The average time required to complete an environmental impact statement from 2010-2018 was 4.5 years
During this nine-year period, federal agencies completed 1,276 environmental impact statements. More than 70% of the studies were done in two to five years. Factors that affect the time required to conduct an EIS include the type, scope and complexity of the proposed project.
Bar chart showing the distribution of EIS completion times from 2010-2018, with values ranging from 1 to 17 years. More than 70% of the studies fall in the 2-5 year range.
