Blog

You filter your water. Maybe you've invested in a reverse osmosis system, or you rely on bottled water because it feels safer. Here is something the label on that bottle won't say: studies consistently show that bottled water contains more microplastics than tap water — sometimes by a factor of two to four times.

This is not alarmism. It is a finding from peer-reviewed research, and it represents just one of many uncomfortable truths emerging from the growing science of microplastic contamination in drinking water.

What makes microplastics particularly challenging is that they are invisible to the naked eye, resistant to conventional water treatment, and increasingly being found in places they were never supposed to reach — human blood, lung tissue, and even the placenta of unborn children.

For anyone responsible for water quality in India — whether you manage a municipal supply, run a food or beverage operation, oversee industrial drinking water, or simply want to understand what is in the water your household consumes — this guide covers what current science and laboratory testing are actually finding. SKAS Lab (Shree Krishna Analytical Services) is a NABL-accredited water quality testing laboratory in India providing analytical services for industries, food businesses, and environmental compliance programmes across the country.

What Are Microplastics And What Most Articles Get Wrong

The standard definition: microplastics are plastic particles smaller than 5mm in any dimension. Anything below 1 micrometre (0.001mm) is technically classified as a nanoplastic.

Most mainstream coverage stops there. But the size classification matters enormously for health risk assessment, and here is why:

Nanoplastics are the ones that keep toxicologists up at night. At sub-micrometre sizes, plastic particles can cross biological barriers that larger particles cannot — including the blood-brain barrier and the placental barrier. A 2020 study published in Environment International detected microplastics in human placentas for the first time. A 2022 study found them in human blood.

Standard water filtration systems — including most RO units — were designed for dissolved minerals and bacteria. They were not designed for particles in the nanometre range. This is why microplastics in drinking water testing requires specialised laboratory methods, not just a standard water quality report.

Where Do Microplastics in Drinking Water Come From?

Understanding the contamination pathway is the first step toward addressing it. There are several entry points — some obvious, some that are almost never discussed.

1. The Plastic Pipe Paradox (India's Hidden Source)

India's municipal water distribution infrastructure is aging. A significant portion of the pipe network in Indian cities uses PVC, HDPE, or other plastic pipes that degrade over time. When these pipes experience pressure fluctuations, chemical disinfectants, heat stress, or simply the passage of decades, they shed particles directly into the water flowing through them.

This means the contamination can happen after treatment — between the water treatment plant and your tap. A study of water distribution systems in multiple countries found that plastic pipes were a significant and often overlooked contributor to microplastic loads in tap water.

For India, where pipe replacement timelines are long and distribution networks are under constant pressure from expanding urban populations, this is a particularly relevant concern.

2. Bottled Water — The Contamination You Pay For

A landmark 2018 study by researchers at SUNY Fredonia, commissioned by Orb Media, tested 259 bottled water samples from 11 brands across 9 countries. The results found plastic particles in 93% of all samples tested.

The primary source: the bottling and capping process itself. Plastic caps, bottle necks, and the bottling machinery shed particles directly into the water during filling. A second source is the bottle itself — particularly single-use PET bottles stored in heat (direct sunlight, hot delivery vehicles, warm warehouses), which accelerates plastic leaching.

The specific polymers most commonly found in bottled water: polypropylene (from bottle caps), nylon, and polyethylene terephthalate (PET) from the bottle body.

3. Atmospheric Deposition (Rain and Air Carry Plastics Too)

Microplastics are now present in the atmosphere. They travel long distances on air currents and deposit on open water sources through rainfall. Research published in Nature Geoscience found microplastics falling in rain in the remote French Pyrenees — far from any industrial source.

In India, atmospheric plastic pollution is significantly higher in urban centres. Monsoon rainfall, which replenishes reservoirs and groundwater, also deposits accumulated atmospheric microplastics into these water sources.

4. Agricultural Runoff

India's agricultural sector uses plastic mulch films, irrigation tubing, greenhouse plastics, and plastic-coated fertiliser bags. Over time, these degrade into microplastic fragments that contaminate soil and then migrate into groundwater and surface water through irrigation runoff and rainfall.

Pesticide-coated microplastics — plastic particles that carry pesticide residues on their surface — have been detected in water sources near intensive farming zones. This creates a dual contamination problem that standard water tests (which focus on dissolved pesticide residues, not particulate-bound ones) can miss entirely.

