Greenpeace is running the testing in conjunction with the Federation of Freshwater Anglers. Greenpeace is supporting calls from medical experts to take a precautionary approach, and is calling on the Government to lower the limit for nitrate contamination in water from 11.3mg/L to 0.87mg/L in line with international research linking nitrate contamination to bowel cancer and adverse birth outcomes. The major causes of nitrate contamination in drinking water are synthetic nitrogen fertiliser and cow urine. Greenpeace is continuing its call for the Government to phase out synthetic nitrogen fertiliser as part of the suite of actions needed to reduce nitrate contamination of water.