Mayor Bill de Blasio challenged the results of a survey...

Mayor Bill de Blasio challenged the results of a survey showing that NYPD officers suffer from low morale and believe the city is less safe than it was before he took office, Monday, March 14, 2016. Credit: Yeong-Ung Yang

Mayor Bill de Blasio Monday challenged the results of a survey commissioned by the Patrolmen’s Benevolent Association showing tumbling morale among rank-and-file cops while Police Commissioner William Bratton called the findings “not surprising.”

De Blasio said he doesn’t “put a lot of stock” in the PBA poll and questioned how it was conducted and who participated.

“It certainly is not a survey of a majority of our officers,” he said at an unrelated Harlem event. “We’re doing a lot of the things our officers need to do their job better and our officers are responding by doing an exemplary job.”

Bratton said at a Randall’s Island event that officers have complained about morale at every police department where he’s worked, according to published reports. A 2014 survey by the NYPD also found morale had dipped, he said.

NYPD officers who participated in the survey by the PBA ranked morale at 2.49 on a scale of zero to 10, and 87 percent said the city was “less safe” in the last two years that de Blasio has been at the helm. About 6,000 PBA members participated — a response rate of close to 50 percent.

Asked about de Blasio’s comments, a PBA spokesman said the scientific methodology behind the survey and more results will be shared at a news conference Tuesday.

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