5. Wastewater Treatment Plant Effluents

Conventional wastewater treatment plants are effective at removing large plastics but struggle with microplastics below 10 micrometres. Studies suggest that modern treatment plants remove 90–99% of microplastics — which sounds impressive until you realise that the remaining 0.1–1% from millions of litres of daily wastewater still represents enormous particle counts entering rivers and water bodies.

In India, where many treatment plants are at capacity or underperforming, the effective removal rate is likely lower.

6. Synthetic Textile Washing

Every time a synthetic garment (polyester, nylon, acrylic) is washed, it sheds thousands of microfibres into the wastewater stream. A single wash cycle can release over 700,000 plastic fibres. These fibres are long and thin — a shape that makes them particularly difficult to capture in treatment systems — and they end up in rivers, groundwater, and eventually drinking water.

Synthetic fibre microfibres are among the most commonly detected microplastic types in freshwater samples worldwide.

Health Risks: What the Research Actually Says

The health science of microplastics is evolving rapidly. Here is an honest summary of what is currently known, what is suspected, and what remains under investigation.

Confirmed: Physical Presence in Human Tissue

Microplastics have now been confirmed in:

• Human blood (2022, Environment International)
• Human lung tissue, including deep lung (2022, Science of the Total Environment)
• Human placenta (2020, Environment International)
• Human stool (2018, multiple studies)
• Human liver and spleen tissue (2021)

These are not studies suggesting theoretical exposure. These are studies finding actual plastic particles in actual human tissue samples. This is a new category of environmental contamination for which we have no historical precedent and no established safety threshold.

Suspected: Endocrine Disruption

Several plastic polymer additives — including bisphenol A (BPA), phthalates, and certain flame retardants — are known endocrine disruptors. These chemicals can leach from plastic particles once inside the body. Endocrine disruptors interfere with hormonal signalling and have been linked to reproductive disorders, developmental issues in children, metabolic dysfunction, and thyroid irregularities.

Suspected: Gut Microbiome Disruption

Emerging research suggests that microplastics alter the composition of gut microbiota. Animal studies show changes in gut flora, inflammatory markers, and intestinal permeability — a condition linked to autoimmune conditions and metabolic disease — following microplastic exposure. Human studies are limited but ongoing.

Suspected: Carrier Effect for Chemical Contaminants

Microplastics act as vectors — they attract and concentrate organic pollutants, heavy metals, and persistent organic pollutants (POPs) on their surface. When a microplastic particle carrying adsorbed contaminants enters the body, it may release these concentrated chemicals at the gut lining — a site where direct exposure would not otherwise occur.

The Honest Caveat

The WHO's 2019 report on microplastics in drinking water acknowledged that current evidence is insufficient to draw definitive conclusions about risk thresholds. However, the same report also recommended that immediate action be taken to reduce plastic pollution — both out of precaution and because the research trajectory is clearly pointing toward harm.

India's Regulatory Gap: The Problem No One Is Addressing

Here is something practically no article about microplastics in India mentions: India currently has no regulatory standard for microplastics in drinking water.

The Bureau of Indian Standards (BIS) IS 10500:2012 — India's primary standard for drinking water quality — does not include microplastics among its tested parameters. FSSAI regulations for packaged water (IS 14543) are similarly silent on the issue.

This means:

• Water suppliers in India are not legally required to test for microplastics
• There is no permissible limit that, if exceeded, requires remedial action
• Consumers and businesses have no regulatory benchmark to compare results against

This regulatory vacuum creates two risks. First, the population is exposed to an unmonitored contaminant with no public health response mechanism in place. Second, businesses — particularly food and beverage manufacturers, pharmaceutical water users, and packaged water brands — have no clear compliance framework to work within.

For comparison, the European Commission has been developing a regulatory approach to microplastics under the Water Framework Directive, and the US EPA has added microplastics to its monitoring priorities under the Safe Drinking Water Act. India's policy response has not kept pace.

How Laboratories Detect Microplastics in Water: The Science Behind the Test

This is an area where significant scientific rigour is required and where the choice of laboratory methodology matters enormously. Not all microplastic testing is equal.

Step 1: Sample Collection and Preservation

Microplastic testing begins before the sample reaches the lab. Collection must use glass containers, not plastic — because plastic sampling equipment would contaminate the sample. Samples are typically large volume (1–5 litres) because microplastic concentrations in water can be very low. Strict protocols govern transport and chain of custody.

