Annexure - Hydrogeology: Objectives, Methods, Applications - page 319

A water body is considered to be in a good chemical state when:
• the directive conditions are met;
• the directive conditions are not met, but;
○ the concentrations are not considered to present a risk, due for
example to the size of the reservoir;
○ the capacity of the water body to satisfy human use has not been
compromised.
Control sites must provide a global and coherent image of quality,
as well as representative data, which the member states will publish a
summary of.
Trends
The identifi cation of signifi cant long-term trends that are increasing will
prompt actions to reduce pollution. The starting point of an increasing
trend must be specifi ed.
Complementary evaluations will verify that the plume originating
from a contaminated site is not spreading, is not degrading the chemical
quality of the water, and will verify that the resource does not constitute
an environmental and health risk. The results of these evaluations will be
summarized in management plans.
Dangers
In order to reach the goal of preventing and limiting the introduction
of pollutants, member states will be required to specify in which cases
substances are dangerous or not, and to take into account diffuse pollution.
Introduction of pollution by direct discharge or authorized recharge,
concentrations with no present or future risk, and the consequences of
accidents or natural disasters can be excluded from these programs.
Future
From 2009 to 2013, any new authorization procedure must take the directive
into account. The list of substances may be amended by the addition of
new pollutants.
Annex I: Quality standards
The limit for nitrates is 50 mg·L -1 . For pesticides, it is 0.1 µg·L -1 for each
molecule or metabolite, the sum not exceeding 0.5 µg·L -1 .