According to the Central Ground Water Board, BIS (IS_10500 and revised module IS 10500:2012) specifications in the Uniform Drinking Water Quality Monitoring Protocol, what is the acceptable pH value of drinking water specification in India?
6.5 - 8.5
Understanding Drinking Water Quality: pH Value in India
Drinking water quality is crucial for public health. Various parameters are monitored to ensure water is safe for consumption. One important parameter is the pH value, which indicates how acidic or alkaline the water is.
What is pH and Why is it Important for Drinking Water?
The term pH stands for 'potential of Hydrogen'. It is a scale used to specify the acidity or basicity of an aqueous solution. Mathematically, pH is defined as the negative logarithm (base 10) of the hydrogen ion concentration:
\(\text{pH} = -\log_{10}[\text{H}^+]\)
The pH scale typically ranges from 0 to 14. A pH of 7 is neutral, a pH less than 7 is acidic, and a pH greater than 7 is alkaline (or basic).
For drinking water, pH affects several aspects:
- Taste: Extremely low or high pH can give water a metallic or soapy taste.
- Corrosion: Low pH (acidic water) can be corrosive to pipes and plumbing fixtures, potentially leaching harmful metals like lead and copper into the water.
- Effectiveness of Disinfection: The effectiveness of chlorine disinfection is dependent on pH.
- Aesthetic Quality: High pH can lead to scale formation in pipes and reduce the effectiveness of soap.
Indian Standards for Drinking Water Quality: BIS and CGWB
In India, the standards for drinking water quality are primarily set by the Bureau of Indian Standards (BIS). The key standard is IS 10500, which has been revised over time, with IS 10500:2012 being the current specification for drinking water. The Central Ground Water Board (CGWB) also refers to these standards in their guidelines, such as the Uniform Drinking Water Quality Monitoring Protocol.
These standards specify acceptable limits and permissible limits for various physical, chemical, and biological parameters of drinking water.
Acceptable pH Value According to BIS (IS 10500:2012)
According to the BIS standard IS 10500:2012 for drinking water, the acceptable limit for pH is specified. This range is considered safe and desirable for consumption based on health considerations and aesthetic properties.
The acceptable range for pH in drinking water as per BIS (IS 10500 and IS 10500:2012) specifications, and adopted in protocols like the Uniform Drinking Water Quality Monitoring Protocol by the Central Ground Water Board, is 6.5 to 8.5.
While there might be a 'permissible limit' outside this range under certain circumstances (e.g., if no alternative source is available), the 'acceptable limit' for pH is strictly 6.5 to 8.5.
Summary of pH Limit
| Parameter | Unit | Acceptable Limit (IS 10500:2012) | Permissible Limit in Absence of Alternate Source (IS 10500:2012) |
|---|---|---|---|
| pH | - | 6.5 - 8.5 | 6.5 - 9.2 |
The question specifically asks for the 'acceptable pH value' according to these specifications, which is 6.5 - 8.5.
Revision Table: Drinking Water Quality Standards
| Standard/Authority | Focus | Relevant Parameter (pH) |
|---|---|---|
| Bureau of Indian Standards (BIS) | Drinking water quality specifications | IS 10500:2012 defines acceptable and permissible limits for pH. |
| Central Ground Water Board (CGWB) | Monitoring and management of groundwater resources | Refers to BIS standards (IS 10500) for drinking water quality assessment in monitoring protocols. |
| Uniform Drinking Water Quality Monitoring Protocol | Guidelines for monitoring water quality across India | Specifies parameters and methodologies based on BIS standards like IS 10500. |
Additional Information: Other Drinking Water Parameters
Besides pH, the BIS standard IS 10500:2012 specifies limits for many other parameters to ensure drinking water safety. Some of these include:
- Turbidity
- Total Dissolved Solids (TDS)
- Hardness
- Alkalinity
- Chlorides
- Sulphates
- Nitrates
- Fluoride
- Various heavy metals (like Arsenic, Lead, Mercury)
- Bacteriological parameters (like E. coli)
Regular monitoring of these parameters is essential to maintain drinking water quality as per the prescribed standards.
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