Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2025	Sep. 16, 2025
Significant Accounting Policies [Line Items]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements (“Financial Statements”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and in accordance with Rule 10-01 of Regulation S-X and reflects all adjustments, consisting of normal recurring adjustments which are, in the opinion of management, necessary for a fair statement of the financial results for the interim periods presented. Accordingly, these Financial Statements should be read in conjunction with NDB Operating's annual audited financial statements and accompanying notes for the year ended December 31, 2024, included within the Company's final prospectus filed with the SEC on September 18, 2025 (the “Prospectus”), pursuant to Rule 424(b) under the Securities Act. All dollar amounts in the Financial Statements and tables in the notes are stated in thousands of dollars unless otherwise indicated. In these Financial Statements, periods prior to the closing of the Combination on September 17, 2025, reflect the financial statements of NDB Operating and its subsidiaries. Periods subsequent to the closing of the Combination on September 17, 2025, reflect the financial statements of the consolidated Company, including WaterBridge, OpCo and its subsidiaries. Results of operations for the three and nine months ended September 30, 2025 are not necessarily indicative of the results of operations that will be realized for the year ending December 31, 2025. Consolidation We have determined that the members with equity at risk in OpCo lack the authority, through voting rights or similar rights, to direct the activities that most significantly impact OpCo’s economic performance; therefore, OpCo is considered a variable interest entity. As the managing member of OpCo, we operate and control all of the business and affairs of OpCo and also 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 OpCo for accounting purposes. These Financial Statements include the accounts of the Company, OpCo and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated upon consolidation.
Noncontrolling Interest	Noncontrolling Interest Our Financial Statements include a noncontrolling interest representing the percentage of OpCo Units not held by us. The noncontrolling interest is subject to change in connection with various equity transactions such as issuances of Class A shares, the redemption of Class B shares (and corresponding OpCo Units) for Class A shares, or the cancellation of Class B shares (and corresponding OpCo Units).
Segment Information	Segment Information Operating segments are defined as components of an enterprise for which separate financial information is available and regularly evaluated by the Chief Operating Decision Maker (“CODM”) for the purpose of making key operating decisions, allocating resources, and assessing operating performance. The Company operates as one operating and reportable segment. The Company is managed as a whole rather than through discrete operating segments. Our executive team is organized by function, rather than legal entity, with no business component manager reporting directly to the CODM. Allocation of resources is made on a project basis across the Company without regard to geographic area, and considers among other things, return on investment, current market conditions, including commodity prices and market supply, availability of services and human resources, and contractual commitments. The Company’s Chief Executive Officer is the CODM who allocates resources and assess performance based upon financial information at the consolidated level. All of our revenues are generated in the United States and all of our tangible long-lived assets, which consist of property, plant and equipment, are located in the United States. The measure of segment assets is reported on our condensed consolidated balance sheets as total assets. Total expenditures for additions to long-lived assets is reported on our condensed consolidated statements of cash flows. The measure of profit and loss regularly provided to the CODM that is most consistent with U.S. GAAP is net income, as presented in our condensed consolidated statements of operations. The Company presents all of its significant segment expenses and other metrics as used by the CODM to make decisions regarding the Company’s business, including resource allocation and performance assessment in our condensed consolidated statements of operations.
Acquisitions	Acquisitions To determine if a transaction should be accounted for as a business combination or an asset acquisition, we first calculate the relative fair value of the assets acquired. If substantially all of the relative fair value is concentrated in a single asset or group of similar assets, or, if not, but the transaction does not include a significant process (that is, does not meet the definition of a business), the transaction is recorded as an asset acquisition. We record asset acquisitions using the cost accumulation model. Under the cost accumulation model of accounting, the cost of the acquisition, including certain transaction costs, are allocated to the assets acquired using relative fair values. All other transactions are recorded as business combinations. We record the assets acquired and liabilities assumed in a business combination at their acquisition date fair values. Transactions in which we acquire control of a business are accounted for under the acquisition method. The identifiable assets, liabilities and any noncontrolling interests are recorded at the estimated fair value as of the acquisition date. The purchase price in excess of the fair value of assets acquired and liabilities assumed is recorded as goodwill.
