Unveiling the World of RO Drinking Water: WHO Standards and Parameters


In an era where water quality is of paramount importance, Reverse Osmosis (RO) drinking water
has emerged as a frontrunner in ensuring safe and clean hydration. But how do we know that the
RO water we consume meets the highest standards? In this blog, we’ll explore the meticulous
guidelines set by the World Health Organization (WHO) for RO drinking water, along with the
specific parameters that define its purity and safety.

purified water

Understanding RO Drinking Water:

Reverse Osmosis is a powerful filtration process that employs a semi-permeable membrane to
remove contaminants, particles, and impurities from water. This process has gained popularity as
an effective means of providing households and communities with cleaner, safer drinking water.

mineral water

Why WHO Standards Matter:

The WHO, a global authority on public health, sets forth stringent guidelines for drinking water
quality to safeguard human health. These guidelines encompass a comprehensive array of
parameters that water sources must adhere to, ensuring that the water we consume is free from
harmful substances.

Water purifier

Key Parameters and Standards:

1. Microbiological Parameters:

– Total Coliforms: The absence of total coliform bacteria in 100 mL of water is a
fundamental requirement, indicating that the water is free from faecal contamination.
– Escherichia coli (E. coli):The absence of E. coli in 100 mL of water is crucial, as its
presence suggests potential faecal contamination and the risk of waterborne diseases.

RO water

2. Chemical Parameters:

– Arsenic: The concentration of arsenic should not exceed 0.01 mg/L to prevent long-term
health risks associated with its ingestion.
– Fluoride: The fluoride concentration should not surpass 1.5 mg/L, depending on the
climate, to prevent dental and skeletal fluorosis.
– Nitrate: The nitrate concentration should not exceed 50 mg/L (as NO3-) to prevent health
risks, especially for infants and pregnant women.
– Lead: The lead concentration should remain below 0.01 mg/L, as lead exposure can lead
to severe health issues.

3. Physical and Inorganic Chemical Parameters:

– Turbidity: Turbidity should not exceed 5 NTU, ensuring the water’s clarity and absence of
particulate matter.
– Colour: While colour is not specified, it should not indicate contamination.
– Odour and Taste: The water should be acceptable in terms of odour and taste for

water purifier RO

4. Organic and Radiological Parameters:

– Various organic chemical parameters, such as benzene, carbon tetrachloride, and chloroform,
should remain below specific concentrations.
– Radiological parameters like gross alpha and gross beta activity should also meet defined


As we raise our glasses of RO drinking water, we can do so with confidence, knowing that the
World Health Organization’s meticulous standards are being upheld. The parameters set by the
WHO serve as a beacon of assurance, guiding us toward a healthier, safer, and purer drinking
water source. Whether it’s eliminating harmful bacteria or reducing the presence of
contaminants, RO drinking water aligns with these standards to provide us with a vital resource
that promotes well-being. As consumers, understanding these parameters empowers us to make
informed choices about the water we consume, ensuring that it meets the highest benchmarks of
safety and quality.