Uranium contamination in Delhi’s groundwater has emerged as a serious public health concern. The capital now ranks third in the country—after Punjab and Haryana—in the proportion of samples exceeding the permissible uranium limit.
Rising Share of Unsafe Samples
According to the Annual Ground Water Quality Report 2025 by the Central Ground Water Board (CGWB), 13–15% of analysed samples in Delhi contain uranium levels above the acceptable limit of 30 ppb (parts per billion). This significant rise raises concerns about drinking-water safety and long-term health impacts.
Steady Increase Since 2020
This trend reflects a worrying increase from 2020, when a detailed assessment found 11.7% of samples exceeding the threshold. That study also recorded one of Delhi’s highest uranium concentrations—89.4 ppb from a tubewell in North West district.
By 2024, six districts—North, North West, South, South East, South West and West—reported levels above the safe limit, contributing to a citywide contamination rate of 10.7%.
Environmental Groups Raise Red Flags
As reported by TOI, the new report has prompted environmental groups to call for more granular data and transparency in treatment protocols. Earth Warrior, an environment collective, warned that the co-occurrence of uranium, nitrate, fluoride, and high salinity poses severe health hazards.
The group highlighted that the Delhi Jal Board (DJB) depends on 5,500 tubewells, which supply nearly 450 million litres per day (mld) of semi-treated or untreated groundwater—magnifying the risk for consumers.
National Groundwater Trends Show Widespread Contamination
CGWB collected 3,754 groundwater samples across India during pre- and post-monsoon periods of 2024. It found uranium levels above the safe limit in 6.71% and 7.91% of samples, respectively, indicating a slight post-rainfall spike.
Punjab showed the highest contamination—53% pre-monsoon and 62.5% post-monsoon—followed by Haryana (15% and 23.75%) and Delhi (13% and 15.66%).
Identified Hotspots in Delhi
In the capital, areas such as Auchandi in Narela (42 ppb) and Nizampur in Kanjhawala (46.5 ppb) have emerged as contamination hotspots requiring urgent intervention.
Severe Health and Agricultural Implications
The report warns that prolonged exposure to uranium, arsenic, and lead in drinking water can result in neurological damage, kidney disorders, skeletal deformities, and an elevated cancer risk.
Additionally, high levels of iron and manganese threaten the health of infants and children. Beyond human health, widespread contamination compromises groundwater potability and harms agriculture by enabling toxin buildup in soil and crops.
Other Water Quality Concerns for Delhi
Apart from uranium, Delhi recorded one of the country’s highest sodium adsorption ratio values—179.8. This places the city among the 1.11% of locations nationwide where groundwater is unsuitable for irrigation. Furthermore, 7.23% of areas reported high salinity or electrical conductivity, further reducing water usability.
Regular Alerts Issued to State Agencies
CGWB issues fortnightly groundwater quality alerts to state government agencies. These updates aim to support timely action, enhance monitoring, and promote public awareness on water safety.