Fair Value Measurements	Fair Value Measurements Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Whenever available, fair value is based on or derived from observable market prices or parameters. When observable market prices or inputs are not available, unobservable prices or inputs are used to estimate the fair value. The three levels of the fair value measurement hierarchy are as follows: • Level 1: Quoted market prices in active markets for identical assets or liabilities. • Level 2: Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. • Level 3: Unobservable inputs that are not corroborated by market data. The carrying value of the Company’s cash and cash equivalents, accounts receivable, net of current expected credit losses, and accounts payable and accrued liabilities reported on the condensed consolidated balance sheets approximate fair value due to their highly liquid nature or short-term maturity. The Company adjusts the carrying amount of certain non-financial assets, property, plant and equipment and definite-lived intangible assets, to fair value on a non-recurring basis when impaired. The fair value of debt is the estimated amount the Company would have to pay to transfer its debt, including any premium or discount attributable to the difference between the stated interest rate and market rate of interest at the balance sheet date. The estimated fair value of our debt approximates the principal amount outstanding because the interest rates applicable to such amounts are variable and reflective of market rates and the debt may be repaid, in full or in part, at any time without penalty. Refer to Note 7 — Debt.
Share-Based Compensation	Share-Based Compensation Restricted Share Units In connection with the IPO, the Board adopted the WaterBridge Infrastructure LLC Long Term Incentive Plan (the “LTIP”). The LTIP allows for the grant of options, share appreciation rights, restricted share units (“RSUs”), share awards, dividend equivalents, other share-based awards, cash awards, substitute awards, or any combination thereof. There are 5,700,000 Class A shares reserved and available for delivery under the LTIP, subject to increase on January 1 of each calendar year by a number of shares equal to the lesser of 5% of the total number of Class A shares and Class B shares outstanding as of December 31 of the immediately preceding calendar year; the number of shares required to bring the total shares available for issuance under the LTIP to 5% of the total number of Class A shares and Class B shares outstanding as of December 31 of the immediately preceding calendar year; or such smaller number of shares as determined by the Board. RSUs issued to participants are recorded on grant date at fair value. Expense is recognized on a straight-line basis over the requisite service period (generally the vesting period of the award) as either other operating and maintenance expense or general and administrative expense in the condensed consolidated statements of operations. We have elected to account for forfeitures as they occur. Therefore, compensation cost previously recognized for an award that is forfeited because of failure to satisfy a service condition will be reversed in the period of the forfeiture. RSUs include dividend equivalent rights that permit holders of granted but unvested RSUs to receive nonforfeitable distributions alongside common equity holders of the Company as if such RSUs were granted as of the applicable record date for such distribution. See Note 9 — Share-Based Compensation for additional information.
Interest Capitalization	Interest Capitalization The Company capitalizes interest costs mainly during the construction period of its assets. Upon placing the underlying asset in service, these costs are depreciated over the estimated useful life of the corresponding assets for which interest costs were incurred.
Earnings (Loss) Per Share Attributable to WaterBridge	Earnings (Loss) Per Share Attributable to WaterBridge We use the two-class method in our computation of earnings per share. Our RSUs include dividend equivalent rights that permit holders of granted but unvested RSUs to receive a non-forfeitable cash amount equal in value to dividends paid with respect to an equal number of shares and are contemplated as participating when the Company is in a net income position. These awards participate in dividend equivalents on a basis equivalent to other Class A shares but do not participate in losses. Basic earnings (loss) per share (“EPS”) of our Class A shares is computed on the basis of the weighted average number of shares outstanding during each period. The diluted EPS of our Class A shares contemplates adjustments to the numerator and the denominator under the if-converted method for the convertible Class B shares. The Company uses the treasury stock method or two-class method when evaluating dilution for RSUs. The more dilutive of the two methods is included in the calculation for diluted EPS.
Recent Accounting Pronouncements Not Yet Adopted	Recent Accounting Pronouncements Not Yet Adopted In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740). This guidance further enhances income tax disclosures, primarily through standardization and disaggregation of rate reconciliation categories and income taxes paid by jurisdiction. We plan to adopt this guidance and comply with the disclosure requirements when it becomes effective for our 2025 annual report. We are currently assessing the impact of this standard on our Financial Statements and related disclosures. In November 2024, the FASB issued ASU 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40). This guidance requires tabular disclosure of specified natural expenses in certain expense captions, a qualitative description of amounts that are not separately disaggregated, and disclosure of the Company's definition and total amount of selling expenses. We plan to adopt this guidance and comply with the disclosure requirements when it becomes mandatorily effective for annual periods beginning after December 15, 2026. We are currently assessing the impact of this standard on our Financial Statements and related disclosures.
