The fee only pertains to those purchased online or by phone, as those who visit the World Trade Center in person for a same-day pass can enter for free.
"They're making money off the people that died. It's disgusting," Jim Riches, a retired FDNY deputy chief who lost his son in the attack, said.
Joe Daniels, the Memorial President, said that it is only temporary and is helping support operation costs.
"Like other similar institutions, in order to help support the operational needs of the 9/11 memorial we have implemented a service fee, solely for advance reservations," Daniels said.
The memorial was paid for by tax grants and private donations, totaling to about $700 million.
A website for the memorial said that the service fee will remain until construction projects are finished. Once it is completed, they estimate that the memorial will cost about $60 million to operate each year.
The site is not yet complete due to a disagreement between the foundation and the Port Authority about funding.
It opened in 2011 and features two reflecting pools with waterfalls representing the foundations of the towers. Seven million people have visited it. The museum will have portraits of most of the victims and will also include artifacts.