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The 2017 DC Construction Codes Supplement, based on the 2015 I-Code Family, including the 2015 IRC, was adopted on 5/21/2020 and became effective upon publication in the DC Register on 5/29/2020. Although DC replaces IRC Chapter 1 with its amended IBC Chapter 1, its amended IBC Chapter 1 includes flood-resistant administrative provisions either within Chapter 1 itself or by a reference to Appendix G within Chapter 1. DC has begun reviewing the 2021 I-Codes for adoption by 2023. (3/16/2021)