Kerala's Water-Borne Disease Crisis: A Public Health Paradox
Kerala, a state long celebrated as a model of public health in India and consistently ranking among the best in health indicators, is grappling with recurrent outbreaks of water-borne diseases such as shigellosis, Hepatitis A, and amoebic meningoencephalitis. This crisis stands in stark contrast to its successful management of complex diseases like Nipah, highlighting a systemic failure to address environmental health determinants.
Rapid urbanisation and social development, coupled with inadequate attention to water quality, sewage infrastructure, and environmental health, threaten to undermine Kerala's reputation. According to state health data, between four to five lakh cases of Acute Diarrhoeal Diseases (ADD) are reported annually. Hepatitis A cases surged to 31,536 with 82 deaths in 2025; as of June 15 this year, nearly 9,000 cases and 25 deaths have been recorded. Amoebic meningoencephalitis, linked to faecal contamination in domestic wells, has claimed the highest number of lives, with 134 cases and 34 deaths as of June 15.
The root causes lie in groundwater contamination and poor sanitation infrastructure. Over 62% of the population depends on groundwater from approximately 7 million wells. However, as of 2025, less than 6% of Kerala has proper sewerage network coverage, with most major cities lacking household sewage collection systems. The Comptroller and Auditor General's 2025 report noted that under the AMRUT Mission, Kerala achieved only 11.25% overall and just 0.13% of households received sewerage connections.
While the state has high sanitation coverage with many households using septic tanks, these are often poorly designed and located near domestic wells, leading to groundwater contamination. Kerala's high population density and small landholdings exacerbate the problem. Studies by the Centre for Water Resources Development and Management report faecal contamination in over 70% of open wells. A 2018 study in Thiruvananthapuram found coliform contamination in 73% of wells, with inadequate chlorination and cleaning practices.
Epidemiological investigations reveal that outbreaks in rural areas are linked to local drinking water sources. Water from regional supply systems is often pumped into lines without adequate chlorination or filtration, and pipelines running close to sewage drains risk contamination when breaks occur.
Addressing this crisis requires coordinated action beyond the health sector, focusing on safe drinking water, proper sewage systems, and environmental health governance.
