Government of Pakistan
Ministry of Science and Technology


Water Research for Changing World



National Water Quality Laboratory (NWQL)

The NWQL is a premier laboratory of water quality in Pakistan. In a short span of time, it has established itself as a centre of excellence in water quality management, by upgrading its infrastructure and improving the expertise of its professionals. It has the capacity to analyze more than 114 water quality parameters (drinking, irrigation and wastewater) and is fully capable to support industry, research institutes and universities in this area. The NWQL has three main sections: Microbiological Analysis Section; Chemical Analysis Section; and Wastewater Analysis Section. The National Water Quality Laboratory has the capability to analyze the following physical, chemical, microbiological parameters and trace elements.

Physical/Aesthetic Parameters: Colour, Odour, pH, Total Suspended Solids (TSS), Turbidity and Taste.
Chemical Parameters: Alkalinity, Ammonia, Bicarbonate, Calcium, Carbonate, Chloride, Conductivity/Total Dissolved Salts (TDS), Fluoride, Free Chlorine, Magnesium, Nitrate, Nitrite, Nitrogen, Phosphate, Phosphorus, Hardness, Sodium, Sulphate, 54 Potassium, Persistent Organic Pollutants, Oil and Grease, Silica, Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Dissolved Oxygen (DO), Free CO2 and Chlorine.
Trace Elements: Arsenic, Boron, Cadmium, Chromium, Iron, Lead, Manganese, Mercury and Zinc.
Microbiological Parameters: Total Coliforms, Fecal Coliforms, E. Coli, Total Plate Count.

The Laboratory has achieved continuation of accreditation for 26 water quality parameters, after the successful surveillance audit of the Laboratory Quality System. After which a full assessment of NWQL simultaneously by Norwegian Akkrediterign (NA) and Pakistan National Accreditation Council (PNAC) on September 8-9, 2010 and another full assessment by PNAC on February 19-20, 2013 have been conducted. The last assessment audit was performed by PNAC on July 2015.