By Berend Booms, Associate Editor | Future of Assets

There is something special about tasting a product where it is made. At the Grolsch brewery in Enschede, tasting the spring water used for brewing, piped some seven kilometers from the brewery’s old Roombeek site, has been part of the tour for years. On Saturday, October 17, that small ritual ended with eleven people in the hospital.  

According to local broadcaster RTV Oost, nine visitors and two tour guides were handed shot glasses of the brewery’s spring water. One victim told the broadcaster: “After some of us tasted it, we noticed a strange, sour taste and got a burning feeling in our stomach.” Emergency services were alerted at about 15:05. Multiple ambulances, a hazardous substances adviser and specialized firefighters attended, and a German trauma helicopter was called before being stood down. 

Two days later, on Monday, October 19, Grolsch issued an explanation of what had gone wrong. The line to which the tasting tap was connected was undergoing its routine cleaning, which takes place every three weeks and uses an agent whose caustic component is sodium hydroxide. Grolsch explained: “The connection of the tasting tap was not fitted with the technical safety lock. As a result, cleaning fluid could reach the tasting tap, where normally (brewing) water is tasted.” According to the brewer, the diluted agent contained a “small percentage” of sodium hydroxide. All eleven, taken to the hospital “as a precaution,” according to Grolsch spokesperson Norbert Cappetti, have since gone home, one after a night in the hospital, though some report still having a sore throat or loss of taste. 

Isolation Covers More Than Energy 

When we talk about lockout/tagout, most of us picture a padlock on an electrical isolator. The scope has always been wider: OSHA’s lockout/tagout standard, 29 CFR 1910.147, defines an energy source as “any source of electrical, mechanical, hydraulic, pneumatic, chemical, thermal, or other energy.” In practice, any line that can carry a hazardous fluid toward a point where people are present should be isolated, locked and verified like any other energy source. 

Cleaning-in-place is exactly where this matters, because this process is designed to push caustic and acidic solutions through pipework without dismantling it. Every branch, sample point or tap on that circuit is a potential exit. Grolsch has since permanently disconnected the tasting tap’s connection and taken it out of use, which shows how simple the physical fix can be once the gap is visible.  

Routine Is Where Complacency Lives 

On paper, this reads like a story rife with routine: a cleaning cycle that runs every three weeks, a tasting tap that has always been used during tours, and a tour on a Saturday afternoon like so many before. None of these occurrences is unusual on its own; the risk emerged where they overlapped. 

I believe the most valuable safety controls are often the least glamorous. Think of technical interlocks that make it physically impossible for cleaning fluid to reach a point of use during a cleaning-in-place cycle. Think of isolation that covers fluids, with locked valves or blanked connections on every branch. Think of cleaning schedules that are checked against tours, visits and production runs. And think of a simple sanity check before anything leaves a tap: a pH or conductivity reading, a walk-down of the line, or written confirmation that the circuit has been flushed and released. None of these measures breaks the bank, and every one of them costs less than what followed in Enschede.

The Cost That Doesn’t Show on the Line

Grolsch has been clear that the incident was separate from its beer production. According to a spokesperson, “quality and safety are not at stake and have not been at stake,” and the brewer has stated that its beers are still safe to consume.  

Still, the story was covered in national news on three consecutive days, and retail trade title Distrifood listed it among its most-read stories. Police opened a forensic investigation but have since stepped back, leaving the case to the Dutch Labor Inspectorate. The brewer is still considering compensation. One victim told RTV Oost: “I hope Grolsch gives priority to safety and ensures a proper investigation and proper handling of the case.”  

That is the reality of a safety lapse in a public-facing setting. The tap may have been separate from production, but the public does not read process diagrams. What sticks is the brand name next to the words “cleaning agent” and “hospital.” Trust rests on the assumption that whatever comes out of a company’s taps is safe, whether in a bar or on a brewery tour. “Our beers are safe to consume” is the kind of quote that lingers long after the incident itself is forgotten.

Before the Valve Opens

I won’t speculate on exactly what went wrong or how it could have been prevented; the Labor Inspectorate’s investigation will establish what happened and why. But every manufacturer can ask a few questions this week. Which taps, sample points or connections in your plant can receive cleaning fluid? Which of them are interlocked? And who checks, before anything leaves a valve, that what comes out is what you expect? At Grolsch, the fix took a single disconnection. Finding the next gap before someone drinks from it is where the real work lies.