When Groundwater Exists but Is No Longer Safe: India’s Aquifer Quality Crisis

Groundwater contamination in India is becoming as important a challenge as falling water tables. For meaningful groundwater conservation and sustainable water management, India must protect not only how much water remains underground, but also its quality.

When a well dries up, the problem is easy to recognise. When the same well keeps producing clear water, few people ask what that water contains. That is what makes groundwater quality harder to see and, in many places, harder to manage.

For years, concern has centered on deeper borewells, declining water tables, and aquifers being pumped faster than they can recover. Those pressures remain serious. But an aquifer can still contain water even when it becomes unsuitable for drinking or other uses. Sustainable water management therefore must address quality alongside quantity. Some causes begin underground, where naturally occurring minerals dissolve into groundwater. Others begin at the surface, with fertilisers, sewage, poorly managed waste, and pollutants gradually moving down through soil and recharge pathways.

More recently, researchers have begun finding another category of pollutant in Indian groundwater: microplastics. These emerging contaminants add a new dimension to an already complicated groundwater-quality problem and to the wider challenge of water security in India.

Groundwater Quality in India: What National Monitoring Shows

The Central Ground Water Board’s Annual Ground Water Quality Report 2025 analysed 14,978 samples representing the 2024 national groundwater-quality scenario. About 71.7% complied with the permissible limits prescribed under Indian drinking-water standards, while 28.3% exceeded the permissible limit for at least one parameter. The report describes many of these as localised quality concerns rather than evidence that groundwater across India is unsafe.

Nitrate exceeded its permissible limit in 20.71% of monitored samples, making it the most widespread of the major parameters reported. Fluoride exceeded the limit in 8.05% of samples, while electrical conductivity, an indicator that can point to excessive dissolved salts or salinity, exceeded the specified level in 7.23% of samples. These findings reinforce the importance of long-term groundwater protection.

These percentages apply to the samples tested. They should not be used to claim that the same share of India’s aquifers, groundwater volume, or population is contaminated. They do show that groundwater quality in India cannot be treated as secondary to groundwater quantity.

For water security in India, the distinction matters. A source that exists but cannot safely serve its intended purpose is not a secure water source, which is why water conservation cannot be measured only by litres saved.

Causes of Groundwater Contamination in India Are Not All the Same

Scientific names can make the subject sound more complicated than it needs to be, but the key differences matter.

Nitrate is a form of nitrogen that dissolves in water. High concentrations in groundwater are commonly associated with fertiliser use, sewage and poorly managed organic waste. Activity on a farm, in a settlement, or around a waste site can eventually affect groundwater. CGWB largely attributes nitrate contamination to these human-driven sources. Preventing such pollutants from reaching recharge systems is therefore part of source water protection.

Fluoride works differently. In many affected areas, it occurs naturally in rocks. As groundwater remains in contact with fluoride-bearing minerals, some of that fluoride can dissolve into the water. The CGWB describes elevated fluoride as largely linked to geological conditions and water-rock interaction.

Arsenic is another naturally occurring element that can become a serious groundwater concern under particular geological conditions. In India, arsenic problems are especially associated with parts of the Ganga-Brahmaputra basin. The World Health Organization states that long-term exposure to elevated inorganic arsenic through drinking water can cause skin lesions and cancers, among other health effects.

This is why the phrase groundwater pollution in India actually describes several different problems. One community may face contaminants released naturally from geology; another may face pollution linked to farming, sanitation, or waste. Groundwater protection works only when you understand the source of the problem, just as effective plastic waste management depends on identifying where material leakage occurs.

Microplastics in Groundwater: An Emerging Contaminant

Plastic pollution is easy to notice when bottles pile up beside a road, float in a river, or accumulate in a landfill. Its connection with groundwater is much less visible.

Large plastic products do not remain intact forever. Sunlight, heat, abrasion, and weathering can break them into smaller fragments. Plastic particles below 5 millimetres are commonly described as microplastics. Once these particles disperse into the environment, recovering them becomes much harder.

