One of the federal government’s main efforts to push Americans to prepare for climate threats is in question after the Senate majority leader’s office objected to a plan to adjust flood insurance rates. The Federal Emergency Management Agency was preparing to announce new rates for federal flood insurance on April 1, so that the prices people pay would more accurately reflect the risks they face. The change would very likely help reduce Americans’ vulnerability to floods and hurricanes by discouraging construction in high-risk areas. But it would also increase insurance costs for some households, making it a tough sell politically.

Last week, the office of Senator Chuck Schumer of New York, the Democratic majority leader, pushed back on the changes, according to several people familiar with the discussion. That pushback has caused FEMA to pause the rollout of the new rates.

Senator Schumer objected to the flood-insurance overhaul when it was first announced in 2019, citing its potential to raise costs for people on Long Island. The new system would mean steeper rates for some high-value homes, and the southern shore of Long Island includes the Hamptons, which have some of the most expensive real estate in the country.

Senator Schumer’s office told FEMA that the new rates could have a “severe impact” on some communities in New York, according to a person familiar with the conversation. The person said that the senator’s office had asked FEMA to reconsider going forward with the plan and asked the agency for a follow-up meeting, which, as of Wednesday, had not been scheduled.