(CNN) Puerto Ricans were alarmed this week to hear that the Federal Emergency Management Agency planned to halt new shipments of food and water to the island -- and some assumed that meant FEMA was going to stop providing aid.

"Seriously, are they leaving?" San Juan Mayor Yulin Cruz asked on Twitter on Tuesday.

But FEMA was not planning to leave, nor stop handing out crucial supplies, the agency stressed. Distribution of its stockpiled 46 million liters of water and four million meals and snacks will continue on the island. The agency believes that amount is sufficient until normalcy returns.

Puerto Rico's Secretary of Public Safety and state coordinating officer Hector Pesquera agreed Wednesday that the commonwealth has sufficient supplies -- though he said the day before that "we were not informed that supplies would stop arriving, nor did the government of Puerto Rico agree with this action."

'The numbers just don't add up'

Meanwhile, many Puerto Ricans are still waiting for relief -- and some are skeptical that FEMA's stockpile will be enough.

"The numbers just don't add up," said Jorge Pratts, a full-time volunteer with Operation Blessing, who oversees the US nonprofit's operations in Puerto Rico. The group has distributed 35,000 water filters since Hurricane Maria hit. Pratts was in the town of Salinas on Wednesday, rebuilding a barber shop destroyed in the storm.

Pratts says he still sees people who are desperately in need of water, even in the capital of San Juan.

"The cry for help comes from fathers and mothers, people in their 60s, 70s and 80s," he said. "It's a very, very delicate situation that we're going through. FEMA is not being sensitive at all, and they're not understanding what's going on here."

'We are still in disaster mode'

Utuado, another mountainous community where Maria wiped out bridges and left communities isolated for weeks, is still very dependent on FEMA's relief aid, the mayor says.

Mayor Ernesto Irizarry says 71% of the 33,000 residents do not have power. More than 30% don't have clean water.

"For now, we have enough supplies," Irizarry said.

The mayor says they have enough supplies to last about another week, and he is confident FEMA will continue to provide supplies. But if FEMA's stockpile on the island runs out, his municipality would likely face a "humanitarian crisis."

