This study documents how the political hierarchy plays a significant role in determining corporate environmental governance. By conducting difference-in-differences analysis to investigate listed firms in China, this study demonstrates that local and central SOEs headquartered in jurisdictions far removed from central government supervision have worse environmental governance than POEs. Verticalization reforms implemented in 2016 enable provincial environmental protection bureaus to direct lower-level bureaus. Local governments cannot control environmental protection bureau leaders for economic development. This study finds that the corporate environmental governance of local SOEs has significantly improved following the reform, as local environmental protection bureaus no longer have conflicts of interest with local governments. However, the reform has not resulted in improvements to corporate environmental governance in central SOEs, whose executives occupy higher status than provincial Environmental Protection Bureau leaders, nor in POEs, which were already managed before the reform. Further evidence indicates that local SOEs experience an increase in abatement investments and relationship building expenses following the reform. Lastly, our study reveals that verticalization reform costs are negligible. Local SOEs have not experienced a decline in financial performance or corporate valuation. This study suggests that policymakers should consider the political ranking of government agencies and enterprises to improve environmental governance.