On September 2nd, 2026, an initiative to enact the Environmental Liability Law of the State of Guerrero was published before the Parliamentary Gazette of the Congress of the State of Guerrero presented by Congresswoman Obdulia Naranjo Cabrera of the Ecologist Green Party of Mexico (PVEM). The bill seeks to give the state a specialized legal and procedural framework for the remediation of, and compensation for, environmental damage.
The bill rests on a core premise: environmental damage must be remediated even where no direct financial loss to a specific person can be shown. Broadly, it brings the model of the 2013 Federal Environmental Liability Law (LFRA) to the state level. Guerrero would thus join states such as Michoacán, Sonora, Coahuila and Quintana Roo, which already have their own environmental liability statutes.
If approved, the law would increase exposure to environmental claims for companies operating in Guerrero. The impact would be greatest for mining and extractive companies and, more generally, for any business whose activities carry potential environmental impacts.
Key Provisions
The proposed framework prioritizes effective ecosystem restoration over purely financial or punitive responses. It even provides that monetary penalties be allocated entirely to restoration and biodiversity conservation. Its main provisions are:
- Comprehensive remediation: responsible parties would have to carry out technical measures to restore, recover, remediate or rehabilitate affected ecosystems. Where restoration is materially or technically impossible, environmental compensation would apply.
- Broader standing: state residents, qualifying environmental organizations and certain state and municipal authorities could bring claims.
- Strict and fault-based liability: both regimes would coexist. For certain activities, such as those requiring state environmental impact authorization, liability could arise without proof of fault or negligence.
- Precautionary measures: courts could order measures during proceedings, including the suspension of business operations.
- Monetary penalties: legal entities could face fines of up to 600,000 UMA (Unit of Measure and Update), approximately MXN 70.4 million at the 2026 UMA value, for certain intentional unlawful acts. These fines would apply in addition to remediation obligations.
Corporate Liability and Environmental Compliance
One of the bill’s most significant features is that companies would be liable for acts or omissions of their representatives, directors, employees, or third parties acting on their behalf or for their benefit. Parties that engage or induce a third party to carry out the conduct causing the damage would also be jointly and severally liable.
The bill provides an exception to joint and several liability. It applies where a company can show that, for at least three years before the harmful conduct, it had internal control mechanisms, an environmental management system, ongoing training and financial guarantees in place. This timeframe matters: a compliance program put in place after the damage would not qualify as a defense.
Environmental compliance therefore becomes more than a preventive tool. It is a line of defense that must be built and documented in advance.
Implications for the Mining Industry
The law’s actual reach will depend on how it interacts with the LFRA and with the allocation of authority under the General Law of Ecological Balance and Environmental Protection (LGEEPA). Mineral exploration, extraction and processing generally fall under federal jurisdiction. As a result, the most direct impact of a state law would likely be on activities under state authority, such as aggregate quarries, roads, and works and facilities subject to state environmental review. Contractors and suppliers would also be directly affected.
Even so, mining companies’ exposure would be significant:
- Remediation obligations could include technical assessments, restoration plans, soil and water remediation, and monitoring programs.
- Joint and several liability for third parties is especially relevant in an industry that relies heavily on contractors.
- The possibility of precautionary measures against operations is a factor that should be weighed in project continuity planning.
In any dispute, historical environmental information would carry decisive evidentiary weight. This includes baseline studies, environmental impact assessments, monitoring and operational records, and evidence of compliance.
How Should Companies Prepare?
We recommend adopting a preventive strategy now, covering:
- Regulatory review: confirm the validity and scope of federal and state environmental authorizations and the obligations they impose.
- Compliance programs: strengthen environmental management systems, prevention programs and response protocols, and document how they operate.
- Technical records: keep monitoring records, sampling results, environmental studies and compliance evidence up to date and securely preserved.
- Contractors and third parties: assess risks arising from work performed by third parties and review contractual provisions on environmental compliance, indemnification and insurance.
- Financial assurance: evaluate whether insurance and guarantees are adequate to cover potential remediation obligations.
- Legislative monitoring: follow committee review, potential amendments and eventual approval of the bill.
Monitoring the Legislative Process
The bill is at an early stage and remains subject to the Committee’s and the Congress review, debate, potential amendments and a floor vote. It is not the first bill of its kind in Guerrero: bills with similar contents were introduced in 2019 and 2022. Its final scope will depend on the text ultimately enacted, if any, and on how it interacts with existing federal and state environmental frameworks.
At ALN Mining Law Firm, we help mining companies identify regulatory risks, assess their environmental obligations and design preventive strategies that strengthen legal certainty and support the continuity of their operations.
ALN Mining Law Firm
Francisco Javier Andujo Tarango
Partner
Associate
