When a pilgrim cups water from the Ganga at Haridwar, they are performing an act of faith as old as recorded Indian civilization.
They are also, according to research published in 2025, consuming microplastics.
Not somewhere in the polluted lower plains — but at Haridwar, one of the most sacred of all pilgrimage sites, where the Ganga descends from the Himalayas into the plains. Where the water runs faster and cleaner than almost anywhere downstream. Where rivers are still cold, still clear, still green.
Even there, the newest science says, microplastic particles are present at concentrations between 100 and 1,550 particles per litre of water.
This is the dimension of the Ganga’s environmental crisis that receives the least attention and carries some of the most troubling long-term implications — not the visible sewage that turns the water brown at Kanpur or the industrial froth that coats the riverbanks near tanneries, but the invisible contamination that no sewage treatment plant is designed to remove, that persists indefinitely in river sediments, and that is now moving from the river into the bodies of fish, dolphins, and the people who eat them.
This is the story of what new research is finding inside the Ganga — and what it means for the river, for its wildlife, and for the hundreds of millions of people who depend on its water.
What Microplastics Are — and Why the Ganga Has So Many
Microplastics are plastic particles smaller than 5 millimetres. They enter rivers through multiple pathways: from the breakdown of larger plastic waste dumped on riverbanks or swept in by floods, from industrial wastewater and urban sewage that carries plastic fibres from synthetic clothing and packaging, from agricultural plastic mulch and fertilizer bags that wash into tributaries, and from the ritual practices that release enormous quantities of plastic into the Ganga’s waters during festivals and cremation ceremonies.
A systematic review published in IWA Publishing’s Water Supply journal in February 2025 examined microplastic pathways in the Ganga, finding that key sources include urban and industrial wastewater discharge, agricultural runoff laden with plastic mulch and contaminated fertilizers, and inadequate solid waste management. The review also identified atmospheric deposition — microplastics carried from urban centers through the air — as a significant transport pathway into the river.
The Ganga receives plastic from sources that span its entire 2,525-kilometre length. But what makes the 2025 and 2026 research so significant is where the microplastics are now being found — and in what concentrations.
A first-of-its-kind study from Doon University, published in Science of the Total Environment in March 2025, quantified microplastic abundance in the upper Himalayan stretch of the Ganga at 19 sites across Devprayag, Rishikesh, and Haridwar. The study found microplastic concentrations between 100 and 1,550 particles per litre in water samples and between 50 and 1,300 particles per kilogram in sediment samples — with the potential ecological risk assessment exceeding 1,200 at most monitoring stations.
A potential ecological risk score above 1,200 is classified in environmental science literature as “very high risk” to aquatic organisms. This is the upper Himalayan Ganga — the stretch that most Indians consider the purest, the most sacred, and the most environmentally protected section of the river.
| Location | MP in Water (particles/L) | Risk Category |
|---|---|---|
| Devprayag (Zone I) | 100–800 | High |
| Rishikesh (Zone II) | 300–1,200 | Very High |
| Haridwar (Zone III) | 500–1,550 | Very High (>1,200) |
| Varanasi (mid-Ganga) | Significantly higher | Critical |
| Lower estuarine stretch | Present across all tributaries | Widespread |
The Invisible Pathway: From River to Groundwater to Food
The microplastic crisis in the Ganga is not confined to the river itself. One of the most alarming findings of recent research is the pathway through which these particles are moving from the river into the groundwater that hundreds of millions of people drink every day.
A 2025 study published in the Journal of Contaminant Hydrology examined how microplastics from the Ganga may be infiltrating groundwater across the Indo-Gangetic Floodplain. The research found that floodwaters can transport microplastics downstream, posing risks to major cities including Patna and Kolkata along the floodplain. The study noted that despite densely populated regions’ heavy reliance on groundwater for drinking — approximately 80 percent of domestic water requirements and over 45 percent of total irrigation needs — research on microplastic transport through surface-groundwater interactions in India remains severely limited.
This is the gap that makes the microplastic problem particularly difficult to manage. Sewage treatment plants can theoretically reduce bacterial contamination. Industrial effluent standards can reduce heavy metal discharge. But microplastics, once in the river sediment, do not degrade — they accumulate. And when floodwaters rise, they spread across agricultural land and filter downward into the aquifer systems that supply drinking water to cities that have no idea the contamination is occurring.
