Commentary: Missouri’s CAFO policy is built to multiply pollution, not prevent it

Missouri’s refusal to establish setback spacing requirements between concentrated animal feeding operations, to CAFOs. isn’t just a bureaucratic oversight — it’s a structural failure that guarantees cumulative pollution.

Our laws treat each CAFO as if it exists in isolation, but rural communities live with the reality of multiple industrial barns clustered together, all potentially draining into the same creeks, the same wells, and the same air column.

A single large CAFO can produce more manure than a small city. When two or three facilities operate side by side with no spacing requirements whatsoever, their waste streams can overlap. Yet the state reviews each permit separately instead of asking the obvious question: What happens when all that waste enters the same watershed? Rural Missouri already shows the consequences: increasing nitrate levels in private wells, persistent phosphorus pollution in streams, and industrial odors so strong that nearby residents cannot open their windows.

Missouri’s list of impaired waters has grown from 24 streams in 2002 to 549 in 2026. Of these, 215 were added after local control was removed in 2020 by SB391. Nearly half are impaired by e-coli or nutrients, potentially linked to CAFO waste and runoff.

The absence of setbacks is a likely accelerant. It allows industrial barns to stack like freight containers, concentrating millions of gallons of manure and wastewater in tight clusters. Regulators may insist each facility “meets its permit,” but permits don’t account for the combined load of multiple CAFOs operating in the same drainage area. Rural residents aren’t living next to one operation: they’re living next to the accumulated waste of an entire cluster.

A new trend is making the problem even worse: CAFOs are deliberately building barns just under the permit threshold to avoid regulation altogether. By staying a few animals below the number that triggers a state operation permit, operators side-step engineering reviews, public notice requirements, and even basic environmental safeguards. These “permit‑exempt” barns still produce enormous quantities of manure, yet they operate with virtually no oversight.

This loophole has become a strategy. Instead of one fully regulated barn, companies build two or three unregulated barns — each technically below the threshold but collectively producing the same waste load as a major CAFO. And because Missouri has no setbacks for Class II operations, these barns can be placed right next to each other, creating a de facto industrial complex with none of the protections that would normally apply.

The problem doesn’t stop at the property line. Missouri also refuses to regulate exported chicken litter — the waste hauled off‑site and spread on fields miles away. This creates a second layer of cumulative impact. A CAFO can legally export thousands of tons of manure into a watershed already saturated by neighboring operations, and regulators will still claim “no violation” because each facility’s paperwork looks clean.

This is the core failure: Missouri regulates CAFOs as isolated units, but pollution behaves as a single, combined system. Without setbacks, without spacing, without limits on exported waste, and without closing the permit‑exempt barn loophole, the cumulative burden grows heavier every year.

Setbacks cannot solve every problem, but they acknowledge a basic truth: closely clustered CAFOs create cumulative pollution beyond any single permit’s control. Rural Missourians deserve a regulatory system that recognizes reality instead of pretending that each lagoon, each waste storage building and each load of manure exists on its own island. Ignoring a