The water system of a South Bronx housing development tested positive for Legionnella on Wednesday—not far from where the fatal Legionnaires outbreak took place last month. The mayor was in the Bronx on Thursday urging calm. 

The hot water in Charlie Ramirez's apartment was off on Thursday afternoon. 

"I got to take a bath every day. Night and morning," Ramirez says.

At the recommendation of the Centers for Disease Control and Prevention, new water filters were installed. 

"That's the new filter they put in. And that one," Ramirez says.

Ramirez lives in the Melrose Houses in the South Bronx and his building's hot water system just tested posted for the bacteria that causes Legionnaires' Disease. Four people have had the disease in Melrose Houses in the last six months. 

The most recent diagnosis was last week.

"That patient is currently hospitalized and recovering," Mayor Bill de Blasio said.

Briefing members of the media just 16 blocks from the development, the mayor and his health commissioner downplayed the situation. The positive result they said was a quote "faint positive" and those results are preliminary. More tests are being done.

"Now it was a very faint positive result but out of an abundance of caution we decided that in that one building we would take additional steps," the mayor said.

This public housing development is just six blocks from the site of last month's Legionnaires' outbreak in the South Bronx, which killed twelve people. 

Officials say the do not know if the most recent case came from that contaminated site. 

"Someone can have it and walk around with it for a period of time and thank god not contagious," de Blasio said.

Nonetheless, officials are taking action at the development. Officials from the health department were posted in front of Ramirez's building handing out fliers.

"A longer term decontamination is being planned based on additional tests that we get as we move forward," said Health Commissioner Dr. Mary Bassett. "They should not be concerned drinking the water. Our drinking water is safe."

City officials tell us that the water at Melrose houses is completely safe to drink, but residents we spoke to including Ramirez say they are opting for bottled water instead of the tap.

"I just don't want to get sick. I don't want to die," he says.

The city says more test results are expected this week.