Privacy Policy Shift Threatens Future of Census Data
The U.S. Commerce Department has banned the Census Bureau from using "noise infusion," a privacy protection technique that adds statistical noise to data. Experts warn this could lead to the release of less detailed data—or no data at all—for small areas and populations.
Policy Details
The new order requires the bureau to use "coarsening," a method that reduces data detail, instead of noise infusion. If coarsening is not feasible, the bureau is instructed not to publish the statistics at all. This policy also applies to the Bureau of Economic Analysis.
Reactions
- Beth Jarosz, Georgetown University: Warned that neighborhood-level and rural data may become unpublishable. She expressed concern over a lack of transparency and public input in the decision-making process.
- John Abowd, former Census chief scientist: Stated that for the 2030 census redistricting data, privacy protections will require a complete redesign. He predicts the result will be drastically reduced detail that most political mapmakers may find unusable.
- Census Bureau employee (anonymous): Described the policy as potentially "cataclysmic," calling it the end of much data production.
- Commerce Department spokesperson Kristen Eichamer: Defended the order, saying it prioritizes coarsening to maintain public confidence and safeguard privacy. She criticized noise infusion as undermining trust in the data.
Background
The debate over statistical noise in census data began with the 2020 census, when the bureau adopted a technique called differential privacy. A 2021 lawsuit by Alabama officials challenging the technique was dropped. A related lawsuit from America First Legal, filed in 2024, is currently ongoing.
The order could be reversed under a new administration, but census watchers worry about the impact on 2030 census preparations amid ongoing federal workforce reductions.