Oasis Petroleum Hid Injection Data, Risked Tribal Water for $3,681 Fine
For two consecutive years, Oasis Petroleum North America LLC failed to report critical saltwater injection volumes at a disposal well on the Fort Berthold Indian Reservation, endangering drinking water sources for the Mandan, Hidatsa, and Arikara Nation while facing only a nominal penalty.
Oasis Petroleum operated a saltwater disposal well on the Fort Berthold Indian Reservation and repeatedly failed to report lifetime cumulative injection volumes required by its EPA permit. The company submitted incomplete annual reports in both 2023 and 2024, omitting data essential for protecting underground drinking water sources. Despite two years of noncompliance that put tribal water supplies at risk, the EPA assessed a penalty of only $3,681, a sum dwarfed by the operational profits from continued injection activities.
This case shows how minimal penalties enable corporations to treat environmental violations as routine business expenses while communities bear the health risks.
The Allegations: A Breakdown
| 01 | Oasis Petroleum failed to include lifetime cumulative injected volume in its 2022 Annual Monitoring Report, which was due February 15, 2023 but submitted incomplete on February 27, 2023. The permit explicitly required this data to monitor well pressure and potential contamination risks to underground drinking water sources. | high |
| 02 | The company repeated the same violation in 2024, submitting its 2023 Annual Monitoring Report on March 7, 2024 without the required lifetime cumulative injected volume. This marked two consecutive years of the identical reporting failure. | high |
| 03 | Oasis Petroleum did not provide the missing lifetime cumulative injection volume data until August 14, 2024, more than 18 months after the first deadline and only after EPA enforcement proceedings had commenced. The company operated the injection well throughout this period without regulatory oversight of cumulative volumes. | high |
| 04 | The Rupple 1-4 SWD injection well is located within the exterior boundaries of the Fort Berthold Indian Reservation, where the Mandan, Hidatsa, and Arikara Nation exercises governmental jurisdiction. The tribe has not assumed primary enforcement responsibility under the Safe Drinking Water Act, leaving protection to the EPA. | high |
| 05 | The company violated 40 C.F.R. Section 144.51(a), which requires Underground Injection Control permit holders to comply with all permit conditions. Any permit noncompliance constitutes a violation of the Safe Drinking Water Act and provides grounds for enforcement action. | high |
| 06 | Oasis Petroleum is a corporation operating as a class II saltwater disposal well operator. The well disposes of brines and byproducts from oil and gas extraction activities by injecting them deep underground into geological formations. | medium |
| 01 | The EPA assessed a civil penalty of only $3,681 for two years of consecutive violations that endangered tribal drinking water sources. The Safe Drinking Water Act authorized penalties up to $13,946 per day of violation, with a maximum administrative penalty of $348,671 for violations in this time period. | high |
| 02 | The agency did not discover or act on the first violation until the second violation had already occurred. Oasis submitted its incomplete 2022 report in February 2023, but the EPA did not finalize enforcement until after the company also failed to submit complete 2023 data in early 2024. | high |
| 03 | The consent agreement imposed no operational restrictions, required no well modifications, and mandated no independent auditing of future reports. The company paid the fine and continued operating the injection well under the same permit conditions. | high |
| 04 | The EPA administers the federal Underground Injection Control program in areas where Indian tribes exercise governmental jurisdiction but have not assumed primary enforcement responsibility. The MHA Nation depends entirely on EPA enforcement to protect reservation water resources from injection well contamination. | high |
| 05 | The violation was resolved through a Combined Complaint and Consent Agreement that simultaneously commenced and concluded the enforcement proceeding. Oasis agreed not to contest the allegations and waived its right to a hearing, avoiding any public adjudication of the facts. | medium |
| 06 | The consent agreement explicitly states that completion of its terms resolves only the company’s liability for federal civil penalties for the alleged violations. It does not address the ongoing risk to drinking water sources or require remediation of any potential contamination. | medium |
| 01 | The $3,681 penalty represents a fraction of the daily operational value of a saltwater disposal well in an active oil production region. A single disposal well can process thousands of barrels per day, with disposal fees and avoided trucking costs potentially exceeding the total penalty in a matter of days or weeks. | high |
| 02 | Oasis Petroleum acquired the well from QEP Energy Company in February 2022 through a permit revision. The company took ownership knowing the exact reporting requirements but failed to comply with basic permit conditions for both complete years it operated under EPA oversight. | high |
| 03 | The company delayed submitting complete data for 18 months after the first deadline, continuing to inject saltwater without full regulatory scrutiny of cumulative volumes. During this period, regulators could not assess whether injection rates threatened well integrity or endangered underground sources of drinking water. | high |
