Community Health: Safe Drinking Water

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Questions and Answers

Where should water samples be examined?

Any laboratory

A laboratory accredited by PNRI

Food establishments

Only a DOH accredited laboratory (correct)

Who is authorized to collect water samples for regulatory purposes?

General public

Water testing laboratory personnel

DOH accredited laboratory personnel

Only certified sampling personnel (correct)

What is the standard reference for water and waste water examination?

22nd edition of Standard Methods (correct)

PNRI standards for drinking water quality

WHO guidelines for drinking water quality

21st edition of Standard Methods

Who is responsible for conducting sustainable development goals (SDG) water supply indicators?

Drinking water service providers Signup and view all the answers

What is the maximum TDS allowed in drinking water during emergency situations?

10 mg/L Signup and view all the answers

What is the minimum chlorine residual required at the point of delivery for mobile tanks?

0.5 mg/L Signup and view all the answers

Who is responsible for ensuring that water samples are collected and examined according to the standards?

Health and sanitation authorities Signup and view all the answers

What is the pH range allowed in drinking water during emergency situations?

5-7 Signup and view all the answers

What is the minimum acceptable level of chlorine dioxide residual in drinking water prior to distribution?

0.2 to 0.4 mg/L Signup and view all the answers

What is the purpose of monitoring the level of thermotolerant coliform in drinking water?

To indicate the possible presence of other contaminants Signup and view all the answers

What is the maximum allowable level of thermotolerant coliform in drinking water?

< 1.1 MPN/ 100 mL Signup and view all the answers

What is the primary purpose of mandatory drinking-water quality parameters?

To directly affect health through acute or chronic exposure Signup and view all the answers

What is the time frame for which the LGU shall provide temporary drinking water supply during an emergency?

72 hours Signup and view all the answers

What is the recommended method of disinfecting water during an emergency?

Boiling or chlorination Signup and view all the answers

What is the purpose of monitoring E. coli and thermotolerant coliform in drinking water?

To detect the presence of other contaminants Signup and view all the answers

What is the range of residual Cl2 that should be monitored during an emergency?

0.5-1.5 mg/L Signup and view all the answers

What are the three key components of the improved framework for drinking-water quality?

Health-based targets, a system of independent surveillance, and quality assurance Signup and view all the answers

What is the main objective of the Philippine National Standards for Drinking Water?

To achieve the MDG for water and sanitation Signup and view all the answers

What are the four parameters that drinking water quality shall be classified into?

Microbiological, physical, chemical, and radiological Signup and view all the answers

What is the year of the official launching of the Philippine National Standards for Drinking Water?

2017 Signup and view all the answers

What is the main reason for the revision of the 2007 Philippine National Standards for Drinking Water?

To address the experiences of water service providers in complying with standards Signup and view all the answers

What is the minimum requirement for water sampling and examination?

Initial and periodic examination Signup and view all the answers

What are the common water-borne diseases caused by parasites?

Cryptosporidiosis, giardiasis, and schistosomiasis Signup and view all the answers

What is the standard for drinking water quality in terms of taste, odor, and color?

Clear, free from objectionable taste, odor, and color Signup and view all the answers

What is the basis for the minimum number of samples required for water sampling and examination?

Source and mode of distribution Signup and view all the answers

What is the edition of the WHO Guidelines for Drinking-Water Quality that was released in 2011?

4th edition Signup and view all the answers

Study Notes

General Guidelines for Safe Drinking Water

The Philippine National Standards for Drinking Water (PNSDW) conform to the Administrative Order (AO) and its Manual of Operation.
The 2017 PNSDW has improved framework comprising 3 key components:
- Health-based targets
- A system of independent surveillance
- Specific guidelines

Revision of 2007 PNSDW

Reasons for revision:
- Experiences of water service providers in complying with standards
- WHO Guidelines for Drinking-Water Quality 4th edition, 2011
- DOH AO 2014-0027, Water Safety Plan for all drinking-water service providers
- Sustainable Development Goals (SDG) water supply indicators

Scope and Coverage

Drinking water service providers:
- Government and private developers and operators
- Bulk water, refilling station, vending machine operators
- Ice manufacturers
- Food establishments
- Residential, commercial, industrial, and institutional buildings
- Health and sanitation authorities
- Water testing laboratories
- General public

Classification of Drinking-Water Quality Parameters

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
- Exceed tolerable values on local monitoring data of the previous years
Parameters classified into:
- Microbiological
- Physical
- Chemical
- Radiological

Water-Borne Diseases

Common water-borne diseases:
- Parasites
- Bacteria
- Viruses

Standards for Drinking Water Quality

Water should be:
- Clear
- Free from objectionable taste, odor, and color
- Comply with standard values for microbiological, physical, chemical, and radiological parameters

Standards for Water Sampling and Examination

Initial and periodic examination:
- Microbiological
- Physical
- Chemical
- Radiological
Minimum number of samples based on source and mode of distribution
Collection of water samples:
- Comply with standard sampling requirements
- Only certified sampling personnel shall collect water samples for regulatory purposes
Examination of water samples:
- Only in DOH-accredited laboratories
- Methods based on 22nd edition of Standard Methods for the examination of water and waste water (SMEWW)

Standards for Other Modes of Distribution

Refilling stations:
- Initial and periodic examination
- Must meet sampling frequency
- Standard values for mandatory parameters shall be applied except for pH = 5-7 and TDS not exceeding 10 mg/L
Mobile tanks:
- Cl2 residual: at least 0.5 mg/L but not exceeding 1.50 mg/L at the point of delivery
Bulk water:
- Chlorine residual: at least 0.3 mg/L but not exceeding 1.50 mg/L
Chlorine dioxide residual: 0.2 to 0.4 mg/L prior to distribution

Emergency Drinking-Water Parameters

LGU shall provide temporary drinking water supply for 72 hours
Water should be disinfected through boiling or chlorination
Monitor Residual Cl2 (0.5-1.5) and E.coli/ThC

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Description

This quiz covers the general guidelines for safe drinking water, including standards and regulations outlined in the 2017 PNSDW. It's a part of the community and public health lecture.