Urban Ecology

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DENR ADMINISTRATIVE ORDER NO. 26-A Series 1994

Subject:

PHILIPPINE STANDARDS FOR DRINKING WATER 1993 UNDER THE PROVISION OF CHAPTER II, SECTION 9 OF PD 856, OTHERWISE KNOWN AS THE CODE ON SANITATION OF THE PHILIPPINES.

To implement the provisions of section 9, otherwise known as the Prescribed Standards and Procedures of Chapter ll of the Code on Sanitation of the Philippines, PD 856, this Philippine National Standards for Drinking Water 1993 hereby revises and updates the 1978 National Standards for Drinking Water. The Philippine National Standards for Drinking Water 1993 (PNSDW 1993) is designed to guide the Waterworks Officials, Developers and Operators of Water Supply Systems both Government and Private entities, health and sanitation authorities and the general public and all other concerned. The new standards cover requirements for the acceptable values of the determined parameters in measuring water quality. These parameters include microbiological, physical, chemical and radiological compositions of the water. The standard also delineates values established in conforming with the medical and health implication of the parameters as opposed to values established purely to satisfy aesthetic requirements. Section 1. DEFINITION OF TERMS 1. Aesthetic - aspects of drinking water quality perceived by senses, including odor, taste, color and clarity. Aerobe An organism capable of growing in the presence of oxygen.

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Aerobic - Description of biological or chemical processes that can occur only in presence of oxygen. Anaerobic - Life processes or chemical reactions that occur in the absence of oxygen or a condition in which Dissolved Oxygen (DO), is not detectable in the aquatic environment. Available residual Chlorine - Generally refers to the part of the chlorine that will with orthotolidine or ampero-metric tests and exhibits significant germicidal activity. Bottled water - means water that is placed in a sealed container or package and is offered for sale for human consumption as drinking-water.

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Coliform Organism (total coliforms) - refers to any rod- shaped, non-sporeforming, gram negative bacteria capable of growth in the presence of bile salts, or other surface-active agents with similar growth-inhibiting properties which are cytochrome-oxidase negative and able to ferment lactose at either 35 or 37°C with the production of acid, gas and aldehyde within 24-48 hours. Composite Sample - refers to a mixture of grab samples collected at the same sampling points at different times. Contamination - A general term referring to the introduction of materials not normally found in water that make the water less desirable or unfit for its intended use. Disinfection - Water treatment processes designed to destroy disease - causing micro-organisms. The efficacy of disinfection is often assessd by measuring the coliform group of indicator organism. Drinking Water - Water intended for direct human consumption or for use in food preparation. Where high quality waters are scarce, the quality of water used for other domestic purposes does not need to be as high as that of drinking water. Facultative anaerobic - Organisms that can use free oxygen or can grow in the absence of atmospheric oxygen Facultative bacteria - Bacteria that can adapt themselves to growth and metabolism under aerobic or anaerobic conditions. Many organism of interest in wastewater stabilization are among this group. Thermotolerant (Fecal) Coliform - A subgroup of coliform bacteria that has high positive correlation with fecal contamination associated with all warm blooded animals. These organisms can ferment lactose at 44.5°C and produce gas in a multiple tube procedure (EC - Confirmation) or acidity with the Membrane Filter procedure (M-FC Medium). Gram or Catch Sample - A sample collected at a particular time and place and can represent only the composition of the source at the time and...
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