Opinion
Are agrochemicals the cause of the Rajarata Kidney Disease?
By Dr Parakrama Waidyanatha
Various reports in the media yet claim that the Rajarata kidney disease, scientifically defined as the chronic kidney disease of unknown etiology (CKDu), is caused by agrochemicals whereas the overwhelming evidence is that it is caused by hard water and fluoride prevalent in dug wells on high ground. Further it claimed that the number of patients is on the increase whereas published evidence is that it has been decreasing from 2016.
Agrochemicals are not the cause
An exhaustive study carried out by the World Health Organization under the aegis of the National Science Foundation of Sri Lanka (NSF)was published in 2013. Although it failed to bring out conclusive evidence as to the etiology, it suggested an involvement of pesticides in the causation of the disease in that residues of some pesticides were above reference levels in the urine of CKDu patients. However, the pesticides residues of subjects in a non CKDu, control area (Hambantota) were also measured but the report failed to quote that data. The writer was able to get the raw data of the urine pesticide residues of Hambantota from the NSF, and to his dismay it was found that the residue levels were far higher in the urine of non-CKDu subjects of Hambantota as seen in Table 1 .As per the grapevine, the draft Report did not come up with any firm conclusions but at the insistence of the then political authority they were compelled to make some conclusions. So, it was vaguely concluded that agrochemicals probably played a role in the etiology of the disease. It is probably why the data of the non-CKDu patients were not reported!
A report entitled “Health effects of fertilis ers and pesticides” was submitted to the authorities on 22-October-2021 by none other than Dr S. H. Munasinghe, Secretary, Ministry of Health. Therein he has clearly stated that there is no evidence for a direct link between the kidney disease and agrochemicals. The report may be read at: https://dh-web.org/place.names/posts/Ministry of HealthReviewAgroChem2021.pdf. (See Table 1)
There have been various other unsubstantiated claims for a link between agrochemicals and the kidney disease. For example, a research paper in an open-access (fee levying) journal, titled ‘International Journal of Public Health, Prof. Channa Jayasumana and two other authors hypothesised that glyphosate forms complexes with heavy metals such as cadmium and arsenic in hard water causing the kidney disease. No evidence has been established to prove the formation of such complexes. However, the claim that glyphosate is a probable etiolating agent led to the then government to ban glyphosate which caused serious hardships in weed management in crops. The ban was finally lifted initially for tea and later for all crops!
The claim that agrochemicals are the cause of many health problems have let to the coining of the term wasa visa to agrochemicals. It has also been purported that Sri Lanka is the country that uses the highest quantities of fertilisers and pesticides in the world! However, the available evidence as shown in Table 2 clearly establishes that Sri Lanka is one of the countries using the least amounts of both fertilisers and pesticides. (See Table 2)
Hard water and fluoride are the key causes for the disease
Not agrochemicals but fluoride and hard water are the causes for the kidney disease have been now well established. Apartment from several quality publications, a dramatic study compared two adjacent villages in Girandurukotte, namely, Badulupura, on high ground where the people exclusively drank water from dug wells and Sarabhumi in the plain where the people drank water from the river, reservoir or wells dug close to their homes. The Badulupura people contracted the disease, while affecting virtually none from Sarabhumi. Analysis of the water in the wells in the Badulupura and Sarabhumi revealed that the Badulupura water was hard and heavily contaminated with fluoride, a highly nephrotoxic chemical. However, there was no evidence of any agrochemicals above safety limits in the Badulupura waters. Further evidence for a role for fluoride in the disease is that CKD patients also often have dental fluorosis.
That people living in the planes and consuming water from reservoirs and rivers do not contaminate the disease is further exemplified by the fact that people in the Anuradhapura city and consuming tap water from the reservoirs do not contaminate the disease.
Commencing in the mid 2010-decade, community-based reverse osmosis (RO) water treatment plants were established as an interim measure for producing safe drinking water for the endemic areas of the kidney disease in the rural dry zone of Sri Lanka. It was reported that RO –treated water diminished progression of the disease. In addition, during the same period rain water harvesting and consumption were introduced to the Badulupura people, and it has now been reported there has been a diminution of the occurrence of the disease in the village. However, a formal study yet needs to be done to confirm this observation.
Moreover, a study published in the journal, Science of the Total Environment( Vol. 745, 2020) by a Japanese team of scientists in collaboration with some Sri Lankan scientists established that alkalinity, hardness and microbial parameters in the ground waters exceeded the maximum allowable limits(MAL) for drinking water in all disease affected study areas. Also, Magnesium exceeded the minimum allowable limit exclusively in the disease prevalent areas.
