Physical and Chemical Quality for Acceptability Aspects
Constituent Remarks
Taste The cause of taste must be determined.
Odor The cause of odor must be determined.
Color Decomposition of organic materials such as leaves or woods usually yield coloring substances to water; Tannins, humic acid, and humates from the decomposition of lignin; Insoluble form of iron and manganese; colored suspended matters
Turbidity Turbidity increases with the quantity of suspended matters in water.
Aluminum Aluminum sulfate is used in water treatment as coagulants
Chloride Chloride in drinking water originates from natural sources, sewage and industrial effluents, urban runoff, and seawater intrusion.
Copper Copper in drinking water occurs primarily as corrosion of interior of copper plumbing especially with acid pH or high-carbonate waters with alkaline pH.
Hardness Hardness is due to the presence of naturally occurring divalent cations, such as calcium, magnesium, and strontium resulting from contact of acidic groundwater with rocks such as limestone and dolomites. Hardness beyond the standard value maybe acceptable for drinking by the consumers in certain areas.
Hydrogen sulfide Hydrogen sulfide may be generated by microorganisms under anaerobic conditions in bottom of swamps, marshes, eutrophic lakes and groundwater.
Iron Applicable for existing and new water supply systems. Iron is found in natural fresh waters. It may be present in drinking water as a result of the use or iron coagulants or the corrosion of steel and cast iron pipes during water distribution.
Manganese Applicable for existing and new water supply systems. Manganese is naturally occurring in many surface and groundwater sources, particularly in anaerobic or low oxidation conditions.
pH The pH range is based on aesthetic consideration only. The acceptable range may be broader in the absence of a distribution system. pH is important as operational water quality parameter
Sodium Sodium is usually associated with chloride, thus, it may have the same sources in drinking water as chloride. Water softeners can add significantly to the sodium content in drinking water especially from water refilling stations.
Sulfate High levels of sulfate occur naturally in groundwater.
Total Dissolved Solids (TDS) TDS in drinking water originate from natural sources, sewage, urban runoff and industrial wastewater.
Zinc Zinc may occur naturally in groundwater. Concentration in tap water can be much higher as a result of dissolution of zinc from pipes.

Related Posts :
Sources , Occurences & Persistence of Organic Contaminants in Drinking Water
Sources , Occurences & Persistence of Inorganic Contaminants in Drinking Water
Sources , Occurences & Persistence of Disinfection Chemicals in Drinking Water
Sources , Occurences & Persistence of Organic Pesticides in Drinking Water
Philippine National Standards for Drinking Water 2007