Keeping Flood Insurance Affordable Act of 2013

[AI summary unavailable — showing source text] Keeping Flood Insurance Affordable Act of 2013 - Prohibits the Administrator of the Federal Emergency Management Agency (FEMA) from: (1) increasing flood insurance risk premium rates to reflect the current risk of flood for certain property located in specified areas subject to a certain mandatory premium adjustment, or (2) reducing such subsidies for any property not insured by the flood insurance program as of July 6, 2012, or any policy that has lapsed in coverage as a result of the policyholder's deliberate choice (Pre-Flood Insurance Rate Map or pre-FIRM properties). Sets forth expiration dates for such prohibitions. Amends the National Flood Insurance Act of 1968 (NFIA) to prohibit FEMA from providing flood insurance to prospective insureds at rates less than those estimated for any property purchased after the expiration of such six-month period (currently, any property purchased after July 6, 2012). Prohibits FEMA from reducing flood insurance risk premium rate subsidies for one non-primary residential property of an owner, with an appraised value that does not exceed $1 million. Applies the same prohibition with respect to business properties, except that any single busine…