A review published in the Proceedings of the Indian National Science Academy in November 2025 estimated that 60 percent of fish species in the Ganga are ingesting microplastics, and noted that the Gangetic dolphin has experienced a 25 percent population decline over the past decade attributable in part to plastic exposure. The review also documented over 5,000 annual waterborne disease cases linked to Ganga contamination, and estimated a 20 percent decline in fisheries productivity — a direct economic blow to the communities that depend on the river for income.
0.6 Million Tonnes: The Plastic Load Entering the Bay of Bengal
The Ganga is not simply a river that carries pollution within India. It is one of the world’s most significant conduits of plastic from land to ocean.
The Ganga River, described as a critical lifeline for over 400 million people, carries an estimated 0.6 million tonnes of plastic pollution annually. This plastic travels from cities, industrial areas, and agricultural zones across five Indian states before entering the Bay of Bengal — contributing to the marine plastic crisis that affects fisheries, marine mammals, and ocean ecosystems across the entire Indian Ocean region.
According to research, rivers are the main source of marine plastic pollution, releasing between 0.47 and 2.75 million tonnes of plastic into oceans annually. The Ganges is consistently identified as one of ten major rivers globally that together account for 93 percent of all riverine plastic entering the ocean — alongside the Yangtze, Yellow, Hai, Pearl, Amur, Mekong, Niger, Nile, and Indus.
This means that cleaning the Ganga is not only an Indian environmental priority — it is a global ocean health issue. Every tonne of plastic removed from the Ganga before it reaches the Bay of Bengal is a tonne that will not accumulate in marine food chains, will not entangle sea turtles and dolphins, and will not fragment into the nanoplastics that are now found in every monitored ocean system on Earth.
The Wildlife Cost: What Plastic Is Doing to the Ganga’s Animals
The Ganga supports what researchers describe as approximately 2,000 aquatic species — including 143 fish species, freshwater turtles, smooth-coated otters, and two of India’s most internationally recognized endangered animals: the Gangetic river dolphin and the gharial.
Both are now facing plastic-related threats on top of the pollution and habitat pressures they already endure.
The Gangetic Dolphin and Ghost Fishing Gear
A 2025 MDPI study mapping plastic distribution in the Ganga’s high-biodiversity zone in Sahibganj, Jharkhand found that 72.9 percent of all fishing-related debris recorded was ghost fishing gear — abandoned or lost nets and lines that continue to trap and kill aquatic animals indefinitely. The study identified this as a heightened entanglement risk specifically for apex species including the Gangetic dolphin and smooth-coated otter.
Ghost fishing gear is one of the most lethal forms of plastic pollution for air-breathing aquatic mammals. A Gangetic dolphin caught in an abandoned net cannot surface to breathe. It drowns. Unlike deliberate hunting — which can be deterred through enforcement and awareness — ghost gear operates silently and continuously, long after the fisherman who lost it has moved on.
The bioaccumulation of microplastics in zooplankton, benthic invertebrates, and fish disrupts trophic interactions, propagating adverse effects throughout the aquatic food web. Plastic debris also alters sediment composition and impedes oxygen exchange in river beds, exacerbating ecological threats to bottom-dwelling species.
Fish: 60 Percent Are Eating Plastic
The statistic that 60 percent of Ganga fish species are ingesting microplastics carries implications that extend from the river’s ecology into the kitchens of the fishing communities along its banks.
Studies have documented microplastic presence in various species within the Ganga, highlighting risks for both wildlife and human health. Aquatic organisms including fish and invertebrates often ingest microplastics, mistaking them for food. This ingestion results in physical harm and chemical exposure, with the potential for toxins to bioaccumulate — disrupting food webs and biodiversity. Microplastic particles also adsorb harmful pollutants such as heavy metals and persistent organic chemicals, which intensifies their toxicological effects.
This is the bioaccumulation pathway: microplastics attract and concentrate chemical pollutants already present in the water — chromium from tanneries, lead from industrial discharge, pesticides from agricultural runoff. A fish ingesting microplastics is not just ingesting plastic. It is ingesting a particle that has acted as a chemical sponge, concentrating toxins at levels far higher than those present in the surrounding water. When humans eat that fish, they absorb those concentrated toxins.