Photos: Hurricane Maria slams the Caribbean Photos: Hurricane Maria slams the Caribbean An apartment building is missing a wall in San Juan, Puerto Rico, on Monday, September 25, nearly a week after Hurricane Maria devastated the US commonwealth. Power is still out in most places, and communications remain almost nonexistent on the island of 3.4 million people. Hide Caption 1 of 36 Photos: Hurricane Maria slams the Caribbean Yancy Leon rests at the Luis Muñoz Marin International Airport near San Juan on September 25. She's been waiting in line for two days to get a flight out. Hide Caption 2 of 36 Photos: Hurricane Maria slams the Caribbean An aerial view shows the flooding in San Juan on September 25. Hide Caption 3 of 36 Photos: Hurricane Maria slams the Caribbean People collect water from a natural spring created by landslides in Corozal, Puerto Rico, on Sunday, September 24. Puerto Rican Gov. Ricardo Rosselló said the island faces a humanitarian crisis. Hide Caption 4 of 36 Photos: Hurricane Maria slams the Caribbean An aerial view shows a flooded neighborhood in Catano, Puerto Rico, on Friday, September 22. Hide Caption 5 of 36 Photos: Hurricane Maria slams the Caribbean A man cleans a muddy street in Toa Baja, Puerto Rico, on September 22. Hide Caption 6 of 36 Photos: Hurricane Maria slams the Caribbean A man walks on a highway divider while carrying his bicycle through San Juan, Puerto Rico, on Thursday, September 21. Hide Caption 7 of 36 Photos: Hurricane Maria slams the Caribbean A shack is destroyed in San Juan on September 21. Hide Caption 8 of 36 Photos: Hurricane Maria slams the Caribbean A gas station's sign is damaged in Punta Cana, Dominican Republic, as the hurricane passed just north of the country on September 21. Hide Caption 9 of 36 Photos: Hurricane Maria slams the Caribbean Rescue workers drive through a flooded road in Humacao, Puerto Rico, on Wednesday, September 20. Hide Caption 10 of 36 Photos: Hurricane Maria slams the Caribbean A mattress that fell from the third floor is surrounded by debris outside a San Juan apartment complex on September 20. Hide Caption 11 of 36 Photos: Hurricane Maria slams the Caribbean Damage is seen in Roseau, Dominica, on September 20. Hide Caption 12 of 36 Photos: Hurricane Maria slams the Caribbean People walk through the destruction in Roseau on September 20. Hide Caption 13 of 36 Photos: Hurricane Maria slams the Caribbean San Juan is shrouded in darkness after the hurricane knocked out power to the entire island of Puerto Rico. Hide Caption 14 of 36 Photos: Hurricane Maria slams the Caribbean Power lines are scattered across a road in Humacao, Puerto Rico, on September 20. Hide Caption 15 of 36 Photos: Hurricane Maria slams the Caribbean Residents move aluminum panels from an intersection in Humacao on September 20. Hide Caption 16 of 36 Photos: Hurricane Maria slams the Caribbean Rescue vehicles are trapped under an awning in Humacao on September 20. Hide Caption 17 of 36 Photos: Hurricane Maria slams the Caribbean Trees are toppled outside the Roberto Clemente Coliseum in San Juan on September 20. Hide Caption 18 of 36 Photos: Hurricane Maria slams the Caribbean Members of a rescue team embrace as they wait to help in Humacao on September 20. Hide Caption 19 of 36 Photos: Hurricane Maria slams the Caribbean A tree is damaged in Fajardo, Puerto Rico, on September 20. Hide Caption 20 of 36 Photos: Hurricane Maria slams the Caribbean Debris is strewn across a Fajardo street on September 20. Hide Caption 21 of 36 Photos: Hurricane Maria slams the Caribbean A woman closes her property in Naguabo, Puerto Rico, hours before Maria's arrival. Hide Caption 22 of 36 Photos: Hurricane Maria slams the Caribbean People take shelter at Puerto Rico's Humacao Arena on Tuesday, September 19. Hide Caption 23 of 36 Photos: Hurricane Maria slams the Caribbean Two girls play on cots at the Humacao Arena. Hide Caption 24 of 36 Photos: Hurricane Maria slams the Caribbean Waves crash in San Juan as the hurricane neared Puerto Rico on September 19. Hide Caption 25 of 36 Photos: Hurricane Maria slams the Caribbean People pray in Humacao on September 19. Hide Caption 26 of 36 Photos: Hurricane Maria slams the Caribbean A street is flooded in Pointe-a-Pitre, on the French Caribbean island of Guadeloupe, on September 19. Hide Caption 27 of 36 Photos: Hurricane Maria slams the Caribbean People stand near debris at a restaurant in Le Carbet, Martinique, on September 19. Hide Caption 28 of 36 Photos: Hurricane Maria slams the Caribbean People in Luquillo, Puerto Rico, board up windows of a business on September 19. Hide Caption 29 of 36 Photos: Hurricane Maria slams the Caribbean A boat is overturned off the shore of Sainte-Anne, Guadeloupe, on September 19. Hide Caption 30 of 36 Photos: Hurricane Maria slams the Caribbean Cars line up at a gas station in San Juan on September 19. Hide Caption 31 of 36 Photos: Hurricane Maria slams the Caribbean A motorist drives on the flooded waterfront in Fort-de-France, Martinique, on September 19. Hide Caption 32 of 36 Photos: Hurricane Maria slams the Caribbean Floodwaters surround cars in Pointe-a-Pitre on September 19. Hide Caption 33 of 36 Photos: Hurricane Maria slams the Caribbean Soldiers patrol a street in Marigot, St. Martin, as preparations were made for Maria on September 19. Hide Caption 34 of 36 Photos: Hurricane Maria slams the Caribbean People buy provisions in Petit-Bourg, Guadeloupe, as the hurricane approached on Monday, September 18. Hide Caption 35 of 36 Photos: Hurricane Maria slams the Caribbean Customers wait in line for power generators at a store in San Juan on September 18. Hide Caption 36 of 36

"Utuado is not in recovery mode," he said. "We are still in disaster mode because we don't have access to basic services."

He was not able to watch President Donald Trump's State of the Union address Tuesday night because he was meeting with a struggling community in Utuado that still does not have access to clean water. Irizarry wasn't surprised that Trump only mentioned Puerto Rico once in his speech and didn't recount any stories from the island like he mentioned from wildfires in California and Hurricane Harvey in Texas.

"He does not know Utuado," Irizarry said. "They didn't take him to towns like Utuado during his visit. They took him to Guaynabo that will never compare to the devastation in my town."