| 04 | By omitting lifetime cumulative injection volumes, Oasis Petroleum prevented the EPA from evaluating the total stress on the geological formation. Cumulative volume data is essential for determining whether a disposal well is approaching capacity limits that could cause formation fracturing or fluid migration. | high |
| 05 | The consent agreement does not require the company to pay restitution to the MHA Nation, fund water quality monitoring, or contribute to any remediation fund. The entire penalty flows to the federal treasury while the tribal community continues bearing the environmental risk. | medium |
| 06 | Oasis Petroleum agreed that all alleged violations had been corrected by the time of the settlement. However, the company implemented no structural changes to prevent future reporting failures, relying instead on assurances of improved internal processes. | medium |
| 01 | The Safe Drinking Water Act’s Underground Injection Control program exists specifically to prevent underground injection that endangers drinking water sources. Oasis Petroleum’s failure to report cumulative volumes directly undermined this protective purpose by denying regulators essential monitoring data. | high |
| 02 | Saltwater disposal wells inject brines and byproducts of oil and gas extraction deep underground. These fluids often contain heavy metals, radioactive isotopes, and chemical additives that pose severe contamination risks if they migrate into aquifers used for drinking water. | high |
| 03 | Without accurate lifetime cumulative volume data, regulators cannot assess whether a disposal well is over-pressurizing the receiving formation. Excess pressure can cause formation fracturing, creating pathways for injected fluids to migrate vertically into shallower drinking water aquifers. | high |
| 04 | The Fort Berthold Indian Reservation community relies on underground water sources for household uses, irrigation, and tribal cultural practices. Contamination from injection well failures could render these water sources unusable for generations, given the persistence of heavy metals and radioactive materials. | high |
| 05 | High-volume saltwater injection can trigger induced seismicity by increasing pore pressure in geological formations. Earthquake activity linked to injection wells has been documented in multiple states, with some regions experiencing dramatic increases in seismic events correlating with disposal well operations. | medium |
| 06 | The permit requires annual monitoring reports by February 15 to allow the EPA to review injection activities while they are ongoing. Delayed and incomplete reports prevent timely intervention if injection volumes or pressures indicate emerging threats to underground sources of drinking water. | medium |
| 07 | Once aquifer contamination occurs, remediation is extremely difficult and expensive. Groundwater moves slowly through geological formations, meaning contamination can persist and spread for decades before detection. Prevention through accurate monitoring is the only effective protection strategy. | medium |
| 01 | The Mandan, Hidatsa, and Arikara Nation exercises governmental jurisdiction over the Fort Berthold Indian Reservation but has not assumed primary enforcement responsibility for Underground Injection Control. The tribe depends entirely on EPA enforcement to protect reservation water resources from oil and gas industry contamination. | high |
| 02 | Indigenous communities throughout North America face a documented pattern of environmental injustice where industrial operations occur on or near tribal lands without robust oversight or free, prior, and informed consent. Companies often target these regions due to favorable terms and perceived regulatory loopholes. | high |
| 03 | The Fort Berthold Indian Reservation is located in the Bakken Shale oil production region of North Dakota. The reservation hosts extensive oil and gas extraction and disposal operations, creating cumulative environmental burdens that disproportionately impact the MHA Nation community. | high |
| 04 | The trust relationship between the federal government and tribal nations obligates agencies like the EPA to provide rigorous environmental protection on reservation lands. Delayed enforcement and minimal penalties undermine this trust responsibility and leave tribal communities vulnerable to corporate misconduct. | high |
| 05 | The consent agreement does not require Oasis Petroleum to consult with the MHA Nation, fund tribal environmental monitoring programs, or provide the tribe with enhanced access to well operation data. Tribal authorities have no increased oversight despite the repeated violations occurring on reservation land. | medium |
| 06 | Environmental harms on tribal lands perpetuate wealth disparity and health inequities that indigenous communities have faced for generations. Oil and gas companies extract billions in resource value while externalizing environmental and health costs onto tribal populations with limited economic resources to respond. | medium |
| 01 | The consent agreement allowed Oasis Petroleum to resolve the enforcement action without admitting or denying the specific factual allegations. The company admitted only the jurisdictional basis for EPA authority, avoiding any public acknowledgment of wrongdoing. | high |
| 02 | Oasis Petroleum waived its right to contest the allegations and appeal the proposed order, enabling the EPA to simultaneously commence and conclude the enforcement proceeding. This expedited process avoided any evidentiary hearing or public examination of the company’s compliance practices. | high |
| 03 | The agreement explicitly states it does not relieve Oasis Petroleum of the duty to comply with applicable laws or restrict EPA’s authority to seek future compliance. However, it imposes no enhanced monitoring, no third-party auditing, and no structural reforms to prevent recurrence. | high |