Step 2: Filtration and Isolation

In the laboratory, the water sample is filtered through stacked filters of decreasing pore size — typically 5µm, 1µm, and 0.45µm — to capture particles across the microplastic size range. The filter material itself must be non-plastic (typically stainless steel mesh or glass fibre).

Organic matter is then removed using hydrogen peroxide digestion or enzymatic digestion, leaving only the plastic particles for analysis.

Step 3: Particle Identification — The Three Key Methods

• FTIR Spectroscopy (Fourier Transform Infrared Spectroscopy) — This is the current gold standard for microplastic identification. FTIR works by measuring how a particle absorbs infrared light, producing a spectral "fingerprint" that is compared against polymer databases. It can identify the specific type of plastic (polyethylene, polypropylene, polystyrene, nylon, PET, etc.) and, with micro-FTIR, can analyse particles as small as 10–20 micrometres.
• Raman Spectroscopy — Raman offers higher spatial resolution than FTIR and can detect smaller particles down to 1 micrometre. It is particularly useful for analysing microfibres. However, it is more susceptible to interference from fluorescent organic matter, making sample preparation critical.
• Pyrolysis-GC/MS (Pyrolysis Gas Chromatography-Mass Spectrometry) — Pyrolysis-GC/MS decomposes plastic particles at high temperature and analyses the breakdown products to identify polymer type and quantify total plastic mass. It is highly sensitive and can detect nanoplastics, but it destroys the sample in the process, so it cannot be used alongside particle counting. Best for total mass quantification rather than individual particle characterisation.

Step 4: Quantification and Reporting

Laboratory results express microplastic contamination as:

• Particle count per litre (particles/L) — most common
• Mass per litre (µg/L or mg/L) — for Pyrolysis-GC/MS results
• Fibre count separate from fragment count — fibres and fragments have different environmental and health profiles

A comprehensive microplastic testing report should include: polymer types identified, particle size distribution, particle count per litre, morphology (fragment, fibre, film, bead), and colour distribution.

Can Your Current Water Filter Remove Microplastics?

This is one of the most practically useful questions — and the answer is more nuanced than most filter manufacturers will tell you.

The practical takeaway: a high-quality RO system with a tight membrane specification removes the majority of microplastics. However, if your concern is nanoplastics, or if your RO membranes are degraded or incorrectly maintained, the protection is incomplete. And critically — if your post-RO distribution uses plastic tubing, recontamination is possible.

Who Should Be Testing for Microplastics in India?

While individual household testing is useful for peace of mind, the following organisations have the strongest business and compliance reasons to conduct regular potable water testing for microplastics:

• Packaged drinking water brands — consumer trust, brand differentiation, and anticipated regulatory requirements
• Food and beverage manufacturers — process water quality directly affects product quality; microplastics in process water end up in food products
• Pharmaceutical manufacturers — water purity standards are exceptionally high; microplastics are an emerging quality concern
• Hospitals and healthcare facilities — patient vulnerability makes water quality a priority
• Hotels and hospitality — guest-facing water quality, kitchen and beverage preparation
• Industrial plants with employee drinking water supply — duty of care to workforce
• Research institutions and environmental agencies — baseline monitoring and policy data

All of these sectors have one thing in common: they need test data that is scientifically defensible and issued by an accredited source. SKAS Lab's environmental and water contamination testing services are structured specifically to serve these requirements — covering water quality parameters from heavy metals and microbiological load to emerging contaminants like pesticide-bound particulates.

SKAS Lab: Environmental Water Testing with Scientific Rigour

SKAS Lab (Shree Krishna Analytical Services) is a NABL-accredited laboratory in New Delhi providing environmental and water quality testing services for industries, institutions, and regulatory compliance programmes across India.

Our environmental testing capabilities cover a broad spectrum of water quality parameters — from conventional physical and chemical parameters to emerging contaminants including microbiological indicators, heavy metals, and trace organic pollutants. We work with food and beverage manufacturers, pharmaceutical plants, infrastructure projects, and environmental consultants who require defensible, accredited test data.

Accreditation is not just a certificate on the wall. It is the difference between a report that is accepted by regulators, buyers, and export authorities — and one that isn't. For a clear breakdown of what that means in practice, read our guide on why NABL-accredited lab reports carry more weight than non-accredited testing.

