Residues found in rivers are mainly from detergents - not agriculture, research concludes.
https://phys.org/news/2024-07-glyphosate-european-rivers-farming.html 

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Makes sense really as detergents go straight down the drain rather than through the plant which takes up the majority of the chemical applied.

On contact with soil it changes to something harmless anyway.

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To be accurate that’s not what the report says, is it?  

It says, “Their hypothesis is that glyphosate is a transformation product from aminopolyphosphonates which are used extensively in Europe and especially in laundry detergents.  Initial laboratory tests have now been completed and confirm the hypothesis of glyphosate formation in wastewater treatment plants from this laundry additive. However, there is also some good news: "We do not see glyphosate formation when we simulate conditions directly in the washing machine."

Interestingly that article concludes with a contrast between the US and Europe, where in the US detergents don’t contain aminopolyphosphonates.

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