Nitrate in shallow groundwater in the Netherlands, 2001
Developments relating to nitrate in shallow groundwater
Nitrate concentrations measured in shallow groundwater at a depth of between 5 and 15 m below ground level in 2001 exceed the standard most often under sandy soils used for agriculture. In general, the concentrations are lower than in the uppermost groundwater.
Policy
The Netherlands aims to reduce nitrate levels in groundwater to less than 50 mg/l. The EU Nitrate Directive came into force at the end of 1991. The directive includes a limit of 170 kg/ha to the amount of nitrogen applied in manure. The Netherlands is implementing the Nitrate Directive in the mineral accounting system (MINAS) and a system of manure transfer contracts. In derogation from the Nitrate Directive, the Netherlands wishes to apply up to 250 kg N/ha from manure to grassland. The European Commission still has to give its approval.
Relevance
The run-off of nitrogen (including nitrate) into groundwater threatens the quality of drinking water. A few water extraction wells in the east of the Netherlands have been shut down, deeper groundwater has to be extracted on occasion and extra costs are incurred for treatment purposes.