A further study involving feeding Wistar rats undertaken at the University of Peradeniya and reported in an issue of Ceylon Medical Journal in 2017 established that high fluoride, hard water and other undetected toxins in shallow dug wells may be the causative factor for renal and liver lesions that were detected in these rats. (Figure 01)
In vegetable growing areas of the upcountry and Puttalam where agrochemical use has been far more than in the Rajarata, no CKD has been reported. Moreover, in Mulaitive, a hard water area where no agrochemicals had been hardly used due to unavailability during the Tamil rebellion which lasted over two decades, no CKD has been reported.
Evidence is thus, overwhelming that the chronic kidney disease of unknown etiology (CKD) is related to drinking hard water containing fluoride and magnesium. Some 176,000 such wells are reported to be present in the Rajarata.
The disease in the early stages of research towards detection of its etiology was referred to it as ‘the chronic kidney disease of unknown etiology’ (CKDu). But now with a firm understanding of the cause of the disease the ‘u’ has been dropped and the disease should be referred to as the chronic kidney disease (CKD).
However, there are also recent claims that the numbers of CKD patients are on the increase. On the other hand the Figure 1. Clearly shows that the numbers of new patients are on the decline after the introduction of RO filters and rainwater harvesting. Regrettably, it appears that the health authorities have not published the data after 2017.
Although adequate supplies of safe drinking water may not be available in all CKD endemic areas, the people are now amply aware that the disease is caused by the consumption of hard water from wells on high ground containing fluoride and magnesium, and they avoid drinking such water.
Opinion
A safe harbour without a legal map: Why Sri Lanka needs a domestic refugee law
by Viran Maddumage
Assistant Lecturer & PhD (Reading) Department of Human Geography and Migration,
Macquarie University Australia
&
Sanduni Rathnayake
Lecturer (Probationary) Faculty of Law,
General Sir John Kotelawala Defence University
When a boat carrying desperate people reaches the shores of an island, the first question should be a humanitarian one: how can these people be kept safe? But sooner or later, another question becomes unavoidable: what does the law say?
For Sri Lanka, that question is becoming increasingly important.
In December 2024, the Sri Lankan Navy rescued more than 100 people believed to be Rohingya refugees from a fishing vessel found adrift off the country’s northern coast. Among them were women and children. They were brought ashore and provided with food, water and medical assistance. The incident was not entirely unprecedented; Sri Lanka had encountered a similar arrival of Rohingya people by sea in 2022.
These incidents expose an uncomfortable gap in Sri Lanka’s legal architecture. Sri Lanka is capable of rescuing people in distress. It can provide immediate humanitarian assistance. But once those people reach our shores and seek protection, where exactly does the law take them?
Sri Lanka has not ratified the 1951 Convention relating to the Status of Refugees or its 1967 Protocol. The Convention and Protocol constitute the central international instruments defining refugee status and establishing international standards for refugee protection. More importantly, Sri Lanka does not currently have a comprehensive domestic legal framework establishing a national procedure for determining refugee status. UNHCR has consequently played an important role in registering and assessing asylum claims in Sri Lanka.
This arrangement may function when refugee movements are limited. But it is not a substitute for law.
Problem of a legal vacuum
An asylum-seeker is not simply an undocumented migrant. An asylum-seeker is a person asking another state for protection because returning home may expose them to persecution or serious harm. A refugee is a person whose circumstances meet the applicable criteria for international protection.
The distinction matters because ordinary immigration law is principally concerned with controlling entry, residence and departure. Sri Lanka’s Immigration and Emigration framework, for example, is designed to regulate the entry and departure of persons and to provide for the removal of certain non-citizens. Refugee law asks a different question: what happens when the ordinary assumption that a person can simply be returned to their country of nationality is no longer safe?
That question cannot be answered adequately through immigration enforcement alone.
At present, Sri Lanka lacks a dedicated statutory process that clearly answers basic questions. Who may apply for asylum? Who determines whether an individual qualifies for protection? What procedural rights does the applicant have? What evidence must be considered? Is there a right to appeal? What happens while an application is pending? When may detention be used? What happens when the applicant is a child? And, most importantly, what safeguards exist against returning a person to a place where they face persecution or other serious harm?
Leaving such questions to ad hoc administrative arrangements creates uncertainty not only for refugees and asylum-seekers, but also for the State itself.