| 04 | The EPA determined the settlement was in the public interest and that the $3,681 penalty was appropriate after considering factors including seriousness of violation, economic benefit from violation, and the company’s history of violations. The record does not explain how such a minimal penalty serves the public interest. | high |
| 05 | If Oasis Petroleum fails to pay the penalty, the EPA may refer the debt to collection agencies, seek administrative offset through withheld federal payments, or request the Attorney General file a civil action. However, the agreement does not provide for enhanced penalties or operational restrictions for future violations. | medium |
| 06 | The consent agreement binds Oasis Petroleum’s officers, directors, employees, agents, and successors. However, the company must only provide written notice and a copy of the agreement to successors prior to transferring the well, with no requirement for EPA approval of such transfers. | medium |
| 07 | Nothing in the agreement limits EPA’s power to pursue injunctive relief, equitable remedies, or criminal sanctions for violations, or to take action in response to imminent and substantial endangerment. However, such actions would require separate proceedings and the agency has already accepted this minimal settlement. | medium |
| 01 | Oasis Petroleum submitted its 2022 Annual Monitoring Report 12 days late, on February 27, 2023, already demonstrating disregard for permit deadlines. The company then compounded this by omitting the required lifetime cumulative injected volume from the late submission. | high |
| 02 | The company repeated the identical omission in its 2023 report submitted on March 7, 2024, again missing the February 15 deadline. This pattern demonstrates that the first violation did not prompt any meaningful internal compliance review or corrective action. | high |
| 03 | Between February 2023 and August 2024, Oasis Petroleum operated the injection well for 18 months without providing regulators the cumulative volume data required by its permit. During this entire period, the company continued generating revenue from disposal operations while avoiding full regulatory scrutiny. | high |
| 04 | The EPA did not file the Combined Complaint and Consent Agreement until November 18, 2024, nearly two years after the first incomplete report. This delay allowed the company to complete two full injection cycles without consequences while the agency worked through its enforcement process. | high |
| 05 | The consent agreement provides that it becomes effective only when a final order is filed with the regional hearing clerk. The agreement itself was signed on September 26, 2024 by the EPA and September 25, 2024 by Oasis, but the formal filing occurred later, further extending the timeline. | medium |
| 06 | The Safe Drinking Water Act and EPA regulations required public notice and reasonable opportunity for comment before finalizing the consent agreement. This process, while important for transparency, added additional time before any penalty was imposed for violations that began in early 2023. | medium |
| 01 | Oasis Petroleum violated its EPA permit for two consecutive years by failing to report data essential for protecting drinking water sources on the Fort Berthold Indian Reservation. The company faced a penalty of $3,681, a sum that fails to deter future violations or compensate for the environmental risk imposed on the MHA Nation. | high |
| 02 | The case demonstrates how minimal penalties and delayed enforcement enable corporations to treat environmental violations as routine business expenses. When fines are negligible compared to operational profits, companies face no meaningful economic incentive to invest in robust compliance systems. | high |
| 03 | Indigenous communities bear disproportionate environmental burdens from oil and gas operations on or near tribal lands while receiving minimal protection from underfunded federal agencies. The trust responsibility between the United States and tribal nations demands far more rigorous enforcement than this case demonstrates. | high |
| 04 | The consent agreement imposed no operational restrictions, required no enhanced monitoring, and mandated no structural reforms to prevent recurrence. Oasis Petroleum paid a nominal fine and continues operating the injection well under the same permit conditions that it previously violated. | high |
| 05 | Lifetime cumulative injection volume data is not an administrative technicality but a critical safeguard against aquifer contamination and induced seismicity. By withholding this information for 18 months, Oasis Petroleum prevented regulators from assessing whether the well posed emerging threats to public health and safety. | high |
| 06 | The case exemplifies how neoliberal capitalism prioritizes corporate profits over community welfare. Companies externalize environmental and health costs onto vulnerable populations while regulatory agencies lack the resources and authority to impose consequences that would alter corporate behavior. | medium |
| 07 | Without stronger enforcement mechanisms, mandatory transparency requirements, and penalties proportional to corporate revenue, this pattern will continue. Communities and tribal nations need regulatory systems designed to prevent harm rather than merely document it after the fact. | medium |
Timeline of Events
Direct Quotes from the Legal Record
“The SDWA authorizes the EPA to administer the currently applicable federal UIC program in areas over which an Indian Tribe exercises governmental jurisdiction until the Tribe assumes primary enforcement responsibility.”
