# Effects of an information shock on registry-based health indicators: Evidence from a Swedish PFAS crisis

## TL;DR

This study examines how a public announcement about high levels of toxic chemicals in drinking water affected health care use in a Swedish community.

## Contribution

The study provides evidence on the health impacts of an information shock, independent of actual chemical exposure.

## Key findings

- No significant increase in healthcare utilization was observed after the PFAS announcement.
- Mental health-related care and medication prescriptions did not rise significantly.
- The community and authorities effectively managed the crisis to mitigate anxiety-related health impacts.

## Abstract

This study investigates how the public announcement of very high levels of the toxic chemicals PFAS in the drinking water in Kallinge, Sweden, impacted the health of local residents. By leveraging the unexpected timing of the announcement and utilizing high-frequency individual-level healthcare data, we can isolate the effects of the information shock independently of any toxic effects of PFAS exposure. Despite numerous reports of distress and concern among those affected, our analysis reveals no significant increase in health care utilization following the announcement, as measured by prescription drug use and specialist healthcare visits. This finding holds true even when specifically examining mental health-related care, prescriptions of antidepressants, and sleeping medications. Overall, our results suggest that both the affected community and public authorities managed the situation effectively, mitigating potential health consequences related to anxiety.