Professionals’ forum Water quality

Water quality

In compliance with World Health Organization (WHO) Guidelines with respect to water intended for human consumption, drinking water quality is of major concern to CDE.

CDE, as a matter of priority, carries out bacteriological and physico-chemical tests on waters collected from underground or surfaces sources with a view to providing the population with quality drinking water. For this CDE is equipped with a Central and decentralized laboratories in the various regions served by its network. Three other laboratories on sub-contract complement this arrangement.

Organization of control
The control of water quality is predicated upon regulations introduced in the World Health Organization (WHO) guidelines. This control depends on the type of resource (groundwater or surface), the flow of resources, the treatment facilities and the populations served. The organization of water quality control is based on a network of monitoring points and consists of 3 levels: the resource at the collection point before treatment, production at the point of release for distribution and distribution.

• The Resource
Monitoring aims to ensure that water quality is proper for drinking water production. It also allows monitoring the quality of resources over time to initiate actions if necessary towards preserving its quality and, where appropriate, adjust the treatment process at the production plant.

Two types of analysis are applied depending on whether the resource is groundwater or surface. The number of tests depends on the extraction flow.

• Production
Similarly, analyses apply at the exit of treatment depending on whether the source of the water is underground or surface. The frequency of tests is linked to the output of the production unit. These controls are used to verify the effectiveness of treatment and the observance of quality requirements before the water is distributed. The number of tests depends on the output.

• Distribution
The frequency of inspection tests depends on the size of the population served. The tests verify that water quality has not deteriorated during storage in reservoirs and transportation pipelines in the public network. They reflect the quality of water at consumer's tap.

Analytical Activities at the Central Laboratory
The analyses and tests performed at the Central Laboratory are:
• Bacteriological
• Physico-chemical
• Physico-chemical

The Central Laboratory also provides additional analysis for parameters that are not yet being handled by regional laboratories, and provides technical supervision, follows their achievements and the training of officials assigned to these laboratories.