💡 The MHA Nation has no choice but to rely on EPA enforcement since the tribe has not assumed primary responsibility for Underground Injection Control on the reservation.
“The SDWA authorizes the EPA to assess a civil penalty of not more than $13,946 for each day of violation, up to a maximum administrative penalty of $348,671, for violations occurring after November 2, 2015, where penalties are assessed on or after December 27, 2023.”
💡 The EPA had authority to impose penalties up to $348,671 but assessed only $3,681, demonstrating enforcement that fails to match the severity of violations endangering tribal water.
“Respondent submitted its 2022 Annual Monitoring Report on February 27, 2023. The 2022 Annual Monitoring Report lacked the required lifetime cumulative injected volume.”
💡 Oasis submitted the report 12 days late and omitted critical data required by the permit, beginning a pattern of noncompliance.
“Respondent submitted its 2023 Annual Monitoring Report on March 7, 2024. The 2023 Annual Monitoring Report lacked the required lifetime cumulative injected volume.”
💡 The company repeated the identical violation in the following year, demonstrating systemic disregard for permit requirements rather than isolated error.
“Respondent submitted the lifetime cumulative injected volume as of the end of 2023 on August 14, 2024.”
💡 Oasis provided the required data only after 18 months of noncompliance and only after EPA enforcement proceedings had begun.
“The Well has latitude of 47.836159 and longitude of -102.212987 and is located within the exterior boundaries of the Fort Berthold Indian Reservation.”
💡 The violations occurred on land under tribal jurisdiction, placing environmental burdens directly on the MHA Nation community.
“Part 144 requires UIC permittees to comply with all conditions of their permit and provides that any permit noncompliance constitutes a violation of the SDWA and is grounds for enforcement action, for permit termination, revocation and reissuance, or modification, or for denial of a permit renewal application.”
💡 Federal regulations make clear that permit violations are serious matters warranting strong enforcement, yet this case resulted in minimal consequences.
“The Permit, at section II(D)(4), requires Respondent to submit an annual report (Annual Monitoring Report) containing a summary of monitoring data for each calendar year to the EPA by February 15 of the following calendar year.”
💡 Annual monitoring reports exist to enable regulators to detect threats to drinking water sources before contamination occurs, making timely and complete submission essential.
“For the purpose of this proceeding, Respondent: admits the jurisdictional allegations in this Agreement; neither admits nor denies the specific factual allegations in this Agreement.”
💡 The consent agreement allowed Oasis to settle without acknowledging wrongdoing, avoiding any public admission that could be used in future litigation or enforcement.
“In accordance with the Consolidated Rules of Practice, completion of the terms of this Agreement resolves only Respondent’s liability for federal civil penalties for the violations alleged in Section V, above.”
💡 The settlement closes the enforcement case after payment of a nominal fine, with no requirement for operational changes or enhanced protections for tribal water sources.
“Respondent: waives any right to contest the allegations and any right to appeal the proposed final order accompanying this Agreement; acknowledges that the EPA has provided an opportunity for a hearing and waives any right to a hearing in this proceeding.”
💡 By waiving hearing rights, Oasis avoided any public examination of its compliance practices or the reasons for repeated violations.
“Respondent agrees, by signing this Agreement, that all alleged violations have been corrected.”
💡 The company claims to have corrected violations, but the agreement imposes no independent verification, third-party auditing, or enhanced monitoring to prevent recurrence.
“Nothing in this Agreement shall relieve Respondent of the duty to comply with all applicable provisions of the Act, any regulation, order, or permit issued pursuant to the Act, and any other federal, state, or local laws.”
💡 The agreement reiterates existing legal obligations but imposes no new requirements, meaning Oasis continues operating under the same conditions it previously violated.
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