The results showed:
The concentrations of E.coli were high, with only a handful of sites meeting the sufficient level for inland bathing water.
- in the upper catchment, down to Birstwith the concentrations of E. coli were much lower than in the middle and lower catchment .
- E.Coli concentrations rose below Killinghall STW and stayed high, with the most extreme value at the Nidd Viaduct, below the confluence of Oak Beck and the river Nidd
- Knaresborough sampling locations had concentrations well above the levels deemed sufficient for inland bathing water.
- From Hunsingore down to Moor Monkton the concentrations of E.Coli doubled between each sampling site, reaching a maximum just before the Nidd meets the Ouse.
- The tributaries in the middle and lower Nidd Catchment all had high concentrations of E.coli – Ripley Beck, Oak beck, Bilton Beck (extremely high) and Crimple Beck.