Why international law alone not enough
One might respond that Sri Lanka already participates in the international human-rights system and therefore has obligations relevant to the treatment of vulnerable non-citizens. That is true. But international commitments and domestic enforceability are not necessarily the same thing.
Sri Lanka’s constitutional and legal framework has traditionally reflected a dualist approach to international treaties. The Supreme Court’s decision in Singarasa v Attorney-General is particularly significant in this regard. The judgment recognised that treaty obligations undertaken by the State do not, merely by virtue of international acceptance, automatically become enforceable domestic law; legislative implementation is required for treaties to have internal legal effect.
This principle makes the case for domestic refugee legislation even stronger.
The answer is not to pretend that international law does not matter. Nor is it to suggest that Sri Lanka has no responsibilities towards people seeking protection. Rather, the lesson is that where protection is important enough to be recognised internationally, it should also be translated into clear domestic rules that courts, public officials and affected individuals can actually understand and apply.
A refugee should not have to depend upon uncertainty about the precise relationship between an international obligation, administrative practice and domestic immigration law to know whether they can safely remain in the country while their claim is considered.
Principle of non-refoulement
At the heart of refugee protection is the principle of non-refoulement: the prohibition against sending a person back to a place where they face persecution or other serious threats to their life or freedom.
The principle is one of the foundational concepts of international refugee protection. Its significance extends beyond the formal status of a person as a recognised refugee. International human-rights law also provides important protection against removal in circumstances where return would expose an individual to serious harm.
For Sri Lanka, the question therefore cannot simply be whether the country has ratified the Refugee Convention. The more fundamental question is whether Sri Lankan law provides an effective mechanism for ensuring that a person who may require international protection is identified and assessed before removal.
Without such a mechanism, even a principle as important as non-refoulement risks becoming difficult to operationalise.
The Rohingya arrivals demonstrate why this matters. These were not abstract legal hypotheticals. They were human beings arriving by sea after fleeing circumstances in which their safety could not simply be assumed. The State had to decide what to do with them.
And whenever the State must make such decisions, law matters.
A Sri Lankan solution
The answer should not necessarily be the wholesale transplantation of another country’s refugee legislation. Sri Lanka has legitimate interests in border management, national security, immigration control and public order. A domestic refugee law can recognise those interests while also establishing safeguards for people genuinely in need of protection.
A Sri Lankan Refugee and Asylum Act could establish a clear national asylum procedure. It could define who qualifies as a refugee and who may seek asylum, establish an independent or appropriately insulated refugee-status determination mechanism, and provide applicants with basic procedural guarantees.
There should be an opportunity to present evidence, an obligation to give reasons for decisions and a meaningful avenue of review or appeal.
The legislation should also address detention. Irregular entry should not automatically transform a person seeking protection into a criminal. Where detention is considered necessary, the law should establish clear grounds, safeguards and review mechanisms, with particular protection for children and other vulnerable persons.
The framework should provide temporary documentation to asylum-seekers while their claims are being considered. It should address access to essential healthcare and education, and determine whether and under what conditions recognised refugees may work.
Most importantly, the legislation should expressly incorporate appropriate safeguards against refoulement.
Such legislation would not mean that every person arriving without a visa must be permitted to remain indefinitely. Refugee law has never required that. A functioning asylum system distinguishes between those who require international protection and those who do not. It gives the State a lawful process through which to make that distinction.
That is precisely why having a legal framework can actually strengthen immigration control rather than undermine it.
From humanitarian reaction to legal certainty
Sri Lanka has a long history of displacement. Hundreds of thousands of Sri Lankans themselves experienced displacement during the country’s civil conflict, while many Sri Lankans sought protection abroad. The experience of displacement should make the country particularly conscious of what it means to cross a border because remaining at home is no longer safe.
At the same time, Sri Lanka is not required to choose between compassion and sovereignty.
A properly designed refugee law can protect both.
It can establish who has a right to seek protection, who decides that claim, what evidence is required and what happens when the claim succeeds or fails. It can provide national authorities with procedures rather than uncertainty. It can provide courts with legal standards rather than administrative ambiguity. And it can provide refugees and asylum-seekers with something that is often more valuable than a promise of goodwill: legal certainty.
There is also a broader institutional argument. Reliance upon external humanitarian actors to fill a domestic legal gap may be understandable as an interim measure, but refugee protection should ultimately rest upon a framework for which the State itself is legally accountable.
