Pesticides? False! |

Pesticides and residues of drugs and industrial chemicals currently weigh heavily on the small waterways of the Canton of St. Gallen. As the latest results of a measurement campaign show, the limit values ​​have been exceeded in alarming cases – by a factor of 160.

But what does this mean concretely? The Confederation has made it clear what the proportion of problematic substances in the water might be. The limit is where substances could cause chronic damage through prolonged or prolonged contact. The problem: this value defined by the Confederation has been exceeded 160 times in some rivers of St. Gallen.

A sugar in a pool

The Confederation states that the proportion of pesticides must be less than 0.1 microgram per liter. This means that it must be smaller than a piece of sugar in a pool of 50 meters. That's the relationship. Well: this value has never been exceeded in the canton of Graubünden. On the contrary.

The Confederation has been monitoring the groundwater quality of Swiss rivers and streams for more than ten years, including Graubünden. In each case, it is measured whether and how many pesticides, drug residues or industrial chemicals can be detected.

A measuring station stands out

The last measurement campaign in May 2019 clearly shows that the limit value has not been exceeded in any of the eleven measuring stations in the canton of Graubünden. Most of the pesticides could not be detected after targeted research. In eleven cases, traces of pesticides could be detected, but in such a small quantity that they still remain well below the limit.

Only one value appears in yellow in the results: at the Maienfeld measuring point, the pesticide atrazine-desethyl could be detected in a quantity slightly higher than that of all other pesticides. But even this value decreases if you look at the results of the last years. Because: In Switzerland, it is forbidden to use Antrazin. And good news: this value is always below the limit.

Yves Quirin of the Office of Nature and Environment explains that there is no intensive culture of fruit and vegetables in Graubunden as in Mittelland. "And when pesticides are not used, they can not be detected."