Water is probably the most important natural resource, second only to air! While water is available in sufficient quantities for all human requirements, non-uniform distribution of water in different parts of the world and even within a country makes wise use of water and understanding water quality not only a necessity but the very crucial factor for day-to-day life and activities.
With the rising concentrated use of water in geographies like metropolitan cities and industrial zones, it has become absolutely necessary that we keenly monitor the quality of water that we use for different activities. Central Pollution Control Board(CPCB) has laid detailed guidelines about water quality and what industry needs to do measure and maintain it.
Before we actually look at water quality guidelines prescribed by CPCB (Central Pollution Control Board), it will be worthwhile to have a look at different parameters that define water quality.
Parameters are:
Now that we know the critical parameters for measuring water quality, let us have a look at how CPCB defines water fit for different activities.
CPCB categories water into 5 categories, namely A, B, C, D, and E.
The table below explains possible usage and quality guidelines for these types:
| Type | Usage | Guidelines |
| A | Drinking Water Source without conventional treatment but after disinfection | pH between 6.5 and 8.5
Dissolved oxygen 6mg/l or more. BOD 2mg/l or less. |
| B | Outdoor bathing (Organized) | Total Coliforms Organism MPN/100ml shall be 500 or less
pH between 6.5 and 8.5 Dissolved Oxygen 5mg/l or more BOD 3mg/l or less. |
| C | Drinking water source after conventional treatment and disinfection | Total Coliforms Organism MPN/100ml shall be 5000 or less
pH between 6 to 9 Dissolved Oxygen 4mg/l or more BOD 3 mg/l or less. |
| D | Propagation of Wildlife and Fisheries | pH between 6.5 to 8.5
DO 4mg/l or more. Free Ammonia 1.2 mg/l or less |
| E | Irrigation, Industrial Cooling, Controlled Waste disposal | pH between 6.0 to 8.5
Electrical Conductivity of Max 2250 micromhos/cm at 25 Degree C. Sodium absorption ratio of Max 26. Boron: maximum 2mg/l. |
Water which does not meet above criteria is classified as below E.
From the above table, it is quite clear that how important it is to monitor the quality of the water at the inlet and also at the point of discharge in any industry. This makes installing a Water Quality Monitoring System a must; not only to avoid legal implications but also to safeguard and ensure the well being of the community that we operate in.
