The map in the link below shows the current levels of nitrates in the water of the streams used by Jersey Water to fill the reservoirs and supply to the public after treatment. This map has been produced to assist farmers and other land managers to minimise risk of causing water pollution and to make everyone aware of the impact fertilisers have on the public water supply resources. The data is updated weekly when test results are received.
Colour coding of pollution risk areas:
- Red shows the catchments where nitrate levels are above 50mg NO3/l, the maximum value allowed by the Water (Jersey) Law 1972 as amended.
- Orange shows the catchments where nitrate levels are between 40mg and 50mg NO3/l.
- Green shows the catchments where the nitrate levels are below 40mg NO3/l.
If you click on this link it takes you to the States of Jersey website where our stream nitrate map is hosted.