Drinking water for all : Water quality surveillance
One of the objectives of Diam - The Public Authority for Electricity and Water is to ensure the best quality of the water provided to our customers. Diam Water quality teams are committed to our work to monitor, control and improve the water quality.
Where do we check the Water quality?
The quality of the water supplied by Diam is checked at various points in the water cycle:
- From the outlet of water production plants
- To the sampling points distributed across the water network
How is the water quality checked?
The water quality checking and monitoring is achieved through strict procedures and standards, in accordance with the Omani Standard.
Diam is using a new Laboratory Information Management System (LIMS) in order to schedule the surveillance program all around Oman. This new system ensures the complete traceability of each sample and simplifies the statistical assessment of the data.
Some analyzes are made directly on site (with some portable equipment and trained operators) and others analyzes are made in laboratories in each region.
The parameters tested in the Diam are physical, chemical and microbiological.
The Diam laboratories test the water quality of the samples collected across the water supply network. There is currently one central laboratory in Muscat and one laboratory in each region of the Sultanate to ensure water quality is monitored all throughout the country.
What is chlorine and why do we need it?
Chlorine is a halogen element, as shown on the chemical periodic table of Dmitri Mendeleev (1834-1907). Chlorine is a very powerful oxidant and disinfectant, which is used most often for water disinfection purpose around the world, because of its immediate and long lasting residual effects. Chlorine has been used for more than one hundred years for this purpose. The Omani Standard for residual Chlorine levesl in the drinkable water follows the World Health Organization recommendations, and as international good practices Diam is doing its best to respect this requested level. A lack of Chlorine can lead to bacteriological contamination of the water and damage to human health.
After the desalination process at our water production plants, the water is transported across the network to our customers. The Omani Standard establishes the requested level of chlorine for the potable water. The duty of Diam is to secure and to protect the water during this transportation, which can take several hours, in order to save it from any bacteriological contamination. The chlorine level could decrease during the transportation process, depending on the duration and other parameters like the temperature, the organic matter present, or the pipe material. So after desalination, the water is chlorinated to reach the Omani standard (which is between 0.2mg/l and 0.5mg/l of free chlorine) and could be re-chlorinated during the transportation process, in order to reach the Omani Standard chlorine level at the final point of the distribution system, the customer service point.