The chemical finds its way into drinking water supplies. Olaf Kaspryk, head of the Rastatt public works department, goes in search of clues.

It takes time to gather samples and conduct blood tests. Farmers have to destroy entire harvests.

Many residents no longer drink tap water, but the chemicals are already detectable in their bodies. Mothers are warned not to breastfeed their children.

PFAS, per- and polyfluoroalkyl substances, are found in many everyday products such as Teflon pans and water-repellent clothing.

They accumulate in the environment and in tissue, and can cause considerable damage.

PFAS pose risks to human health, including an increased risk of certain cancers, fertility issues and a reduced response to vaccinations.

The harmful substances were found in compost that was spread on fields.

To date, the investigation and remediation bill for the PFAS case in Rastatt has reached €40 million.

PFAS are highly persistent in the environment and don’t easily break down, which is why they’re also known as "forever chemicals".

The EU is currently considering a PFAS ban.

The Rastatt case constitutes one of the biggest environmental crimes in Germany, the consequences of which will be felt for a long time to come.