Rock Hill Residents Sue Proper Brands Over Cannabis Facility Odor

September 21, 2026

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Rock Hill, Missouri covers about one square mile and holds roughly 5,000 residents, the kind of place where a change at one industrial address gets noticed by everyone within a few blocks. On September 14, 2026, two of those residents, Robert Smejkal and Tim Heimann, filed a class action lawsuit against Proper Brands and its operating LLC, New Growth Horizons, arguing that the company's cannabis cultivation and extraction facility has been pumping noxious odor into their neighborhood for months on end. The petition frames this as a public nuisance claim, one that allegedly has dented property values for something like 1,500 households sitting within a half-mile radius of the plant.

What makes the dispute worth watching beyond Rock Hill's borders is the mismatch in scale. This is a town small enough that its entire footprint could fit inside a mid-sized suburban development, now facing off against a cannabis operation that was acquired last year for $102 million by a much larger multistate player. That kind of capital backing changes the calculus for both sides -- it raises the stakes for compliance, and it raises the stakes for residents wondering whether a well-funded operator has enough incentive to actually fix the smell rather than just manage the paperwork around it.

What the Lawsuit Alleges

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The lawsuit was filed in St. Louis County Circuit Court, with Smejkal and Heimann named as lead plaintiffs representing a proposed class of neighboring property owners. The petition's central factual claim is straightforward and vivid: it alleges that surrounding properties have been physically invaded by noxious marijuana odor on frequent, recurrent, and continuing occasions, not as an occasional whiff but as a persistent condition affecting daily life at home. That language matters legally, since nuisance claims typically hinge on showing a pattern of interference rather than isolated incidents.

Plaintiffs are asking the court to certify the case as a class action covering the roughly 1,500 households within a half-mile of the facility, which would let residents pursue relief collectively rather than filing hundreds of individual suits. The demands include a jury trial along with both compensatory and punitive damages, the latter suggesting the plaintiffs want to characterize the company's conduct as more than simple oversight. A separate negligence count argues that Proper Brands failed to operate the facility in a manner that mitigates odor as required under Rock Hill's own municipal code, effectively tying the tort claim directly to a documented regulatory standard rather than leaving it to a jury's general sense of what's reasonable. That linkage could make the negligence claim easier to argue than a generic nuisance theory, since it gives plaintiffs a concrete benchmark the company allegedly failed to meet.

Inside the Proper Brands Facility

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The facility at the center of the suit sits at 2609 Rock Hill Industrial Court, on a strip of industrial-zoned land that nonetheless backs up against residential streets and a sports complex used by local families. That proximity is part of what makes this dispute different from odor complaints tied to a facility sitting in a genuinely isolated industrial park -- there's no substantial buffer zone here, geographically speaking.

Proper Brands runs a combined cultivation and extraction operation at the site, which raises the odor stakes considerably compared to a flower-only grow. The company cultivates more than 70 strains of cannabis and processes them into a range of products including resin, live rosin, and distillates destined for edibles and vape cartridges. Extraction processes, particularly those involving solvents and concentrated terpene profiles, can generate odor signatures that differ from and sometimes exceed what comes off a standard flowering room, which is one reason processing sites tend to draw more scrutiny than pure cultivation facilities.

Ownership context matters here too. Vireo Growth acquired Proper Brands in 2025 in a deal valued at $102 million, though the acquisition left Proper's original leadership team and brand name in place rather than folding it into a rebrand. That structure means the day-to-day operators residents have been dealing with are largely the same people as before the sale, even though the company now operates with the financial backing of a larger multistate enterprise. The scale of production, spanning cultivation and multiple extraction methods, helps explain why odor complaints have proven persistent even after the city intervened.

City Code, the Notice of Violation, and 300-Plus Complaints

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Rock Hill's municipal code sets a strict bar: no odor from a licensed facility is supposed to be detectable by a person with a normal sense of smell once it crosses the property line. That's a zero-detection standard rather than a threshold based on concentration or duration, which makes it one of the stricter local odor ordinances applied to cannabis operators in the state.

The city issued a formal Notice of Violation to Proper Brands on February 4, 2026, requiring the company to submit and implement a corrective action plan. That notice didn't emerge in a vacuum. The city had set up a dedicated complaint email specifically for residents to report odor issues, and that inbox has logged more than 300 complaints, a figure now cited directly in the lawsuit as evidence of the problem's scope and duration.

City officials had already flagged the issue publicly before the notice of violation. Back in April 2025, Rock Hill acknowledged the odor problem and said it was coordinating with the Missouri Department of Health and Senior Services, the state agency overseeing cannabis licensing, on how to address it. City Administrator Garrett Schlett has said Proper Brands appeared before city boards on multiple occasions and made operational adjustments that did reduce the volume of complaints coming in, suggesting the company wasn't simply ignoring the issue. Whether those adjustments were enough to satisfy either the municipal code or the plaintiffs is now a question for the court rather than the city council. Proper Brands did not respond to a request for comment as of publication.

Why Cannabis Odor Lawsuits Are Becoming More Common

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Rock Hill isn't an outlier. Odor nuisance suits have trailed cannabis cultivation and processing facilities in states from California to Massachusetts as their legal markets have matured and scaled up production well beyond the smaller craft-grow footprint many towns originally zoned for. What starts as a permitted use in an industrial corridor can turn into a years-long legal headache once neighbors start comparing notes and complaint logs pile up.

Local odor ordinances like Rock Hill's put compliance burden squarely on the operator, and that burden extends beyond growers to extraction and processing sites, which often produce their own distinct and sometimes stronger smells. Property value diminution claims have become a common legal theory in these cases even absent any proof of physical health harm, since courts have generally been willing to recognize persistent offensive odor as a compensable interference with property use and enjoyment on its own.

Facilities sited near dense residential zoning tend to draw far more scrutiny and litigation risk than those tucked into truly industrial corridors with real buffer distance from homes, which is a siting lesson operators in other Missouri towns are likely watching closely right now. How this case resolves, whether through settlement, corrective mandate, or a jury verdict, could shape how other Missouri municipalities write or enforce odor standards for future cannabis licensees, particularly in towns that approved facilities without anticipating how close cultivation and extraction would end up sitting to family neighborhoods.

Nobody in this dispute is arguing that the odor doesn't exist -- Rock Hill's own notice of violation and its complaint log say as much, and the lawsuit simply builds on that documented record. The real fight is over whether Proper Brands' corrective measures, whatever form they take, can realistically satisfy a code that demands zero detectable odor beyond the property line. That's an unforgiving standard to meet at the scale this facility operates, running both cultivation across more than 70 strains and multiple extraction processes producing resin, live rosin, and distillates.

Whatever the court decides, the case is a signal to operators elsewhere: odor compliance near residential zoning isn't a soft nuisance issue to manage with better filtration and hope for the best. It's becoming a genuine source of legal exposure, backed by class-action mechanics and punitive damages claims, especially once a company has the deep pockets of a multistate acquisition behind it. Cannabis facility siting rules, nuisance law, and odor ordinances all vary considerably by state and even by municipality, so anyone dealing with a similar situation, whether as a resident, an operator, or a local official drafting code, should look closely at their own jurisdiction's specific standards and talk to a lawyer familiar with local land use and cannabis regulation before assuming how a case like this one will play out.