Personal
Message from the Founder
It started with a river I thought I already knew — the Sudbury, and what measurement really requires.
It started with a river I thought I already knew.
My interest in water began with the Sudbury River in Massachusetts. I had passed it for years without thinking much about what lay beneath its surface. It looked like an ordinary New England river, bordered by wetlands and woods and used by people for canoeing and recreation. I later learned that this familiar landscape carried the legacy of industrial contamination from the Nyanza Chemical Waste Dump, including mercury pollution that led to decades of cleanup and ongoing concern about the watershed.
What stayed with me was not only the contamination itself. It was the distance between the activity that caused the damage and the people who inherited its consequences. The industrial operations were largely part of the past, but their environmental costs remained. They could persist in water, sediment, ecosystems, and public warnings long after the original economic activity had disappeared from view.
I later began monitoring the river through my school's Chemistry Club, which gave me more insight into the actual water quality and introduced me to another problem: when I shared my findings with organizations, I realized different groups measure different indicators, apply different standards, and describe their results in ways that are difficult to compare while studying the same river. With that information, understanding what they all meant across sources was much harder.
I found the same pattern as I began reading corporate sustainability reports. Oftentimes, companies described their commitment to water stewardship, but the evidence behind those claims varied greatly. Some provided detailed operational data, but others focused on individual projects and product designs. H2Oversight grew out of the connection between those two experiences, where harm can be hard to see and information can be difficult to interpret. I wanted to make corporate water performance easier for the public to examine so that consumers can make more informed choices, in turn motivating companies to have a stronger reason to improve. In that way, I hope to influence both stakeholders toward a more sustainable future.
The Sudbury River showed me that the costs of industrial activity do not necessarily disappear when the activity ends. H2Oversight is an effort to make those costs, and the decisions that shape them, more visible before they become another environmental legacy.
— Chaehyun HanFounder, H2Oversight
Chaehyun Han
Founder & Lead Researcher
Chaehyun Han founded H2Oversight to investigate a problem he repeatedly encountered in environmental research: organizations may discuss the same environmental issue while measuring and reporting it in fundamentally different ways.
His work focuses on corporate water sustainability, environmental measurement, public accountability, and the translation of complex ESG disclosures into information that can be compared across companies and industries.
Through H2Oversight, he independently reviews corporate sustainability reports, develops comparative water-reporting methodologies, and examines how stronger international disclosure standards could improve transparency and accountability.