MASON CITY — A Northern Iowa hog operation’s plans for spreading manure on farmland near Meservey are drawing scrutiny from Cerro Gordo County environmental health officials, who have identified concerns involving nearby waterways, soil erosion classifications and a substantial change in the amount of manure reported by the operation.
The concerns involve Madison Industries LLC, a hog confinement operation located at 2145 Finch Avenue near Hampton in Franklin County, approximately three miles south of the Cerro Gordo County line.
A report prepared by Cerro Gordo County Public Health is scheduled to go before the Cerro Gordo County Board of Supervisors on Monday, October 12, 2026, as part of the county’s review of an updated manure management plan.
According to the county report, the operation has a capacity of 2,490 hogs and identifies 15 fields for manure application. Fourteen are in Franklin County, while one is in Cerro Gordo County.
The Cerro Gordo County field consists of 92.6 acres in Section 33 of Grimes Township, near the community of Meservey.
County officials have identified several issues they believe warrant attention as the updated manure management plan moves through the review process.
Among them is the proximity of the manure application area to Meservey, the nearby Prairie Land Trail and small waterways within the field.
The report also highlights a change in how the farmland is classified for erosion purposes.
According to Cerro Gordo County Public Health, the field was designated as highly erodible land in last year’s manure management plan. However, the updated plan no longer identifies the same field as highly erodible.
The county report does not explain why that classification changed.
Highly erodible land can present additional concerns when manure is applied because soil erosion may carry nutrients from agricultural fields toward drainage systems and waterways.
Iowa’s manure management rules require applicable livestock operations to identify fields receiving manure, calculate nutrient application rates and account for potential soil loss and water pollution.
The Iowa Department of Natural Resources also requires manure management plans to incorporate phosphorus-index calculations, which help evaluate the potential movement of phosphorus from agricultural land.
Another notable change involves the total manure production reported by Madison Industries.
The updated plan lists 636,195 gallons of manure, compared with 1,085,832 gallons in the previous year’s report.
That represents a reduction of 449,637 gallons, or approximately 41 percent.
The county report does not identify the reason for the reduction or explain whether it reflects changes in livestock production, manure handling, calculation methods or other operating conditions.
The facility’s stated capacity remains 2,490 hogs in the information presented to supervisors.
Although the operation itself is located in Franklin County, its manure management plan is also subject to review in Cerro Gordo County because farmland there is identified for manure application.
Under Iowa regulations, qualifying confinement feeding operations must submit manure management plans and annual updates to the DNR and the counties where manure is applied.
The plans are intended to ensure livestock manure is managed as an agricultural nutrient while limiting potential impacts on soil and water resources.
The Cerro Gordo County report was submitted by Lauren Hunt of the county’s Department of Public Health in accordance with the county’s policy for reviewing manure management plans.
The policy calls for the Environmental Health Service Manager to examine submitted plans, prepare a report for the Board of Supervisors and forward identified concerns to the Iowa Department of Natural Resources.
The Madison Industries review follows other recent manure management issues considered by county supervisors. In September, NIT reported on Indigo Family Farms, also known as Ashley’s Farm, whose manure application fields included land near public wildlife areas and a Winnebago River tributary. That operation, based in Hancock County, is separate from Madison Industries.
Earlier, county health officials identified the proximity of a Thornton-area operation, Balsam Beef & Bacon, to the Union Hills Waterfowl Protection Area. In another separate review, supervisors forwarded a manure management plan update for Cattle Site–Rock Pork to the Iowa DNR.
These cases involve different facilities and application areas. Together, they show the recurring role of county environmental health staff in examining manure management filings and flagging issues for state review; they do not establish environmental violations by any of the operations.
The documentation does not establish that Madison Industries has violated environmental regulations, nor does it indicate that manure has been improperly applied to the Cerro Gordo County field.
Instead, county officials have identified questions arising from the submitted paperwork that may warrant additional review by state environmental regulators.
The distinction is important because a change in reported manure production or an erosion classification does not, by itself, demonstrate wrongdoing.
Nevertheless, the proximity of the application area to Meservey and nearby waterways makes the accuracy of the manure management information particularly relevant to residents and landowners in the area.
The Iowa DNR administers the state’s manure management requirements and is responsible for reviewing compliance with applicable environmental rules.
For operations subject to manure management planning requirements, those rules address nutrient application, land availability, soil erosion, field conditions and recordkeeping.
The Cerro Gordo County Board of Supervisors is scheduled to receive the Madison Industries report during its regular meeting Monday at 10 a.m.
The board’s consideration of the report does not itself constitute a finding of an environmental violation.
Questions remaining include why the reported manure volume declined so substantially, what prompted the change in the field’s highly erodible land designation, and whether the DNR will seek any additional information or changes to the plan.
For residents near Meservey, the review places renewed attention on how large livestock operations manage manure across county lines and how local governments evaluate potential impacts on surrounding farmland and waterways.