Climate advocates say an overhaul of the nation’s flood insurance program being unveiled by the Trump administration will spur communities around the country to better plan for extreme weather, but could drive up costs for some homeowners.

The changes announced on March 18 by the Federal Emergency Management Agency represent one of the most significant reforms in the history of the National Flood Insurance Program. It will tie premiums to the actual flood risk facing individual homes nationwide starting in October 2020. The current system sets prices based largely on whether a home is inside or outside of the 100-year flood plain.

“This is badly needed,” said Shana Udvardy, a climate resilience analyst for the Union of Concerned Scientists. She called the shift “a huge step in the right direction, so we can let communities, particularly those communities that have been repetitively flooded, know what their actual risk is.”

But the change risks increasing costs in the most flood-exposed areas, Udvardy cautioned. “We also have concerns about affordability,’’ she said. “How do we protect those people that are historically disadvantaged and low-income, and that are also on the front lines of flooding?’’

The initiative, which FEMA calls Risk Rating 2.0, follows a string of catastrophic events, including the Baton Rouge flood in 2016, Hurricanes Harvey and Irma in 2017 and Hurricane Florence last year. In each of those events, a large share of damaged homes lacked flood insurance, in part because FEMA’s current system didn’t accurately measure their risk.

“We have too much disaster suffering because we don’t have insured survivors,” David Maurstad, FEMA’s deputy associate administrator for insurance and mitigation, said in a phone interview on March 15. He said the recent disasters spurred the agency to improve its risk identification, mapping and prices, and use those prices as a signal for homeowners.

“The new rating plan will help customers better understand their risks,” Maurstad said. “I believe that will actually increase the demand for our product.”

The overwhelming majority of American households with flood coverage receive their policies through the National Flood Insurance Program, which covers about 5 million policyholders, including approximately 3.5 million single-family homes. Despite the growing risk of flooding due to climate change, the number of policies under the program has fallen about 10 percent from its peak in 2009.

The pricing overhaul comes as climate change places growing pressure on the publicly subsidized flood insurance program. Claims often outpace premiums, saddling the program with a debt that topped $30 billion in 2017. The models that determine those rates ignore certain kinds of flooding, like heavy precipitation. And many Americans at risk of flooding nonetheless don’t buy insurance.

Maurstad said the agency doesn’t yet know what effect the change will have on total premiums. “We’re not going to design it to either increase or decrease revenue,” he said on March 15. “Our effort is to improve our product and price it more fairly.”

In a follow-up email, FEMA press secretary Elizabeth Litzow said the new approach could have the effect of raising total revenue, by accounting for new types of flood risk.

“Risk Rating 2.0 will be introducing new sources of flooding, such as intense rainfall, that have not been previously considered in the rating structure,” Litzow wrote. “While these new sources of flooding have a lesser impact on risk and rates than those already considered, their introduction could result in the increased premium levels.”

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