We have updated the map based on new reports from our readers.
A couple readers commented on our website and Facebook page saying they first heard the “explosion like noise” in January. Most reports said that the noise was heard during nighttime. Some people claimed they have heard it multiple times a day.
“I've heard repeated short blast sounds on Sunday mornings when local and traffic noise is very low,” W Nickman commented our website.
Some residents living in the south side of Alhambra said they have heard the noise and think the source is on the north side. Residents from San Marino, South Pasadena and El Monte said they have heard similar noises, but they can’t determine the source.
“El Monte residents also complain about the same issue,” Teresa Arroyo commented on our Facebook page.
Some readers think the noise might be from fireworks. “I first heard it back in January, so i thought it was leftover fireworks being lit,” John W commented on our website. But others said the noise is louder than a regular firework explosion. A few residents said they have not heard the noises since the recent power outrage, which happened two weeks ago.
Jayson Chan, a resident living on Stoneman Ave, told the Source in a Facebook message that he thinks the noise might be from the malfunctioning heater furnace in his building. “I believe it may be the heater furnace. There is a delay in ignition so the gas builds up and creates a loud explosion,” wrote Chan. He doesn’t have the evidence to prove it, though he has reported it to the APD and his homeowner’s association. He says the furnace will soon be inspected by professionals.
“I know this sounds weird. But since living in Alhambra every other night or so I hear a loud explosion like noise, ” Noelle Dominguez wrote Feb 16 on Nextdoor.com, a community social media site. Other residents replied to her post and reported hearing the same kind of noise.
A couple readers have also commented on the Source’s Facebook page saying they have heard similar noises at different locations in Alhambra recently, but neither of them had a good guess about the cause of the sounds. The Alhambra Police Department posted on their Facebook page saying they have also received reports about an unidentified “explosion like noise." The Alhambra Fire Department does not have information about the noise, and Southern California Edison told the APD they have not had any reports of outages or blown transformers.
According to the Alhambra Public Works Department, there are ongoing construction projects on Valley Boulevard, but the department does not believe that the projects are the source of the noises. No construction-related explosions have been conducted recently, according to the department. The Aviation Division of the County of Los Angeles Department of Public Works said they do not have an explanation for the noise either.
The Source has created a map based on the reports from our readers. The red markings indicate the approximate locations where readers have heard the noises. If you have heard a similar noise or believe you know the cause of it, please comment below and report to the APD at (626) 570-5151.