For specific testing requirements or to discuss a water quality monitoring programme, the team is available through the SKAS Lab water testing inquiry and consultation page.

What Current Research Is Telling Us — And What Comes Next

The pace of microplastic research is accelerating. Here are developments from the last few years that will shape how laboratories and regulators approach this issue:

• The WHO's position is hardening. The WHO's initial 2019 assessment called for more research while recommending precautionary reduction of plastic pollution. Subsequent WHO guidance has strengthened the call for monitoring and source control.
• UNEP's Global Plastics Treaty. The United Nations Environment Programme has been coordinating a binding global treaty on plastic pollution, with monitoring requirements for water systems forming part of the discussions. Once finalised, this will exert pressure on national regulators — including India — to develop domestic standards.
• The nanoplastics frontier. Current analytical methods are still limited in their ability to reliably characterise and quantify particles below 1 micrometre. The next phase of laboratory method development will focus on closing this gap, and the health risk picture will likely look significantly more serious once nanoplastic data becomes routinely available.
• India's first river microplastic studies. Peer-reviewed research on the Ganga, Yamuna, and Cauvery rivers has begun documenting microplastic loads. This data will likely form the baseline when Indian regulators eventually develop water quality standards for microplastics.

Frequently Asked Questions

Q1. What exactly are microplastics and where do they come from in drinking water?

Microplastics are plastic particles smaller than 5mm. In drinking water, they originate from degrading plastic pipes, bottling and packaging processes, atmospheric deposition, agricultural runoff, synthetic textile washing, and incomplete removal in water treatment plants.

Q2. Is bottled water safer than tap water when it comes to microplastics?

Surprisingly, no — or at least not necessarily. Multiple studies have found higher microplastic concentrations in commercially bottled water than in treated tap water. The bottling and capping process itself is a significant contamination source.

Q3. Can a standard RO filter remove microplastics from water?

A high-quality RO system removes the majority of microplastic particles. However, standard RO membranes may not capture all nanoplastics, and post-RO plastic components can reintroduce contamination. UV and carbon filters alone do not remove microplastics.

Q4. Does India have any regulatory limit for microplastics in drinking water?

No. As of 2026, neither BIS IS 10500 (tap water standard) nor FSSAI IS 14543 (packaged drinking water standard) includes microplastics as a regulated parameter. India currently has no permissible limit for microplastics in any category of drinking water.

Q5. What laboratory method is most reliable for detecting microplastics in water?

FTIR (Fourier Transform Infrared) Spectroscopy is currently considered the gold standard for identifying polymer types in water samples. Raman Spectroscopy is used for smaller particles, and Pyrolysis-GC/MS is used for total plastic mass quantification.

Q6. Are microplastics harmful to human health?

Current research confirms that microplastics accumulate in human tissue including blood, lungs, and the placenta. Several plastic additives are known endocrine disruptors. The full health consequences are still being studied, but the scientific consensus is moving steadily toward concern, and the WHO has called for precautionary action.

Q7. Who in India should be testing their water for microplastics?

Food and beverage manufacturers, packaged water brands, pharmaceutical manufacturers, hospitals, large hotels, and industrial facilities with employee water supply all have strong reasons to test proactively — both for quality assurance and in anticipation of regulatory requirements that are expected to emerge.

Q8. How do I arrange microplastic or water quality testing with SKAS Lab?

Reach the SKAS Lab team through the water testing inquiry and consultation page. The team will guide you on sample collection protocols, parameters, turnaround times, and what the report will cover.

Conclusion

Microplastics in drinking water are not a future threat to be worried about eventually. They are a present reality confirmed by laboratory analysis across the globe — including in the packaged water you buy at the store and the tap water flowing through aging urban pipe networks.

India faces this challenge with an additional difficulty: no regulatory framework currently exists to monitor, limit, or respond to microplastic contamination in drinking water. That leaves the responsibility with businesses, manufacturers, and institutions that understand the science and choose to act ahead of regulation.

The science is moving fast. Regulatory response will follow. The businesses and institutions that begin testing and monitoring now will be better positioned for quality, for compliance, and for the trust of the people who consume their products or depend on their water systems.

If understanding what is actually in your water matters to you, the right starting point is accurate, accredited laboratory analysis.

Stay connected with SKAS Lab for updates on environmental testing, water quality science, and laboratory insights on Facebook and LinkedIn.