Will I die if .....?
...if I grow water cress in my newly resurrected pond and eat it? I have ordered a solar fountain for it and it is newly washed and scrubbed. I already have nasturtium growing around it so I would prefer to put something edible to keep it looking nice. I have read that the water could contain some nasties. Here is a photo - it is not big and not filled yet.

A good hoeing is worth two waterings.
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https://www.who.int/water_sanitation_health/resources/vector337to356.pdf
I would think that the chances of your eating a freshwater snail, infested with fluke or not, are fairly slim.😊
If you live in Derbyshire, as I do.
Unless there is some reason you don't trust the water, like rats pee in it or something, I would eat it. There are various ways to easily cultivate in the garden also.
https://www.rospa.com/leisure-safety/Water/Advice/Weils-Disease
Plenty of safe way to grow in the garden though.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Thank you @Dovefromabove and @herbaceous I may try in the garden @GemmaJF as I am going to try and grow wild garlic, so I could grow the cress next to them - coolest part of the garden! We have been having super hot summers -yuk!!
If you are interested.......
We are out of lockdown here - it's a mess. On Monday, people in their droves went to the Spanish border "Le Perthus" for their ciggies and alcohol. Most people wearing masks but supermarket carparks chokka. Beaches to open today for sport activities - walking in the water and along the beach etc. no picnics or sunbathing, no dogs. The flora and fauna has excelled during the 2 months of spring so the mayors wish to let the fledglings fly the nest first. Cafés & restaurants to open but with restrictions. Kids back to school - half classes or 10 to a class. No fun in the playground! Diesel and petrol are cheap -1.23€ petrol and 1.09€diesel.