Telangana’s groundwater crisis is no longer only a question of how much water remains underground. The Central Ground Water Board’s Annual Ground Water Quality Report 2026, as reported by the Times of India, points to a parallel problem: water available through borewells may contain nitrate, fluoride, uranium, iron and manganese at concentrations above permissible limits in several parts of the state. For households that rely on groundwater for drinking and domestic use, this turns water stress into a question of safety as well as supply.
The concern is particularly relevant to the urbanising areas around Hyderabad. Rangareddy has emerged as a major nitrate hotspot, with samples from several locations recording concentrations four to five times the permissible limit of 45 mg per litre. The report also identifies high concentrations of fluoride and uranium in parts of Nalgonda, Nirmal, Mahabubnagar, Wanaparthy and Vikarabad. This distribution indicates that contamination is not confined to one isolated site or one type of settlement.
The distinction between quantity and quality is important for the way cities plan their water systems. A borewell can continue to produce water even when that water is unsuitable for drinking. In areas where piped supply is intermittent, expensive or unavailable, families may treat groundwater as a dependable fallback. But the presence of contaminants that cannot be identified by sight, smell or taste means that access to a functioning borewell does not automatically amount to access to safe water.
The latest findings build on concerns documented in the previous CGWB report. In 2025, 290 of the 1,114 groundwater samples analysed in Telangana exceeded the permissible nitrate limit. Another 167 samples recorded fluoride concentrations above the prescribed limit of 1.5 mg per litre. These figures do not establish that every borewell in the state is contaminated, but they show that the problem is sufficiently widespread to require systematic monitoring rather than isolated responses.
Nitrate contamination is closely connected to how settlements manage human waste, sewage and discarded material. Experts cited in the report have pointed to inadequate sewage infrastructure and poor waste management as potential contributors. In several urban areas, including Hyderabad, sewage flows through open nalas intended to carry stormwater. During rains, sewage overflows can contaminate surrounding areas and potentially seep into the ground.
This is an infrastructure problem as much as a water-quality problem. Stormwater drains, sewage networks, septic systems, solid-waste collection and groundwater monitoring are often managed through separate administrative arrangements. Yet contaminants do not follow departmental boundaries. When sewage enters a stormwater channel, when waste is dumped near a recharge area, or when a settlement expands without adequate sanitation, the consequences can appear later in groundwater samples rather than at the point where the failure occurred.
The rural sources described in the report show a similar connection between sanitation and aquifer quality. Human waste, indiscriminate garbage dumping and the disposal of festive waste can contribute to nitrate pollution. In this sense, the groundwater findings are also an indicator of gaps in everyday urban and rural services. The aquifer records the cumulative effect of decisions about toilets, waste collection, drainage, land use and the location of activities that generate pollutants.
Fluoride presents a different pathway. M V S Giridhar, a professor at the Centre for Water Resources at JNTU Hyderabad, explained that fluoride has long been a concern in Telangana because of the region’s geological formations. As rainwater percolates through the ground, it can dissolve fluoride-bearing minerals in rocks and carry the element into groundwater. This means that not all contamination can be addressed through sewage control alone. Geological conditions, groundwater extraction and the natural chemistry of aquifers also have to be understood.
The presence of uranium adds another layer to the challenge. According to health experts cited by the report, prolonged consumption of uranium-contaminated water can damage the kidneys. Excessive nitrate, fluoride and uranium concentrations also carry different risks and affect different groups unevenly. Nitrate is especially dangerous for infants because it can cause blue baby syndrome, a condition that reduces the blood’s ability to carry oxygen. Long-term exposure to high fluoride levels can cause dental fluorosis in children and skeletal fluorosis in adults.
General physician Chaitanya Challa said children, infants and pregnant women are especially vulnerable to the risks associated with nitrates, fluoride and uranium. The health effects described in the report include potential risks linked to prolonged exposure, including kidney damage, bone and dental problems, and other impacts identified by health experts. This makes groundwater quality a public-health issue that extends beyond environmental monitoring. It requires residents, health systems and local administrations to know where contamination exists and what alternative water sources are available.
A common response to unreliable or poor-quality groundwater is to drill deeper. But the report cautions against assuming that depth guarantees safety. In parts of Telangana, borewells may reach depths of 1,500 to 3,000 feet. B V Venkateshwar Rao, an expert in disaster management, said deeper groundwater extraction can increase the concentration of total dissolved solids, including dissolved minerals and salts. He noted that the desirable TDS level for drinking water is around 500 mg per litre, while levels approaching or exceeding 1,000 mg per litre can affect water quality and potability.
This challenges a widely held assumption in water-stressed settlements: that a deeper aquifer is necessarily a cleaner aquifer. Deeper groundwater may contain higher concentrations of metals and minerals, according to the expert cited. Drilling further down can therefore increase access to water while leaving the household exposed to a different quality risk. Without testing, consumers may have no reliable way to determine whether a deeper source is suitable for drinking.
For Hyderabad and its surrounding districts, the issue is tied to the uneven expansion of the metropolitan region. Urban growth increases demand for water while also increasing sewage generation, waste volumes and pressure on land used for recharge. Where formal networks do not keep pace with growth, households and institutions may turn to private borewells, septic systems, water tankers or informal disposal arrangements. Each solution can reduce immediate service pressure while making the wider groundwater system harder to monitor and protect.
The CGWB findings also raise questions about how groundwater information is translated into local action. A state-level report can identify chemical concentrations across samples, but residents need location-specific information: which sources are unsafe, which contaminants are present, how frequently testing is conducted, and what alternatives are available. Local bodies and water agencies also need to connect sampling results with drainage upgrades, sewage-control measures, waste-management enforcement and public-health communication.
The institutional challenge is that groundwater quality cannot be secured through extraction controls alone. The evidence reported here links contamination to both natural geological conditions and human activity. That requires coordination between groundwater authorities, municipal bodies, sanitation agencies, public-health departments and local administrations. It also requires distinguishing between contaminants that can be reduced through better waste and sewage management and those that require treatment or alternative water supplies because of their geological origin.
The numbers from the 2025 report provide a measurable warning: 290 of 1,114 samples exceeded the nitrate limit, while 167 exceeded the fluoride limit. The 2026 findings add the reported nitrate concentration in parts of Rangareddy and identify fluoride and uranium concerns across multiple districts. Together, they show that the state’s groundwater challenge has at least two dimensions: the scale of contamination in specific locations and the ability of institutions to detect, communicate and respond to it.
What remains unclear from the supplied evidence is the exact number of households currently exposed, the precise locations of all affected samples, the treatment status of individual borewells and the extent to which contamination levels have changed over time. Those gaps matter because a state-wide finding cannot by itself determine the safety of every local source. But the available evidence is sufficient to establish that groundwater quality must be treated as a core element of water security.
Telangana’s experience shows why urban water planning cannot stop at supply augmentation. New sources, deeper borewells and higher extraction may address immediate scarcity without resolving contamination caused by sewage, waste or natural geology. The next administrative task is to connect groundwater testing with public disclosure, sanitation infrastructure, waste management and safe drinking-water provision. Until that link is made, households may continue to receive water that is available in quantity but unsafe in quality.