Emerging contaminants in Ganga water include phthalates at 10–15 micrograms per litre, heavy metals including lead at 5–10 micrograms per gram, and microbial pathogens. Human health impacts documented in research include a 10 percent higher incidence of reproductive issues among communities dependent on Ganga water, and over 5,000 annual waterborne disease cases.
The Tributaries Are Carrying It Too
A critical finding of 2025 and 2026 research is that microplastic contamination in the Ganga cannot be addressed by focusing on the main channel alone. The river’s tributaries — which drain into the Ganga from across its vast basin — are themselves heavily contaminated.
Research published in Marine Pollution Bulletin in January 2026 by ICAR’s Central Inland Fisheries Research Institute investigated microplastic prevalence across eight major tributaries and distributaries of the Ganga at the lower estuarine stretch — including the Jalangi, Haldi, Matla, Ichamati, Adi Ganga, Rupnarayan, Churni, and Damodar rivers. The study found microplastic pollution present across all monitored tributaries, confirming that contamination extends throughout the Ganga’s lower estuarine network.
This finding matters enormously for cleanup strategy. The Namami Gange Programme has historically focused investment on the main Ganga channel — sewage treatment plants in major cities, river surface cleaning, ghat restoration. But if the tributaries feeding the main channel are themselves carrying heavy microplastic loads, cleaning the main channel without addressing tributary contamination is like mopping the floor while the tap runs.
The Yamuna — the Ganga’s largest tributary, which joins at Prayagraj — is itself one of India’s most polluted rivers. Research on the Yamuna found microplastic abundances ranging from 148 to 2,120 particles per litre in water and 282 to 2,705 particles per kilogram in sediment — with microplastics including fibres and fragments composed of polyethylene, polypropylene, and polystyrene. Every litre of Yamuna water entering the Ganga at Prayagraj carries this plastic load with it — contaminating one of Hinduism’s most sacred confluence points.
The Regulation Gap: Why Existing Systems Are Not Catching This
India has strengthened its plastic regulation framework in recent years. The 2022 single-use plastic ban covers a significant range of common plastic items. The Namami Gange Programme includes river surface cleaning as a component. Industrial effluent standards regulate toxic discharge.
None of these frameworks are designed to address microplastic contamination at the scale and specificity the current research reveals.
Challenges in addressing the Ganga’s microplastic crisis include inconsistent microplastic sampling protocols, low waste treatment rates of around 30 percent, and weak regulatory enforcement with only 20 percent compliance among regulated entities.
The sewage treatment plants that Namami Gange has built across the basin are designed to reduce biological oxygen demand and bacterial contamination. Standard sewage treatment processes are not effective at removing microplastics — particles small enough to pass through filtration membranes designed for a different category of contaminant. Even fully functioning STPs discharge microplastic-contaminated effluent into the river.
One major factor contributing to high levels of microplastic pollution in rivers is the inadequate removal of microplastics during treatment processes in wastewater treatment plants, along with the release of microplastics contained in sewage from urban areas into river systems.
This is the regulatory blind spot. India has invested heavily in sewage treatment infrastructure — and that investment is genuinely valuable for reducing bacterial contamination and BOD. But the same infrastructure does nothing for microplastics. A river with a functioning sewage treatment plant can simultaneously show improved biological oxygen demand levels and worsening microplastic contamination. Both statements can be true at the same time.
The Religious Dimension: Pollution From Devotion
One aspect of Ganga plastic pollution that scientific literature acknowledges but that policy frameworks rarely address directly is the contribution of religious practice.
Hundreds of millions of pilgrimages, festivals, and daily rituals along the Ganga involve the offering of flowers, diyas, incense sticks, and sacred items — many packaged in plastic, many incorporating non-biodegradable materials, and many released directly into the river as part of the ritual act.
During major festivals — Kumbh Mela, Chhath Puja, Makar Sankranti — the volume of ritual offerings entering the Ganga over a period of days runs into millions of items. A significant proportion is plastic or plastic-packaged.
The cultural and religious significance of the Ganga contributes to plastic pollution through ritual practices and mass gatherings, with atmospheric deposition also playing a significant role in transporting plastics from urban centers near pilgrimage sites to the river.
