Round Our Way, a non-profit organisation that supports people affected by climate change, commissioned the tests.
Water samples were taken from floodwater on a street near the River Ouse in York, and lab analysis was then carried out by Oakshire Environmental.
Samples taken from the Ouse contained elevated levels of ammonia and bacteria including faecal 'indicator organism concentrations', as well as high levels of E.coli, according to Round Our Way.
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