The WHO assessment of microplastics in drinking water documents their occurrence across the water cycle, including source waters, tap water, and bottled drinking water. It also identifies environmental pathways through which plastic particles can reach freshwater systems. Understanding those pathways is increasingly relevant to sustainable groundwater management.

India already has a substantial plastic-waste stream to manage. Government data reported by State Pollution Control Boards and Pollution Control Committees to the Central Pollution Control Board show that 4,136,188 tonnes of plastic waste were generated in 2022–23.

That does not mean all of this material enters groundwater. It does show the scale of plastic that must be collected and managed to prevent environmental leakage. In that sense, plastic waste management is also part of source water protection and broader water stewardship.

Microplastics in Indian Groundwater: What Local Studies Show

Evidence from India is beginning to make the connection more concrete.

A 2025 peer-reviewed groundwater study from Kozhikode examined 120 urban open wells in Kerala and detected microplastics in 73.33% of the samples, at concentrations ranging from 24 to 1,889 particles per litre. Polypropylene was the most abundant polymer identified. The researchers examined several possible source groups linked to urban activity.

That 73.33% figure belongs to those 120 wells. It is not a national estimate of microplastics in groundwater in India. Its significance is narrower, but still important: it demonstrates that microplastic contamination can occur in groundwater used by communities. Preventing such contamination supports both groundwater protection and the principles of a circular economy that keeps materials out of the waste stream.

Another 2025 study around the Brahmapuram landfill in Kerala analysed 40 pre-monsoon groundwater samples and identified 261 microplastic particles in total. The highest concentration was at the landfill site, and the identified polymers included polyethylene, polypropylene, and PET.

The study brings waste management directly into the groundwater conversation. Water moving through waste can produce leachate that travels through soil and interacts with groundwater. A landfill, therefore, is not separate from the surrounding hydrological system.

These studies do not yet constitute a national baseline. They do, however, show why emerging contaminants deserve a place in future groundwater monitoring and why reducing single-use plastic matters beyond visible litter.

Bottled Water, Microplastics and the Single-Use Plastic Loop

Poor water quality creates another sustainability problem.

When people lose trust in groundwater or municipal supply, packaged drinking water offers an immediate alternative. Where reliable, safe water is unavailable, bottled water can fulfill a practical need. The difficulty begins when a temporary response becomes a permanent model for supplying drinking water. Long-term sustainable water solutions should address the source of poor water quality rather than simply shifting drinking water into disposable packaging.

Research from India has also detected microplastics in bottled water. A 2024 study of bottled water in West Godavari, Andhra Pradesh, examined nine brands and reported an average concentration of 2.89 microplastic items per litre, with polypropylene the dominant polymer, followed by PET.

A 2026 study of bottled-water brands sampled in Rupnagar used techniques that can detect much smaller particles. It found microplastics in every sample tested, at concentrations from 808 to 1,888 particles per litre; more than 91% of detected particles were below 40 micrometers.

Those studies should not be interpreted as evidence of a sudden hundred-fold increase. Their analytical methods and detectable particle sizes differ substantially. WHO has also highlighted the difficulty of comparing microplastic studies and the remaining uncertainty around potential health implications, particularly for the smallest particles.

The sustainability argument does not depend on exaggerating those uncertainties. It relates directly to groundwater conservation and the way material choices interact with the broader water cycle.

A single-use plastic bottle requires material and energy to manufacture, must be transported and collected, and becomes waste after a short period of use. If it escapes collection, the material persists and can fragment further.

This creates an uncomfortable loop: unsafe source water can increase dependence on packaged water; packaged water increases the flow of single-use material; and poorly managed plastic can become another pollutant moving through the wider water cycle.

That is precisely why water conservation and circular economy thinking belong in the same conversation. A sustainable system should solve the water-quality problem without creating an avoidable packaging problem, supported by sustainable water infrastructure that makes safe drinking water reliably accessible.

This also extends an argument explored earlier in WAE’s article The Great Water Trade: How the Plastic Bottle Industry Exploits India’s Groundwater, which examines the wider relationship between packaged-water dependence, groundwater extraction, and sustainable water management.

