The boundary of this report covers all ONEOK operations, unless otherwise noted. Environmental data represents 100% of ONEOK operating assets. Safety and health data represents all ONEOK employees, unless otherwise noted. This report presents the material issues and impacts during the fiscal year ending Dec. 31, 2019, unless otherwise noted. Reports from previous years are available online at


To help guide ONEOK’s environmental, social and governance (ESG) performance disclosures, we reference both the Global Reporting Initiative (GRI) and Sustainability Accounting Standards Board (SASB) standards for voluntary ESG reporting. For SASB reporting, ONEOK references the Extractives and Minerals Processing Sector – Oil and Gas Midstream (EM-MD, Version 2018-10) standard. View detailed disclosures under the GRI and SASB Reporting section of our website.


ONEOK’s Corporate Sustainability Report is prepared by a collaboration among corporate business segments with final review and approval by ONEOK executive management. We engaged an external third party to perform attest procedures for certain environmental and safety metrics disclosed in ONEOK’s Performance Data Table and in this report for the period Jan. 1, 2019, to Dec. 31, 2019. The external third-party report is available at


ONEOK conducted a materiality assessment in 2018 to identify the issues that matter most to our business and stakeholders. The assessment process followed the recommended practices outlined by the GRI to understand topics that reflect our company’s significant ESG impacts, or those that would substantively influence the assessment and decisions of stakeholders. We reviewed sustainability reporting frameworks, peer company reports, industry association guidance and media sources to identify industry-specific topics of significance. We then identified the materiality of issues based on the following criteria:

  • Frequency a topic was raised by stakeholders.
  • Likelihood and ability of a topic to impact our business objectives.
  • How the business’ performance around a topic affects stakeholders.

As part of this process, we led a workshop to validate the material findings and identify topics that are most critical to the success of our business and stakeholder interests. We also periodically review the alignment of the results with ONEOK’s strategic plans.

Material ESG topics identified include (in alphabetical order):


  • Air emissions.
  • Ecological impact.
  • Effluent management.
  • Energy management.
  • Environmental compliance.
  • Greenhouse gas (GHG) emissions and climate change.
  • Producer flaring.
  • Product stewardship.
  • Remediation and decommissioning.
  • Spills and releases.
  • Waste management.
  • Water supply and compliance.


  • Attraction and retention.
  • Contractor and supplier management.
  • Diversity and inclusion.
  • Human capital development.
  • Human rights.
  • Labor management relations.
  • Occupational health and safety.
  • Pipeline and process safety.
  • Security practices.
  • Stakeholder engagement.


  • Board leadership and diversity.
  • Community investments.
  • Comprehensive enterprise risk management.
  • Corporate compliance and ethics.
  • Corporate governance.
  • Customer policy.
  • Investor engagement.
  • Political advocacy.
  • Public policy.
  • Shareholder relations.
  • Tax policy.



Megan Patterson, manager – investor relations
918-561-5325 | Email


Brad Borror, manager – communications
918-588-7582 | Email