Every day, thousands of gallons of high-salinity wastewater sit with nowhere safe to go, and for one fast-growing Colorado municipality, that problem was about to become a regulatory crisis.
A growing municipality in Northern Colorado needed to manage high-salinity wastewater generated by a reverse osmosis system. The solution involved designing and permitting a deep injection well supported by detailed reservoir evaluation and engineering. The result was a high-capacity, compliant disposal system that safely injects wastewater deep underground while protecting surface and groundwater resources.
The Challenge
- Reverse osmosis treatment generated high-salinity wastewater requiring safe disposal
- No existing underground injection expertise from the selected contractor
- Need to support a large-scale water system with up to five million gallons per day capacity
- Strict EPA Class I permitting requirements for deep injection wells
- Location within a floodway requiring careful site and facility design
- Requirement to protect underground sources of drinking water through proven containment
Our Approach
Reservoir Evaluation and Site Selection
A detailed subsurface analysis identified a deep Paleozoic formation suitable for injection between 9,500 and 11,000 feet. This ensured sufficient capacity and long-term containment of injected fluids using advanced oilfield data analytics.
EPA Class I Permitting Strategy
A comprehensive permitting application was developed that exceeded EPA requirements. This included plume modeling, geologic analysis, and long-term monitoring planning to ensure regulatory compliance and environmental protection.
Well Design and Drilling Execution
The well was engineered to maximize injectivity and operational lifespan. The design incorporated a highly micro fractured injection zone and an uncemented slotted liner to reduce injection pressure and improve long-term performance, aligning with best practices in well performance analysis.
Injection System Engineering and Automation
A fully automated injection system was designed, including horizontal centrifugal pumps, filtration, and storage capacity to manage a full day of wastewater production. The system continuously monitors tank levels and injection pressures to prevent spills and maintain safe operations.
Floodway-Resilient Facility Design
All critical equipment was positioned above the floodway through coordinated civil and engineering design, ensuring operational reliability even in high-risk environmental conditions.
Advanced Logging and Monitoring
A spectral log analysis was developed and approved to capture high-resolution in-situ salinity data across formations, improving understanding of reservoir behavior and supporting long-term monitoring.
Results
- Approximately 500,000 gallons per day of wastewater disposal capacity achieved
- Injection performed at depths of approximately 2 miles below surface
- Zero discharge of wastewater into lakes, rivers, or streams
- Successful EPA drilling permit and final injection approval obtained
- Reduced injection pressures leading to extended well life
- Fully automated system minimizing operational risk and environmental exposure
- Scalable infrastructure capable of supporting future system expansion
Why It Matters
Wastewater disposal is one of the most underestimated constraints in municipal water system planning, and it’s a problem that’s only going to grow. According to the UN World Water Development Report, global water demand is projected to increase by 20 to 30% above current levels by 2050. Municipal RO systems typically recover around 80 to 85% of inlet flow as clean water, meaning 15 to 20% of every gallon processed becomes high-salinity concentrate that can’t be discharged into a river or stream. For many communities, that’s where the planning stops and the regulatory risk begins.
Deep injection wells are one of the most reliable long-term solutions available, but they’re far from common. According to the EPA’s Underground Injection Control program, only approximately 800 operational Class I wells exist across the United States. Obtaining one requires navigating some of the most stringent permitting requirements in environmental regulation, and doing it wrong is costly.
This project demonstrates what’s possible when reservoir analysis, well engineering, and regulatory strategy are integrated from day one rather than treated as separate workstreams. The result was a fully permitted, high-capacity disposal system that protects water resources, scales with demand, and reduces long-term operational costs.
For operators facing similar constraints, the core lesson is straightforward: disposal capacity is a growth constraint, and the right underground solution, engineered and permitted correctly from the start, turns regulatory liability into long-term operational advantage.
A Class I injection well is designed for the disposal of hazardous or industrial fluids deep underground. It ensures fluids are injected into isolated formations far below drinking water sources, making it a critical solution for wastewater from processes like reverse osmosis and certain hydraulic fracturing consulting applications.
Reservoir evaluation determines the formation’s ability to accept and contain injected fluids. Proper analysis improves injectivity, reduces pressure buildup, and ensures long-term containment, which is essential for both well performance analysis and regulatory approval.
Higher injectivity allows fluids to be injected at lower pressures, reducing stress on the formation and extending well life. Design choices like slotted liners and targeting fractured zones directly impact injectivity and operational efficiency.
Advanced oilfield data analytics helps model plume movement, assess formation properties, and optimize well placement and design. This reduces uncertainty and improves both regulatory success and operational performance.
Injection wells are designed with multiple layers of protection, including geologic barriers and monitoring systems. Permitting requires proof that injected fluids will remain confined within the target zone and not migrate into potable water sources.
Yes. The same principles used here apply to oilfield disposal wells, carbon capture storage, and other subsurface injection projects. Expertise in due diligence and subsurface engineering ensures safe and efficient operations across industries.
The approach used in this project extends beyond municipal wastewater disposal. The same combination of subsurface analysis, engineering design, and operational oversight is critical in projects requiring completion consulting, hydraulic fracturing consulting, and advanced oilfield data analytics.
Whether evaluating reservoir behavior, optimizing injection performance, or supporting regulatory approvals through due diligence, these capabilities help operators make informed decisions and avoid costly mistakes. In more complex scenarios such as disputes or regulatory challenges, the same technical foundation also supports expert witness services by providing defensible, data-driven insights.