(CNN) Coastal communities across the United States saw an uptick in flooding from high tides last year -- and it's not likely to get any better, the National Oceanic and Atmospheric Administration says.

In a report Wednesday, the agency says that last year tied the 2015 record for a national median of five days of high-tide flooding. Twelve locations broke flooding records, including Washington, Annapolis and Baltimore.

The agency cited El Niño and rising sea levels as reasons why "it no longer takes a strong storm or hurricane to cause flooding in many coastal areas" and warned that people should expect even more in the future.

The effects of high-tide flooding include disrupted traffic along East Coast roadways, degraded septic system functionality in South Florida and salted farmlands in coastal Delaware and Maryland, the NOAA said.

NOAA has identified more than 40 locations where high-tide flooding trends reveal "significant acceleration" along the West and East coasts. The data suggests that coastal impacts will soon become "chronic rather than sporadic."

Read More