California Residents Sue Landfill Operator Over Toxic Gases and Odors

Dozens of residents in Avenal, California, have filed a federal lawsuit against Waste Connections US Inc. and Madera Disposal Systems Inc., alleging that the Avenal Regional Landfill is emitting toxic gases and noxious odors that are harming their health and diminishing their quality of life. The lawsuit, filed by approximately 43 residents and workers, claims the landfill has created a dangerous nuisance impacting homes, health, and daily living.

The 173-acre landfill is situated in the northern part of Avenal, with residences, schools, parks, and businesses located nearby. According to the suit, the facility is approximately 500 feet from the closest home, and the entire community of about 14,000 people lives within 1.5 miles of the site.

Plaintiffs allege that persistent odors and gases originating from landfill gas and leachate have caused them to experience headaches, nosebleeds, breathing difficulties, dizziness, concentration problems, and heart issues. The lawsuit states that some residents have felt compelled to remain indoors, forgo using their yards, and keep windows and doors closed, even in favorable weather, due to concerns about exposure to "toxic chemicals with unknown short- and long-term health effects." Some residents have expressed worry about allowing their children to play outside or attend school.

The legal action unfolds against a backdrop of political turmoil in Avenal. The city's mayor and four council members, who were previously recalled by voters in April over concerns including the city's fire department and transparency, had unlawfully continued to serve until a Superior Court judge ruled in August that their tenure was invalid.

The Avenal Regional Landfill has a long history in the community, with its origins tracing back to Standard Oil's waste disposal practices in 1929. Avenal eventually took over operations before transferring daily management to Madera Disposal in 2002. Waste Connections later assumed operational control.

Records indicate a history of regulatory scrutiny. The Kings County Local Enforcement Agency reportedly investigated numerous odor complaints between 2020 and August 2026. The San Joaquin Valley Air Pollution Control District has also addressed hundreds of complaints over several years, many related to odors, dust, or open burning.

In one 2020 investigation, the agency examined odors that residents linked to health problems. California air regulators have documented landfill-related odors during surveillance operations, and the lawsuit notes that federal and state agencies have investigated elevated temperatures and gas emissions at the site.

CalRecycle has reportedly recorded landfill gas readings exceeding 145 degrees Fahrenheit since 2024, with some measurements surpassing 160 degrees. Carbon monoxide readings in several wells reportedly reached as high as 3,420 parts per million. The lawsuit highlights that temperatures above 145 degrees can suggest a subsurface fire, and CalRecycle has stated that carbon monoxide concentrations above 1,500 parts per million "strongly suggest" such a fire.

The plaintiffs are seeking damages for alleged injuries and property losses, along with medical monitoring and an injunction. The requested injunction could potentially lead to remediation efforts, increased monitoring, or the permanent closure of the landfill. The complaint asserts that the defendants' actions have been "intentional, willful, malicious, oppressive, and made with a conscious disregard for the rights or safety of Plaintiffs."