Safe Drinking Water Lecture Notes PDF

MLS COMMUNITY AND PUBLIC HEALTH 106 LECTURE / 8:00 AM - 10:00 AM SAFE DRINKING WATER...

MLS COMMUNITY AND PUBLIC HEALTH 106 LECTURE / 8:00 AM - 10:00 AM SAFE DRINKING WATER GENERAL GUIDELINES OUTLINE Standards for drinking-water shall conform under this AO I 2017 PNSDW and its Manual of operation A Reasons for revision of 2007 PNSDW Improved framework comprising of 3 key components B Scope and coverage C General guidelines o Health-based targets D Specific guidelines o _______________________________ E Classification of drinking-water quality parameters o A system of independent surveillance F Quality Assurance/ Quality Control II WATER-BORNE DISEASES SPECIFIC GUIDELINES A Common Water-borne diseases Parasites STANDARDS FOR DRINKING WATER QUALITY Bacteria Virus Clear, free from objectionable taste, odor and color III Toxic Agents in Water Compliance to the standard values o Microbiological o Physical DOH AO NO. 2017-0010 o Chemical PHILIPPINE NATIONAL STANDARDS FOR o Radiological DRINKING WATER Parameters shall be classified as: ____- WHO International Standards 1958 o _________________ 1978 - Sanitation of the Philippines (PD 856), 1975 o _________________ 1993 - WHO Guidelines (2nd Ed.) 1993 o _________________ ____- Concrete evidence of the DOH commitment to achieve the MDG for water and sanitation STANDARDS FOR WATER SAMPLING & 2017 - July 2017, official launching Dec. 12, 2017 EXAMINATION Initial and periodic examination (Micro, Physical, REASONS FOR REVISION OF 2007 PNSDW chemical & Radiological) experiences of water service providers in complying with Minimum number of samples are based from source and standards mode of distribution WHO Guidelines for Drinking-Water Quality 4th edition, The collection of water samples shall comply with the 2011 - new parameters - improved framework of drinking- standard sampling requirements. water safety for water quality monitoring, testing and “ONLY CERTIFIED SAMPLING PERSONNEL SHALL analysis COLLECT Water samples for regulatory purposes” DOH AO 2014-0027, Water Safety Plan for all drinking- examined only in DOH ACCREDITED LABORATORY water service providers and methods based on 22nd edition of Standard Methods Sustainable Development Goals (SDG) water supply for the examination of water and waste water (SMEWW) indicators _______________shall be conducted only by PNRI. standards of drinking-water quality during emergency STANDARDS FOR OTHER MODE OF SCOPE AND COVERAGE DISTRIBUTION Drinking water service providers Initial and periodic examination for refilling stations, o Government and private developer and operators vending machines, mobile tanks and bulk water supply o Bulk water, refilling station, vending machine and must meet sampling frequency operators standard values for mandatory parameters shall be Ice manufacturers applied except for pH = 5-7 and TDS not exceed 10 mg/L Food establishments Mobile tanks: Residential, commercial, industrial and institutional o Cl2 residual: at least 0.5 mg/L but does not exceed buildings 1.50 mg/L at the point of delivery Health and sanitation authorities Bulk water: Water testing laboratories o Chlorine residual: at least 0.3 mg/L but not exceed General public 1.50 mg/L PREPARED BY: JAMEL S. MENDEZ, RMT 1  SAFE DRINKING WATER Chlorine dioxide residual: 0.2 to 0.4 mg/L prior to SECONDARY PARAMETERS distribution parameters that will render the water unacceptable for drinking CLASSIFICATION OF DRINKING-WATER QUALITY include operational parameters which affect the efficiency PARAMETERS of treatment processes MANDATORY PARAMETERS Minimum parameters required for examination by all drinking water service providers legally enforceable parameters directly affect health through acute or chronic exposure indicate the possible presence of other contaminants EMERGENCY DRINKING-WATER PARAMETERS exceed tolerable values on local monitoring data of the LGU shall provide temporary drinking water supply for 72 previous years hours Mandatory Drinking-Water Quality Parameters Water should be disinfected through boiling or Parameter MAXIMUM ALLOWABLE LEVEL chlorination Thermotolerant MTFT: < 1.1 MPN/ 100 mL Monitor Residual Cl2 (0.5-1.5) and E. coli/ThC Coliform/E. Coli EST: Absent or < 1 MPN/ 100 mL Regular monitoring shall resume after normal condition MFT: