In northwest Oklahoma, the city of Enid draws drinking water from wells located just a few hundred yards from an oil field wastewater disposal operation. That proximity violates an Oklahoma state rule restricting injection operations within a half-mile of public water wells. The wastewater being injected underground can be saltier than the sea and laden with toxic metals.
The injection well in question, named the Flying Monkey, was approved by Oklahoma state regulators in 2018 without holding a required hearing to ensure the operation would not pollute groundwater supplies. In the years since its approval, the well has repeatedly failed structural integrity tests, signaling potential leak risks that could contaminate nearby drinking water sources.
The city of Enid, population roughly 50,000, now finds itself in the position of having to petition the same state regulatory body—the Oklahoma Corporation Commission—to address a violation that the commission itself authorized. Under state rules, injection operations are banned within a half-mile of public water wells unless regulators hold a hearing and determine such activity will not cause pollution.
What the Left Is Saying
Environmental advocates argue this situation illustrates broader failures in state-level regulatory oversight of oil and gas operations. Groups focused on groundwater protection say the 2018 approval without a required hearing represents a breakdown in safeguards meant to protect public water supplies from industrial contamination.
The Oklahoma Environmental Quality Council and clean water organizations have pointed to the Flying Monkey's repeated integrity test failures as evidence that existing monitoring systems, while identifying problems, are not preventing risky operations from continuing. Advocates contend that when regulators approve wells without following required procedures, they undermine the very protections the rules were designed to provide.
Some public health researchers note that communities relying on groundwater supplies have limited alternatives if contamination occurs. Once aquifers are polluted, remediation can take decades or prove impossible, making prevention more critical than after-the-fact enforcement actions.
What the Right Is Saying
Industry representatives and some state officials argue that Oklahoma's injection well program is carefully managed to balance energy production with environmental protection. They note that the state's regulatory framework includes integrity testing requirements specifically designed to detect problems before contamination occurs.
The Oklahoma Independent Petroleum Association has emphasized that oil and gas operations provide significant economic benefits to the state, including jobs and revenue for schools and infrastructure. Industry groups argue that reasonable regulation is appropriate but oppose what they characterize as overly prescriptive restrictions that could drive investment to other states.
Some conservative commentators have framed disputes over injection well proximity rules as examples of regulatory overreach that fail to account for geological realities. They note that modern injection well technology includes multiple barriers, including steel casings and cement grouting, designed to prevent fluid migration into freshwater zones.
What the Numbers Show
ProPublica and The Frontier mapped every injection well in Oklahoma to determine proximity to public water wells. Their analysis identified at least 114 injection wells statewide located within a half-mile of a public water supply well—closer than state rules permit without a hearing.
More than 300,000 Oklahomans live in communities that rely on these water wells for drinking water, according to the analysis. Enid alone has three injection wells operating within the restricted zone near its public water supply infrastructure.
The Flying Monkey well failed structural integrity tests in multiple years following its 2018 approval. State records show the Oklahoma Corporation Commission received test results indicating cement bond issues and other integrity concerns before any regulatory action was taken regarding the violation of proximity rules.
Oklahoma has approximately 10,000 active Class II injection wells used to dispose of oil and gas production wastewater, making it one of the nation's largest such programs by volume. The state processed roughly 1.5 billion barrels of wastewater through these wells in recent years, according to federal data.
The Bottom Line
Enid's situation presents a procedural Catch-22: the city must petition the Oklahoma Corporation Commission to address a violation that commission staff approved seven years ago without following required procedures. Environmental groups say this reflects a pattern where regulatory approval processes may not be catching or correcting proximity violations before they create public health risks.
The Oklahoma Corporation Commission has stated it is reviewing the matter. Any resolution would likely require either modifying the injection well's operations, requiring additional protective measures, or potentially ordering the well's closure—actions that involve both technical assessments and policy judgments about acceptable risk near public water supplies.
For Enid residents, the core question is whether existing state rules provide adequate protection when properly enforced, or whether stronger safeguards are needed to prevent industrial operations from operating too close to drinking water sources. The outcome of this case could set precedent for how Oklahoma handles similar situations involving its 114 other proximity violations statewide.