2.Basis of Presentation and Significant Accounting Policies

Basis of Presentation

All dollar amounts, except per share amounts, in the financial statements and tables in the notes are stated in thousands of dollars unless otherwise indicated.

Interim Financial Statements

Our accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”). These financial statements have not been audited by our independent registered public accounting firm.

These financial statements include the adjustments and accruals, all of which are of a normal recurring nature, necessary for a fair presentation of the results for the interim periods. These interim results are not necessarily indicative of results for a full year. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the year ended December 31, 2021.

Consolidation

We have determined that the members with equity at risk in Solaris LLC lack the authority, through voting rights or similar rights, to direct the activities that most significantly impact Solaris LLC’s economic performance; therefore, Solaris LLC is considered a variable interest entity (“VIE”). As the managing member of Solaris LLC, we operate and control the business and affairs of Solaris LLC as well as have the obligation

to absorb losses or the right to receive benefits that could be potentially significant to us. Therefore, we are considered the primary beneficiary and consolidate Solaris LLC.

Noncontrolling Interests

As of June 30, 2022, we own approximately 41% of Solaris LLC. Our consolidated financial statements include noncontrolling interests representing the percentage of Solaris LLC units not held by us.

Use of Estimates

Management has made certain estimates and assumptions that affect reported amounts in these financial statements and disclosures of contingencies. These critical estimates include, among others, determining the fair value of assets acquired and liabilities assumed in acquisitions or disposed through sale, determining the fair value and related impairment of assets held for sale, determining the fair value of assets acquired and liabilities assumed in nonmonetary exchanges, determining the fair value of performance-based restricted stock units (“PSUs”), useful lives of property, plant and equipment and amortizable intangible assets, the fair value of asset retirement obligations (“ARO”), accruals for environmental matters, the income tax provision, valuation allowances for deferred tax assets, and the liability associated with our Tax Receivable Agreement (the “TRA liability”). Management evaluates estimates and assumptions on an ongoing basis using historical experience and other factors, including current economic and industry conditions. Actual results could differ from management’s estimates as additional information or actual results become available in the future, and those differences could be material.

Significant Accounting Policies

See Note 2. Significant Accounting Policies to our consolidated financial statements in our Annual Report on Form 10-K for the year ended December 31, 2021 for the discussion of our significant accounting policies. Other than the updates noted below in Recently Adopted Accounting Pronouncements, there were no significant updates or revisions to our accounting policies during the six months ended June 30, 2022.

Fair Value Information

The fair value of our 7.625% Senior Sustainability-Linked Notes (the “Notes”), which are fixed-rate debt, is estimated based on the published market prices for the same or similar issues. Management has designated this measurement as a Level 2 fair value measurement. Fair value information regarding our debt is as follows:

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The carrying values of our financial instruments, consisting of cash, accounts receivable, and accounts payable, approximate their fair values due to the short maturity of such instruments.

Intangible Assets

Intangible assets are net of accumulated amortization of $78.5 million and $60.1 million at June 30, 2022 and December 31, 2021, respectively.

Related Parties

In 2020, we and ConocoPhillips, one of our principal owners, entered into a 13-year water gathering and handling agreement, pursuant to which ConocoPhillips agreed to dedicate all the produced water generated

from its current and future acreage in a defined area of mutual interest in New Mexico and Texas. As of June 30, 2022 and December 31, 2021, we had accounts receivable from ConocoPhillips of $21.7 million and $20.2 million, respectively, that were recorded in accounts receivable from affiliate. As of June 30, 2022 and December 31, 2021, we had payables to ConocoPhillips of $2.1 million and $1.5 million, respectively, that were recorded in payables to affiliate. Revenues and expenses related to ConocoPhillips were as follows:

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Operating expenses reimbursed to ConocoPhillips are related to ConocoPhillips’ costs for operating certain assets on our behalf between closing and the transfer of the acquired assets and other ongoing operating expenses.

Recently Adopted Accounting Pronouncements

Leases. Effective January 1, 2022, we adopted Accounting Standards Update (“ASU”) No. 2016-02: Leases and its subsequent amendments (collectively, “ASC Topic 842”). ASC Topic 842 supersedes prior accounting guidance for leases and requires, among other things, lessees to recognize substantially all right-of-use (“ROU”) assets and lease liabilities on the balance sheet. Certain practical expedients are allowed for leases with terms of 12 months or less. ASC Topic 842 also requires disclosures designed to give financial statement users information on the amount, timing, and uncertainty of cash flows arising from leases. Our adoption and implementation of ASC Topic 842 as of January 1, 2022 resulted in the recognition of right-of-use assets of $7.9 million and lease liabilities of $7.3 million.

We made policy elections not to capitalize short-term leases for all asset classes and not to separate non-lease components from lease components for all asset classes, except for real estate leases. We also did not elect the package of practical expedients that allowed for certain considerations under the original “Leases (Topic 840)” accounting standard to be carried forward upon adoption of ASU 2016-02.

ASU No. 2018-11, “Targeted Improvements,” provides a transition election not to restate comparative periods for the effects of applying the new lease standard. This transition election permits entities to change the date of initial application to the beginning of the year of adoption and to recognize the effects of applying the new standard as a cumulative-effect adjustment to the opening balance of retained earnings. We elected this transition approach; however, the cumulative impact of adoption in the opening balance of retained earnings as of January 1, 2022 was zero.

Our accounting policy for leases is as follows:

We determine whether an arrangement contains a lease based on the conveyed rights and obligations at the inception date. If an agreement contains an operating or financing lease, at the commencement date, we record a right-of-use asset and a corresponding lease liability based on the present value of the minimum lease payments.

As most of our leases do not provide an implicit borrowing rate, to determine the present value of lease payments, we use our hypothetical secured borrowing rate based on information available at lease commencement. Further, we make a number of estimates and judgments regarding the lease term and lease payments.

Lease Term ─ Leases with an initial term of 12 months or less are not recorded on the balance sheet and we recognize lease expense for these leases on a straight-line basis over the lease term. Most leases include one or more options to renew, with renewal terms that can extend the lease term from one month to one year

or more. Additionally, some of our leases include an option for early termination. We include renewal periods and exclude termination periods from our lease term if, at commencement, it is reasonably likely that we will exercise the option.

Lease Payments ─ Certain of our lease agreements include rental payments that are adjusted periodically for inflation or passage of time. These step payments are included within our present value calculation as they are known adjustments at commencement. Some of our lease agreements include variable payments that are excluded from our present value calculation.

Additionally, we have lease agreements that include lease and non-lease components, such as equipment maintenance, which are generally accounted for as a single lease component. For these leases, lease payments include all fixed payments stated within the contract. For real estate lease agreements, we account for lease and non-lease components separately. Our lease agreements do not contain any material residual value guarantees that would impact our lease payments.

See Note 7. Leases.

Financial Instruments – Credit Losses. Effective January 1, 2022, we adopted ASU 2016-13, Financial Instruments – Credit Losses and its subsequent amendments (collectively, “ASC Topic 326”). ASC Topic 326

requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The adoption of ASC Topic 326 did not have a material impact on our financial statements.