ECOLAB INC

Conclusion Regarding the Effectiveness of Disclosure Controls and Procedures* *

As of December 31, 2023, we carried out an evaluation, under the supervision and with the participation of our management, including our Chairman and Chief Executive Officer and our Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Securities Exchange Act of 1934 as amended). Based upon that evaluation, our Chairman and Chief Executive Officer and our Chief Financial Officer concluded that, as of December 31, 2023, our disclosure controls and procedures were effective.

Management’s Report on Internal Control Over Financial Reporting

Refer to page 47 of this Annual Report for “Management’s Report on Internal Control Over Financial Reporting.”

Report of Registered Public Accounting Firm

Refer to page 48 of this Annual Report for the “Report of Independent Registered Public Accounting Firm.”

Changes in Internal Control Over Financial Reporting.

During the period October 1, 2023 through December 31, 2023 there were no changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

We are continuing our implementation of our enterprise resource planning (“ERP”) system upgrades, which are expected to occur in phases over the next several years. These upgrades, which include supply chain and certain finance functions, are expected to improve the efficiency of certain financial and related transactional processes. These upgrades of the ERP systems will affect the processes that constitute our internal control over financial reporting and will require testing for effectiveness.