WBEF
Significant Accounting Policies [Line Items]
Basis of Presentation and Consolidation		Basis of Presentation and Consolidation The accompanying unaudited condensed consolidated financial statements (“Financial Statements”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and in accordance with Rule 10-01 of Regulation S-X and reflects all adjustments, consisting of normal recurring adjustments which are, in the opinion of management, necessary for a fair statement of the financial results for the interim periods presented. Accordingly, these Financial Statements should be read in conjunction with the Company’s annual audited financial statements and accompanying notes for the year ended December 31, 2024, included within the Company's final prospectus filed with the SEC on September 18, 2025 (the “Prospectus”), pursuant to Rule 424(b) under the Securities Act. All dollar amounts in the Financial Statements and tables in the notes are stated in thousands of dollars unless otherwise indicated. The Company has presented the Financial Statements from the beginning of the year to September 16, 2025, the date immediately preceding the Combination. All of the Company’s subsidiaries are wholly owned, either directly or indirectly through wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. There were no variable interest entities for any periods presented herein. Basic and diluted net income per common unit is not presented since the ownership structure of the Company is not a common unit of ownership. On occasion, the Company, through its wholly owned subsidiaries, enters into joint operating agreements (“JOA”) pursuant to which third parties receive non-operating undivided interests in one or more produced water handling facilities and related assets subject to the JOA. The undivided interest owners (i) receive their proportionate share of revenue and (ii) pay for their proportionate share of all costs and expenses incurred in drilling, equipping, installing, and operating the JOA assets. The JOAs are not separate legal entities; rather, each undivided interest received by the parties to the JOA is an undivided ownership interest in the applicable assets. The Company records its undivided interests related to these JOAs and records revenues and expenses related to these disposal activities on a net basis as part of revenues and costs and expenses. JOA revenues and costs and expenses are subject to audit by all non-operating parties, or such other entity that the non-operator authorizes to conduct the audit, generally limited to the preceding two years following the end of a calendar year. When necessary, reclassifications are made to prior period financial information to conform with current year presentation.
Segment Information		Segment Information Operating segments are defined as components of an enterprise for which separate financial information is available and regularly evaluated by the Chief Operating Decision Maker (“CODM”) for the purpose of making key operating decisions, allocating resources, and assessing operating performance. The Company operates as one operating and reportable segment. The Company is managed as a whole rather than through discrete operating segments. Our executive team is organized by function, rather than legal entity, with no business component manager reporting directly to the CODM. Allocation of resources is made on a project basis across the Company without regard to geographic area, and considers among other things, return on investment, current market conditions, including commodity prices and market supply, availability of services and human resources, and contractual commitments. The Company’s Chief Executive Officer is the CODM who allocates resources and assesses performance based upon financial information at the consolidated level. All of our revenues are generated in the United States and all of our tangible long-lived assets, which consist of property, plant and equipment, are located in the United States. The measure of segment assets is reported on our consolidated balance sheets as total assets. Total expenditures for additions to long-lived assets is reported on our consolidated statements of cash flows. The measure of profit and loss regularly provided to the CODM that is most consistent with U.S. GAAP is net income, as presented in our consolidated statements of operations. The Company presents all of its significant segment expenses and other metrics as used by the CODM to make decisions regarding the Company’s business, including resource allocation and performance assessment in our consolidated statements of operations.
Income Taxes		Income Taxes The Company is a limited liability company classified as a pass-through entity for federal income tax purposes. As a result, the net taxable income of the Company and any related tax credits, for federal income tax purposes, are deemed to pass to the members and are included in their tax returns even though such net taxable income or tax credits may not have actually been distributed. The Company is subject to Texas margin taxes. We estimate our state tax liability utilizing management estimates related to the deductibility of certain expenses and other factors.
Fair Value Measurements		Fair Value Measurements Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Whenever available, fair value is based on or derived from observable market prices or parameters. When observable market prices or inputs are not available, unobservable prices or inputs are used to estimate the fair value. The three levels of the fair value measurement hierarchy are as follows: • Level 1: Quoted market prices in active markets for identical assets or liabilities. • Level 2: Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. • Level 3: Unobservable inputs that are not corroborated by market data. The carrying value of the Company’s cash and cash equivalents, accounts receivable, net of current expected credit losses, and accounts payable and accrued liabilities reported on the consolidated balance sheets approximate fair value due to their highly liquid nature or short-term maturity. The fair value of debt is the estimated amount the Company would have to pay to transfer its debt, including any premium or discount attributable to the difference between the stated interest rate and market rate of interest at the balance sheet date. The estimated fair value of our debt approximates the principal amount outstanding because the interest rates applicable to such amounts are variable and reflective of market rates and the debt may be repaid, in full or in part, at any time without penalty. Refer to Note 5 — Debt.
