Results of the collaborative study coordinated
by Dr Arnauld CABELGUENNE
Before and after analyses by MyWater
in Lectroure, France.
15 jours d'essai offert

Three samples were taken on December 22, 2024: from the Gers River in Occitanie, France, from the drinking water network in Lectoure Le Norou, and from the same network after reverse osmosis.

MyWater supported this citizen-led study and provided financial support to Les Amis de la Terre Gers during one of the four sampling campaigns carried out between June 2024 and December 2025. Les Amis de la Terre Gers is one of the environmental protection and healthcare professional associations involved in this citizen science project created and organized by Dr Cabelguenne, a doctor of toxicology.

Water analysis - Lectoure, France
7 Pesticides and metabolites included in this summary.
0 µg/L Measured value after reverse osmosis for the listed pesticides.
0 µg/L Measured value after reverse osmosis for TFA in the provided chart.

Testing and quantification of pesticides and their metabolites

The values below are expressed in micrograms per liter, according to the results presented for the samples taken on December 22, 2024.

Results table - pesticides and metabolites
Sampling location Metazalachlor ESA
µg/L		 Metazalachlor OXA
µg/L		 Metolachlor ESA
µg/L		 Metolachlor NOA
µg/L		 Metolachlor OXA
µg/L		 Chlorothalonil R471811
µg/L		 Metaldehyde
µg/L
P1 - Gers River 0.085 0.098 0.64 0.06 0.25 0.29 0.11
P2 - Drinking water, Lectoure Le Norou 0.13 0.13 0.69 0.19 0.34 0.24 0.10
P3 - Drinking water, Lectoure Le Norou after reverse osmosis 0 0 0 0 0 0 0
Drinking water quality standard 0.10 0.10 0.10 0.10 0.10 0.10 0.10
The vertical line indicates the drinking water quality standard mentioned in the document: 0.1 µg/L.

Testing and quantification of TFA, a short-chain PFAS

The chart below uses the values shown in the TFA chart from the source document.

The P1 value is visually estimated from the source chart at approximately 1.8 µg/L. The P2 and P3 values are represented as 10 µg/L and 0 µg/L respectively.

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