Sri Lanka therefore faces a choice.
It can continue responding to refugee arrivals when they occur; rescuing boats, providing temporary assistance and finding administrative solutions to individual situations.
Or it can anticipate the next arrival before it happens.
The second approach is the more responsible one.
The sea surrounding Sri Lanka has never been merely a geographical boundary. It has been a route of migration, trade, conflict, escape and refuge. People will continue to cross it for many different reasons. Some will arrive as migrants. Some will arrive irregularly. Some may arrive because they have nowhere safe to return to.
When the next boat reaches our shores, Sri Lanka should not have to improvise its legal response.
A safe harbour needs more than compassion. It needs a legal map.
For Sri Lanka, the time has come to draw one.
Opinion
Panadura debate: special exhibition most welcome
The special exhibition displaying original manuscripts relating to the Panadura Debate at Rankoth Vihara is welcome and, as Nishantha Peiris mentions (News, 30 Aug), the debate gained international interest following the publication of a book containing the speeches made in the debate. The credit for this must be given to John Capper, the then editor of the Ceylon Times. He published an account of each day’s proceedings in his paper and the full text of the speeches in a book entitled ‘Full Account of the Buddhist Controversy Held at Pantura in August 1873.
The preface of the book stated: ‘In the belief that an authentic account of the Controversy which took place at Pantura in August last, between a Buddhist Priest and two Ministers of the Protestant religion, will be read with interest by a large number of persons here and in Europe. I have produced the proceedings in the present form. The report has been revised by the respective disputants, so that it may be taken as a correct account of what passed’.
Capper’s book was picked up by J M Peebles who was in India, who then published an extended version in the United States. If an original copy of Capper’s book is available in Sri Lanka, it should be exhibited in the Rankoth exhibition.
Yours faithfully,
Dr R P Fernando,
19 Danetree Close,
Epsom UK
Opinion
In Memory of Dr Upatissa Pethiyagoda
It is with a deep sense of sadness that I record the passing of Dr Upatissa Pethiyagoda, who died on 27 August 2026 at the age of 94. To many, he was a distinguished scientist, accomplished administrator, diplomat and public intellectual. To me, he was much more than that.
Dr Pethiyagoda was a proud product of Trinity College, Kandy. At a time when a first class in Botany was a rarity, he obtained one and subsequently pursued postgraduate studies in London. His scientific career reflected not only his knowledge but, more importantly, an enquiring and restless mind that was never satisfied with simply accepting what was known.
In the 1970s, he headed the Plant Physiology Department of the Tea Research Institute of Sri Lanka. He was part of a formidable team of scientists that included Drs R L de Silva, R L Wickramasinghe, P Sivapalan, Tilak Wettasinghe and W Danthanarayana. They were scientists who contributed enormously to the development of the tea industry in Sri Lanka, and Dr Pethiyagoda stood comfortably among them.
In 1978, he moved to the Coconut Research Institute as its Director. It was there that I had the privilege of working with him. Those years left a lasting impression on me.
Dr Pethiyagoda was, in every sense, a complete scientist. Although his formal specialisation was plant physiology, he was remarkably comfortable discussing almost anything scientific. What distinguished him was his curiosity. He questioned the science behind the ordinary things that most of us simply accepted. I remember his asking questions such as, why is an orange green in Sri Lanka? It was typical of him: an apparently simple observation would lead him to ask what lay behind it.
That curiosity never left him.
After his tenure at the CRI, he undertook an FAO assignment in the Middle East, working on the improvement of date palms. There he was exposed to agriculture under conditions of severe water scarcity. He pursued this further during a visit to Israel, learning about agronomic practices suited to such environments. Later, when he worked with the Mahaweli Authority, he was able to translate that knowledge into practice, introducing high-value horticultural crops to Systems B and C.
What impressed me was not merely that he acquired knowledge, but that he connected knowledge from one context to another and turned it into practical solutions. His enquiring mind and analytical ability enabled him to do this with remarkable effectiveness.
He was equally impressive as a communicator. Dr Pethiyagoda was an eloquent speaker, whether he was talking about science, agriculture, public policy or the everyday affairs of our country. His speeches were often laced with wit, humour and the occasional tongue-in-cheek remark. But beneath the humour was a very serious mind. He was forthright in his opinions and, importantly, he was not afraid to express them, whatever the possible repercussions.
His contributions to the media demonstrated this courage.