Share-Based Compensation		Share-Based Compensation The Company accounts for share-based compensation expense for incentive units granted in exchange for employee services. Our management and employees currently participate in two equity-based incentive plans, managed by WBR and WB II, both indirect parents of the Company. The WBR plan (“WBR Plan”) is governed by the Amended and Restated LLC Agreement of WBR, dated as of June 24, 2019 (the “WBR LLC Agreement”) and the WB II plan (“WaterBridge II Plan”) is governed by the Amended and Restated Limited Liability Company Agreement of WB II, dated as of June 24, 2019 (the “WB II LLC Agreement” and collectively with the WBR LLC Agreement, the “WBR and WB II LLC Agreements”). The management incentive units consist of time-based awards of profits interests in both WBR and WB II (the “Incentive Units”), and each of the WBR and WB II LLC Agreements authorizes the issuance of 10,000 Incentive Units. The Incentive Units represent a substantive class of equity for WBR and WB II and are accounted for under FASB ASC 718, Compensation — Stock Compensation. Features of the Incentive Units include the ability for WBR and WB II to repurchase Incentive Units during a 180-day option period, whereby the fair value price is determined as of the termination date, not the repurchase date, which temporarily takes away the rights and risks and rewards of ownership from the Incentive Unit holder during the option period. Under ASC 718, a feature for which the employee could bear the risks, but not gain the rewards, normally associated with equity ownership requires liability classification. WBR and WB II classifies the Incentive Units as liability awards. The liability related to the Incentive Units is recognized at WBR and WB II as the entity’s responsible for satisfying the obligations. Share-based compensation expense pushed down to the Company is recognized as a deemed non-cash contribution to members’ equity on the consolidated balance sheets. The share-based compensation expense is recognized consistent with WBR and WB II’s classification of a liability award resulting in the initial measurement, and subsequent remeasurements, recognized ratably over the vesting period. The Incentive Units’ value is derived from a combination of its threshold value and the total value of the incentive pools. The value of the incentive pools are determined by taking the total value returned to WBR and WB II Series A unit holders and allocating such value between the Series A unit holders and the incentive pools based on a return-on-investment waterfall included in the WBR and WB II LLC Agreements. The total value returned constitutes any cash or property distributed by the Company or other WBR or WB II subsidiary to WBR and WB II Series A unit holders. The total incentive pools are determined by summing the discrete Incentive Unit burden of each Series A unit holder. Value allocation within the Incentive Unit pools is impacted by Incentive Unit threshold values but the aggregate value of each incentive pool is based solely on the return-on-investment waterfall. The Incentive Unit liability is only applicable to WBR and WB II Series A unit holders. Value within each Incentive Unit pool is allocated among Incentive Unit holders via a distribution waterfall. The units with the lowest threshold value within the pool will be allocated value first. Once the value of the units with the lowest threshold value reaches the next lowest threshold value, the lowest threshold value units will cease earning value. The next lowest threshold value Incentive Units then receive value until its value is equal to its own threshold value (the “Catch-Up Mechanics”). At this point, both the lowest and second lowest threshold value units have a value equal to the second lowest threshold value. Both groups of units continue to earn value until this value is equal to the third lowest threshold value, when the Catch-Up Mechanics are applied. When all Incentive Units have earned value up to the highest threshold value, all Incentive Units will earn value pro rata based on the total number of units issued thereafter. At each reporting period, WBR and WB II Incentive Units are remeasured at their fair value, consistent with liability award accounting, using a Monte Carlo Simulation. The Monte Carlo Simulation requires judgment in developing assumptions, which involve numerous variables. These variables include, but are not limited to, the expected unit price volatility over the term of the awards, the expected dividend yield and the expected life of Incentive Unit vesting. The vested portion of the WBR and WB II Incentive Unit liability is allocated to the Company as share-based compensation expense on the consolidated statements of operations. The Company updates its assumptions each reporting period based on new developments and adjusts such amounts to fair value based on revised assumptions, if applicable, over the vesting period. For the period January 1, 2025 through September 16, 2025 and the nine months ended September 30, 2024, the fair values of the Incentive Units were estimated using various assumptions as discussed in Note 8 — Share-Based Compensation. The fair value measurement is based on significant inputs not observable in the market, and thus represents Level 3 inputs within