Outdated Concrete in Vitens Basement Led to Boiling Water Advisories in the Amersfoort Region.

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Following an investigation, water company Vitens has likely found the cause of the water contamination in the Amersfoort region in late 2025 and January 2026: leakage through aging concrete in the basement where the water was stored. However, “no definitive cause has been established” that led to the discovery of the enterococcus bacterium.

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The contamination of drinking water in the Amersfoort region around the turn of the year was caused by damage to the concrete of a drinking water reservoir. Water company Vitens determined this following its own investigation. The contamination, involving enterococcus bacteria, meant that a significant number of people in Amersfoort and the surrounding area had to boil their water for consumption during two periods. The first time, in December 2…