On June 4, the Trump administration issued an order banning “noise infusion” for statistical products released by the Census Bureau and the Bureau of Economic Analysis.
The directive, titled Disclosure Avoidance for Statistical Products, mandates that coarsening must be the preferred method for protecting privacy. Suppression remains permitted only as a last resort when coarsening is legally prohibited or would destroy data accuracy.
Noise infusion adds random values to a dataset to obscure sensitive details. Coarsening involves grouping or rounding data into broader ranges. Suppression removes specific information entirely, often replacing it with asterisks.
Hansi Lo Wang of NPR first reported on the shift. Experts warn that limiting these techniques will reduce the reliability of public data used for redistricting, disaster response, workforce analysis, and housing reports.
Beth Jarosz, a senior fellow at Georgetown University’s Massive Data Institute, explained the practical impact via email. “Because ‘coarsening’ and suppression are the only not-prohibited tools named in the order, it means that to keep information safe, the Census Bureau and BEA need to group small things (like small communities or small business types) into larger ones, or they need to suppress the data completely,” she said. “Small industries may get rolled into bigger industry categories. Small counties may get rolled into county groups or not reported at all.”
On June 17, five organisations released a joint statement condemning the rule. The groups include the Population Association of America, the Council of Professional Associations on Federal Statistics, the Association of Public Data Users, the Inter-university Consortium for Political and Social Research, and the Association of Population Centers.
“This order subverts processes developed over decades to foster transparency and public trust and creates a scenario in which there will either be less privacy for our personal information, or less usable data, or both,” the statement reads.
Steve Pierson, Director of Science Policy for the American Statistics Association, wrote that the order “handcuffs the Census Bureau and the Bureau of Economic Analysis in terms of the techniques they can use for protecting the privacy of respondents.”
John Abowd, former Chief Scientist at the Census Bureau, posted a list of affected data products on LinkedIn. These include the OnTheMap for Emergency Management system, which provides real-time population and workforce statistics for disaster zones. Other affected datasets cover quarterly workforce indicators, business formation, veteran employment, and post-secondary education outcomes.
Lynda Kellam, who leads the Research Data and Digital Scholarship team at the University of Pennsylvania Libraries, noted confusion regarding implementation. “Regarding the datasets that used noise infusion, it is unclear how this policy will impact public access,” she wrote. “The policy is intended to be retroactive, raising concerns that data might be removed, but how that will play out is uncertain.”
Some information is already gone. As Wang pointed out on Bluesky, multiple webpages on the Census Bureau site explaining noise infusion were removed following the order, though most have since been restored. Meanwhile, the Data Rescue Project, led by Lena Bohman, has begun collecting and archiving Census Bureau working papers.
Jarosz added that abandoning agreed-upon privacy methods could damage public trust. When people respond to the American Community Survey, they expect their data to remain confidential. Removing the tools used to protect that promise may cause respondents to question whether the agencies can keep their word.
America First Legal, co-founded by Stephen Miller, attempted to force the release of new 2020 Census data last year by challenging the differential privacy system. Judges ruled it was too late to sue but refiled the case in February.
Separately, the administration has pushed to exclude undocumented immigrants from the 2030 Census. “People who are in our Country illegally WILL NOT BE COUNTED IN THE CENSUS,” Trump wrote on Truth Social in August 2025.
This stance follows a long history of redistricting battles. The Supreme Court recently weakened the Voting Rights Act, allowing for more redistricting that could favour Republican control of the House ahead of the 2026 midterms.
The data policy change also coincides with cuts to Census practice test locations. In February, the Associated Press reported that the administration is eliminating four out of six locations slated to test new methods for the 2030 census.
“The Census Bureau would be essentially flying blind into communities that need testing most — tribal lands, rural areas with limited connectivity and places with historically low response rates,” Mark Mather, an associate vice president at the Population Reference Bureau, told the AP. “You can’t fix what you don’t test.”
What it means
Local governments and researchers lose the ability to track specific trends in small towns or niche industries. Without granular data, disaster relief efforts may miss vulnerable areas, and businesses may struggle to understand local market conditions. The shift from precise data to broad categories reduces the utility of public records for planning and policy making.