the fair value hierarchy. Unvested Incentive Units are subject to accelerated vesting if there is a change in control (as defined in the award agreements). Unvested Incentive Units are also subject to accelerated vesting or forfeiture in certain circumstances as set forth in the award agreements and 1/3 of all vested Incentive Units are subject to forfeiture if an Incentive Unit holder is terminated for cause. Upon termination for any reason, WaterBridge I and WaterBridge II have the right to purchase all vested Incentive Units of the terminated Incentive Unit holder for a period of 180 days at the fair market value on the date the Incentive Unit holder’s employment ended. Forfeitures are accounted for upon occurrence. Forfeitures do not return equity value to the Company, rather value is returned to the Incentive Unit pool and allocated among remaining Incentive Unit holders. All Incentive Units are subject to time-based vesting, and vest to the participant over the course of the vesting period at the fair value of the vested grants at each reporting date. The risk-free rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of each award and updated at each balance sheet date for the time period approximating the expected term of such award. The expected distribution yield is based on no previously paid distributions and no intention of paying distributions on the Incentive Units for the foreseeable future. Due to the Company not having sufficient historical volatility, the Company uses the historical volatilities of publicly traded companies that are similar to the Company in size, stage of life cycle and financial leverage. The Company will continue to use this peer group of companies unless a situation arises within the group that would require evaluation of which publicly traded companies are included or once sufficient data is available to use the Company’s own historical volatility. For criteria dependent upon a change in control, the Company will not recognize any incremental expense until the event occurs. Differences between actual results and such estimates could have a material effect on the Financial Statements. Distributions attributable to WBR and WB II Incentive Units are based on returns received by investors of WBR and WB II, as applicable, once certain return thresholds have been met. WBR and WB II Incentive Units are solely a payment obligation of WBR and WB II, as applicable, and neither the Company nor its subsidiaries has any cash or other obligation to make payments in connection with the WBR or WB II Incentive Units.
Mezzanine Equity		Mezzanine Equity The Company classifies certain equity instruments as mezzanine equity on the balance sheet when such instruments contain redemption features that are not solely within the control of the Company or its subsidiaries in accordance with ASC 480-10-S99-3A. As of December 31, 2024, the Company presented its Redeemable Series A Preferred Units and Redeemable Series B Preferred Units as mezzanine equity in the condensed consolidated financial statements. Redeemable equity securities are initially recognized at their fair value on the issuance date. Subsequent accounting is outlined below depending on whether the instrument is: (i) currently redeemable, (ii) probable of becoming redeemable, or (iii) not probable of becoming redeemable. • Currently Redeemable: If the instrument is currently redeemable (e.g., at the option of the holder), it is subsequently remeasured to its maximum redemption amount at each reporting date. • Probable of Becoming Redeemable: If the instrument is not currently redeemable but is probable of becoming redeemable (e.g., when redemption depends solely on the passage of time), the Company has the option to either a) adjust the carrying amount by accreting to the redemption value over time, using the effective interest method or b) recognize changes in the redemption value immediately as they occur and adjust the carrying amount of the instrument to equal the redemption value at the end of each reporting period. • Not Probable of Becoming Redeemable: If the instrument is neither currently redeemable nor probable of becoming redeemable, no subsequent remeasurement is required. Distributions declared but not yet paid increase the carrying value of the instrument and are recognized in members’ equity. The Company evaluates mezzanine equity instruments at each reporting period to determine if reclassification to permanent equity or liability treatment is required under ASC 480 — Distinguishing Liabilities from Equity, or ASC 815 — Derivatives and Hedging. If a mezzanine classified equity instrument becomes mandatorily redeemable, it is reclassified as a liability and measured at fair value, and any changes in fair value are recorded through earnings. The fair value measurement is based on significant inputs not observable in the market, and thus represents Level 3 inputs within the fair value hierarchy.
Interest Capitalization		Interest Capitalization The Company capitalizes interest costs mainly during the construction period of our assets. Upon placing the underlying asset in service, these costs are depreciated over the estimated useful life of the corresponding assets for which interest costs were incurred.

Acquisitions

Share-Based Compensation

WaterBridge Infrastructure LLC 10-Q