Hazard Mitigation Assistance, United States, 1999–2024

Delivery performance of grant-funded hazard mitigation construction

Portfolio-level results for 14,906 physical mitigation projects funded through FEMA Hazard Mitigation Assistance, with post-award obligation ledgers reconstructed from 139,378 OpenFEMA financial transactions and delivery time estimated with right censoring retained. Every statistic is computed from public records.

4.20 yr
Kaplan-Meier median time from initial approval to closeout
92.0%
of completed, competitively awarded projects exceeded their proposed period of performance (median growth 2.59×)
43.2%
finish more than 5% below their initial award; 18.0% finish more than 5% above
30%
of the variance in delivery time lies between administering states
Obligation outcomes

Under-delivery rather than cost overrun

A grant award is an authorization that can be reduced before closeout, so a delivery shortfall appears as deobligation rather than as cost growth. The final-to-initial obligation ratio is asymmetric around 1.0: 43.2% of projects finish more than 5% below their award and 18.0% more than 5% above it, and 68.3% are deobligated at least once.

Final obligation relative to initial award

Final-to-initial obligation ratio, share of projects, clipped at .3 and 1.5
Descoped >5% · 43.2%Held within ±5% · 38.8%Grew >5% · 18.0%

Deobligation incidence by mitigation family

Share of projects with at least one deobligation; dashed line, portfolio rate
Incidence is highest for property acquisition (85.1%), where delivery depends on the continued participation of private owners after the award, and lowest for the families dominated by equipment procurement.