Source Water Protection Must Go Beyond Bottled Water

More bottled water cannot indefinitely substitute for functioning water infrastructure.

For nitrate contamination, groundwater conservation means looking above ground: fertiliser practices, sewage, sanitation, and waste disposal. Where arsenic or fluoride occur naturally, priorities shift to testing, appropriate treatment, and reliable access to safe alternative supplies. These are all part of broader water resource conservation.

Plastic requires a prevention-first approach. Recovering a bottle before it enters the environment is far easier than recovering microscopic particles after fragmentation.

India’s Extended Producer Responsibility framework for plastic packaging already requires producers, importers, and brand owners to meet recycling, recycled-content, and reuse obligations. For 2025–26, minimum recycling requirements range from 40% to 60% depending on the plastic packaging category.

This is an important circular-economy mechanism, but downstream recycling alone cannot eliminate leakage or unnecessary consumption. Reducing upstream single-use plastic, expanding refill systems, adopting reusable formats, and building reliable point-of-use drinking-water infrastructure can reduce the number of disposable containers entering circulation in the first place. Together, these measures strengthen source water protection and waste prevention.

The objective should not simply be to manage more waste efficiently. Where possible, it should also be to avoid creating that waste.

Groundwater Conservation Starts Above Ground

India’s monitoring systems are becoming more sophisticated, but emerging contaminants reveal a major gap. CGWB’s national assessment tracks established parameters, including nitrate, fluoride, arsenic, salinity, and several trace elements. No equivalent nationwide groundwater baseline for microplastics exists yet.

The local evidence from Kerala cannot fill that gap. It can, however, show regulators, researchers and water managers where the next questions lie.

Groundwater is influenced by what happens across the landscape above it: farms, drains, sewage networks, factories, landfills, roads, households, and the materials society throws away. Sustainable water management therefore has to connect aquifer protection with pollution prevention, waste management, and better, more sustainable water infrastructure.

A dry aquifer is a water crisis. An aquifer that still contains water but can no longer supply it safely is a water crisis too.

India will have to address both. Long-term water security depends on responsibly extracting groundwater, protecting recharge zones, preventing contaminants from entering water systems, improving plastic waste management, and reducing unnecessary single-use packaging where practical alternatives exist. These actions ultimately strengthen water security by protecting both water availability and water quality.

For organisations, these principles can also be translated into everyday hydration infrastructure. WAE’s approach focuses on plastic-free, point-of-use water systems designed to reduce dependence on packaged water supply chains while supporting broader water stewardship, circular-economy, and sustainability objectives.

Protecting groundwater means more than keeping water underground. It means ensuring that when the next generation reaches it, the water is still worth using.

For organisations looking to move from disposable packaged water towards infrastructure-led hydration, explore WAE’s approach to plastic-free hydration and water stewardship.

• 1 - Central Ground Water Board’s Annual Ground Water Quality Report 2025
• https://www.jalshakti-dowr.gov.in/static/uploads/2025/11/2d2afc1bcaa06de10de2f1ffe3276780.pdf
• 2 - World Health Organization, Arsenic Fact Sheet
• https://www.who.int/news-room/fact-sheets/detail/arsenic?
• 3 - World Health Organization, Microplastics in Drinking Water
• https://www.who.int/publications/i/item/9789241516198?
• 4 - https://www.pib.gov.in/PressReleasePage.aspx?PRID=2244106&lang=1&reg=3&utm
• 5 - Kozhikode groundwater microplastics study, 2025
• https://pubmed.ncbi.nlm.nih.gov/40907300/
• 6 - Brahmapuram landfill groundwater study, 2025
• https://link.springer.com/article/10.1007/s44288-025-00303-6?
• 7 - West Godavari bottled-water microplastics study, 2024
• https://www.sciencedirect.com/science/article/abs/pii/S0169772224000500?
• 8 - Rupnagar bottled-water microplastics study, 2026
• https://www.sciencedirect.com/science/article/pii/S2590123026009916?
• 9 - https://moef.gov.in/uploads/pdf-uploads/pdf_68401a627be674.03844470.pdf?