Writing about the travel to London by a former President, he observed:
“Where a person enjoys immunity by virtue of his position, this carries a reciprocal obligation to exercise an abundance of exemplary behaviour. In effect, immunity is best exercised, when the need to invoke it, is never allowed to arise.”
[Immunity Does Not Confer Impunity – Colombo Telegraph]
That was quintessential Pethiyagoda—precise, pointed and impossible to misunderstand.
He was equally outspoken about the government’s decision to ban inorganic fertiliser with ‘immediate effect’. He was deeply distressed by what he believed would be the consequences for farmers, particularly the poorer farming community. He would speak about it almost every day, driven not by political considerations but by his conviction that science and evidence had been disregarded.
In one of his writings on the subject, he remarked:
“What the ‘Vipathmaga’ caper taught us was that advice of sundry ‘Experts’ can be disastrous. Professors of Surgery, clergymen and Pediatricians are not the best equipped to advise on fertilisers, as much as a Soil Scientist should not prescribe treatment for a sick child.’ [Some Lessons That Can Be Learned Even From Disasters – Colombo Telegraph]
And in another article, his frustration was summed up in the memorable words:
“Stupidity, like History, has a way of repeating itself.”
[Unscrambling eggs – Colombo Telegraph]
These were not simply provocative statements. They reflected a scientist who believed deeply that public decisions, particularly those affecting agriculture and the livelihoods of farmers, should be based on evidence and sound scientific advice.
Perhaps, what I will remember most about Dr Pethiyagoda is that his curiosity survived almost to the very end of his life.
Very recently, he was still asking questions and pursuing ideas. He was interested in the possible genetic differences between the waraka and wela varieties of jak, because he wondered whether the wela variety might have commercial potential for cellulose extraction. He was disappointed that he could not find relevant scientific literature in Sri Lanka. More than the particular subject, what struck me was that at 94 he was still thinking about a scientific question, looking for evidence and wondering whether an apparently ordinary resource could have an important national application. He lamented the lack of interest among scientists and academics in such questions of national importance. That concern, too, was very much part of who he was.
Dr Pethiyagoda also served as President of the National Academy of Sciences, Sri Lanka. Unfortunately, he was unable to complete his term because he was appointed Ambassador to Italy, with representation at the Food and Agriculture Organization in Rome. Even in that role, he remained very much the scientist. I understand that he made a significant contribution to FAO discussions. As Ambassador, he also had the unenviable task of entertaining Sri Lankan Ministers of Agriculture who attended FAO sessions. I know from my own conversations with him that those informal dinners were not merely social occasions. He would discuss agricultural issues with the Ministers, and I have little doubt that his views—and the force with which he expressed them—sometimes influenced their thinking.
Looking back, what I admired most about Dr Pethiyagoda was not any particular position he held or any particular achievement. It was the way he thought.
He questioned.
He analysed.
He connected ideas.
He challenged conventional wisdom.
And he was willing to say what he believed to be true.
He also demonstrated that science should not remain confined to laboratories, research papers or academic institutions. For him, science was a way of looking at the world and, ultimately, a means of improving the lives of people.
It is perhaps ironic that, only a few months ago, he wrote about “The Cost of Dying”, as distinct from the “Cost of Living”. In that article, he reflected on the manner in which our mortal remains should be disposed of, observing: “I am in two minds regarding the manner in which the mortal remains are disposed of, ‘according to the will of the deceased’. But with the cessation of the breath, ownership or tenancy ceases.” Even in contemplating death, he brought his characteristic questioning mind to the subject. What particularly caught my attention, however, was his explanation of the Buddhist practice of holding dânes (almsgivings) for monks of the local temple in the seventh day and third month following a death. I had never really thought about the significance of this practice before. That, too, was typical of Dr Pethiyagoda: he could take something that we had accepted as ordinary and familiar and make us stop, think and see it differently.
His passing has created a colossal vacuum in Sri Lanka’s scientific community. People of his intellectual breadth, curiosity, courage and independence are rare. We may not always have agreed with everything he said, but we could never doubt that he had thought deeply about it and that he had the courage of his convictions.
For those of us who had the privilege of knowing him, there is sadness in his passing. But there is also gratitude—for having known such an extraordinary mind, for having learnt from him, and for having witnessed at close quarters his unwavering commitment to science and to the development of our country.
I shall remember Dr Pethiyagoda with great affection and immense respect.
Ranjith Mahindapala
Past President, National Academy of Sciences of Sri Lanka.
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