This is an exceptionally delicate policy area. The Ganga’s religious significance is inseparable from its cultural identity. Any intervention that appears to restrict or commercialize pilgrimage practice faces fierce resistance. Yet the cumulative plastic load from ritual offerings is measurable and significant — and it is entering the river at precisely the sites where the water is considered most sacred and most likely to be consumed by devotees.
Several state governments have attempted ghat-level plastic collection programmes. Some pilgrimage organizations have moved toward biodegradable packaging for ritual items. But the scale of the challenge — millions of offerings at hundreds of ghats across thousands of annual festivals — means that voluntary and local initiatives have not come close to matching the rate at which plastic enters the river through religious practice.
What Genuinely Addressing the Microplastic Crisis Would Require
The 2025 research points consistently toward a set of interventions that go beyond the current Namami Gange framework.
Advanced tertiary treatment in STPs. Standard biological sewage treatment does not remove microplastics. Tertiary treatment technologies — including ultrafiltration, activated carbon filters, and coagulation processes — can significantly reduce microplastic discharge from treatment plants. The cost is substantially higher. But without it, every functioning STP is also a microplastic discharge point.
Tributary-inclusive cleanup strategy. Namami Gange Mission-II must address the Yamuna, Kosi, Ghaghra, Son, and other major tributaries as integrated components of the basin cleanup — not as separate rivers managed by separate state programmes. The Ganga is only as clean as the rivers feeding it.
Mandatory microplastic monitoring with public reporting. India does not currently have a standardized, publicly accessible microplastic monitoring programme for the Ganga. CPCB water quality data covers bacterial contamination, BOD, and dissolved oxygen. It does not cover microplastic concentrations. Without monitoring, there is no accountability.
Biodegradable alternatives for ritual practice. Government and religious institution partnerships to replace plastic packaging in pilgrimage retail — through subsidized biodegradable alternatives and ghat-level collection systems — could reduce one of the largest unmanaged plastic inputs to the river.
Ghost gear retrieval programme. A systematic programme for recovering abandoned fishing nets and lines from the Ganga’s high-biodiversity zones — partnering with fishing communities who know where nets are lost — would directly reduce one of the most lethal threats to Gangetic dolphins and otters.
Frequently Asked Questions
Q: Are microplastics found throughout the Ganga, including the upper Himalayan stretches?
Yes. Research published in March 2025 from Doon University found microplastic concentrations between 100 and 1,550 particles per litre even in the upper Himalayan Ganga at Devprayag, Rishikesh, and Haridwar — sites considered among the purest stretches of the river. Potential ecological risk scores exceeded 1,200 (classified as “very high”) at most monitored stations.
Q: How much plastic does the Ganga carry into the ocean?
The Ganga carries an estimated 0.6 million tonnes of plastic annually into the Bay of Bengal. It is consistently identified in global research as one of ten rivers that together account for 93 percent of all riverine plastic entering the world’s oceans — alongside the Yangtze, Yellow, Mekong, Niger, and Nile rivers.
Q: Are Ganga fish safe to eat given microplastic contamination?
Research published in 2025 found that approximately 60 percent of fish species in the Ganga are ingesting microplastics. These particles accumulate toxins — including heavy metals and persistent organic chemicals — from the water and transfer them through the food chain. There is no established safe consumption guideline specifically for Ganga fish. Communities dependent on river fish for nutrition and income face both health and economic risks from this contamination.
Q: Do sewage treatment plants remove microplastics from the Ganga?
Standard biological sewage treatment processes — which are what Namami Gange has primarily funded — are not effective at removing microplastics. These particles are small enough to pass through standard filtration systems. Advanced tertiary treatment technologies can reduce microplastic discharge, but they are significantly more expensive and have not been mandated under existing Namami Gange standards.
Q: How does religious practice contribute to Ganga plastic pollution?
Ritual offerings during festivals and daily pilgrimage activity introduce significant volumes of plastic into the Ganga — through plastic-packaged flowers, diyas, incense, and offerings released directly into the river. During major festivals involving millions of pilgrims, the cumulative plastic load is substantial. Several state governments and pilgrimage organizations have introduced biodegradable alternatives, but the scale of religious plastic input to the river remains a significant and under-addressed component of the overall contamination problem.
