According to attorneys, 17 families (about 65 people) who live in the Autumnwood development now claim that their homes are toxic.
Attorneys representing the homeowners claim contaminated soil underneath the homes is making them sick.
They say soil testing revealed elevated levels of toxic chemicals in the ground and air including Formaldehyde, Chloroform and Benzene, a known carcinogen.
The symptoms residents have reported include long-lasting pneumonia, lung infections, chronic headaches, nosebleeds and sore throats.
The Villanueva and Muniz families are among at least three homeowners who have abandoned their properties on Amaryllis Court.
Tom Ciccarelli won't live in his home either, after his 37-year-old wife Fatima died from a bout of pneumonia just two weeks after giving birth to their daughter.
The families told KTLA they fear that their worries of chemical contamination are falling on deaf ears.
"We asked them to come out and do an investigation. They were supposed to get back to us at the end of month," said Jennifer Muniz. "Today is December 3rd and we have no answer."
So far, they've collected more than 600 signatures urging the Department of Toxic Substances to step in and test their homes.
"I know there is something there, and I know hat it's harming people and we have test results prove that, to back that up," Xonia Villanueva insisted.
Since they first shared their story with KTLA a few weeks ago, dozens of other people have come forward claiming they, too, have suffered similar symptoms.
But so far, the DTSC has yet to commit to its own independent testing.
"This is an agency that's supposed to investigate the chemicals," Villaneuva said. "They regulate them. They should investigate them. It's their job."
The DTSC told KTLA that it plans to attend an upcoming community meeting to gather more information and answer any questions.
The mayor of Wildomar said flyers will go out to residents once they set a date for the meeting -- possibly next week.
Meantime, lawyers representing the families are planning a class-action lawsuit that could be filed as early as Tuesday.