CA AB3155

Establishes presumptive joint and several liability for oil and gas operators/owners for respiratory ailments in seniors and children, preterm births, high-risk pregnancies, and cancer diagnoses in persons domiciled more than 24 cumulative months in a health protection zone (area within 3,200 feet of sensitive receptors) with diagnoses after January 1, 2025.

Provides affirmative defenses if operators deploy best available technology and remediation efforts without interruption, or present evidence the facility was not the cause of the health condition.

Authorizes the Attorney General, district attorneys, county counsel, and city attorneys to bring civil actions for reimbursement of health care expenditures and impose civil penalties of $250,000 to $1,000,000 per affected person, with potential doubling or tripling of penalties if necessary for deterrence.

Requires 30-day notice to public prosecutors before private settlements or motions to dismiss can be effective and voids any settlement provisions that prohibit disclosure of settlement terms or reporting allegations to government officials.

Declares all waivers of these provisions void and unenforceable and establishes these duties as cumulative and in addition to all other existing legal obligations.