drone Aerial Photography & NDVI Satellite Imagery: Capture timestamped aerial photos during spring snowmelt and summer rain events showing water jetting from the neighbor's tile outlet and drowning emerging crops.
• Prevented Planting & Crop Insurance Records: Gather FSA 578 acreage reports and crop insurance loss worksheets showing acres you were prevented from planting or forced to replant.
• Agronomist Soil Salinity Testing: Subsurface tile water carries dissolved salts that accumulate when water pools and evaporates on lower land; soil lab tests prove long-term saline/sodic remediation costs.

How Much Does a Drain Tile Dispute Cost to Litigate in South Dakota?

• County Drainage Permit / Complaint Fee: Most South Dakota counties charge $50 to $250 for a drainage permit application and $0 to $100 to file an administrative drainage violation complaint.
• Circuit Court Filing Fee: Filing a civil complaint for an injunction and crop damages (or a 20-day county drainage appeal) in South Dakota Circuit Court costs $70 using Form UJS-232, South Dakota, Unified Judicial System, Civil Case Filing Statement.
• Agricultural Engineer / LiDAR Survey Expert Fees: Retaining an agricultural drainage engineer to run LiDAR elevation models, calculate tile pipe flow rates (cfs), and testify on natural versus unnatural quantities typically costs $3,500 to $10,000.
• Agricultural Litigation Attorney Fees: Representing a landowner at a County Drainage Board permit hearing typically costs $1,500 to $3,500, while litigating a Circuit Court injunction and crop-damage lawsuit is billed at $250 to $450 per hour (or a hybrid contingency fee on past crop damage recoveries).

How Long Does the Process Take?

• Appeal of County Drainage Board Permit: Must be filed within 20 days of publication or notice of the board's decision under S.D. Codified Laws § 46A-10A-35.
• Emergency TRO to Stop Active Slough Pumping: 1 to 3 business days from filing the verified complaint and engineer/farmer affidavits.
• County Drainage Board Administrative Complaint Resolution: 30 to 90 days from complaint investigation to public board hearing.
• Full Circuit Court Injunction & Crop Damages Trial: 8 to 16 months depending on seasonal field inspections and expert discovery.

Whether you need to block an unlawful drain tile outlet, appeal a County Drainage Board permit within the strict 20-day window, or sue for flooded crop losses, connect with an experienced South Dakota agricultural and water law attorney in our directory today.

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