Derogations from the environmental quality standards may only be permitted in the river basin management plans in accordance with Articles 53, 54 and 56 of the Decree of 18 July 1993 concerning the integral water policy.
The basic environmental quality standards stated in Article 22.214.171.124, for the assessment of status, apply to the heavily modified and artificial bodies of water stated in Article 52 of the Decree of 18 July 2003 concerning the integral water policy. By way of derogation from this, other environmental quality standards may be determined for the following parameters in the river basin management plans: dissolved oxygen, electrical conductivity, chloride, sulphate, pH and all biological parameters.
In the case of the protected areas referred to in Article 71 of the same Decree, stricter environmental quality standards may be set in the river basin management plans.
The Government of Flanders shall, at the set times and at least when reviewing the river basin management plans, assess and where necessary adjust the environmental quality standards, as referred to in Article 2.2.3, §4 of the Decree of 5 April 1995 concerning the general provisions related to environmental policy.