Nitrate contamination is a pressing challenge for drinking water systems across the U.S. An April 2026 report from the Environmental Working Group found that about one-fifth of the U.S. population drinks water with nitrate concentrations exceeding recommended health guidelines. The U.S. EPA has established a maximum contaminant level of 10 mg/L for nitrate, a threshold that many groundwater systems struggle to meet.
Although nitrates occur naturally in soil, water, and air, elevated concentrations in drinking water sources are largely driven by human activity, particularly agricultural practices. Fertilizers, livestock manure, and runoff transport nitrogen compounds into groundwater, rivers, and reservoirs. The presence of nitrates in drinking water has been linked to a range of health concerns, including cancer in adults and adverse effects on infant health (e.g., blue baby syndrome).
Nitrate Removal Treatment Options
To address nitrate contamination, water utilities have traditionally relied on treatment technologies including reverse osmosis (RO) and ion exchange (IX). While these solutions are effective at removing nitrates, they present significant operational and environmental challenges, including high energy demand, system complexity, and the generation of concentrated brine that requires careful management and safe disposal.
Both RO and IX generate concentrated waste streams containing high levels of nitrates and other contaminants that must be managed, treated, or disposed of. This creates several issues, including increased operational costs, additional infrastructure requirements, and environmental concerns related to disposal. In many cases, these systems do not eliminate the problem entirely — they simply transfer it to another stage of the process.
So, how can nitrates be removed without creating new problems? An alternative approach is biological denitrification.
Biological denitrification is an efficient and safe method for treating drinking water, addressing nitrate contamination and the waste-management challenges associated with RO or IX nitrate-removal systems. Instead of separating nitrate from water, as RO and IX do, biological denitrification replicates natural environmental processes to safely transform nitrate into nitrogen gas, avoiding the production of hazardous waste and minimizing environmental impact.
BIOBOX® Nitrate delivers effective nitrate removal.
Advanced Biological Denitrification with BIOBOX Nitrate
The BIOBOX® Nitrate system, manufactured by BIOBOX Water from Zaragoza, Spain, and represented by AMS in the U.S., is a proprietary biological denitrification system delivered in either a containerized or full-scale configuration for drinking water applications. BIOBOX Nitrate uses NSF 60/61 Standard approved biomaterial (certified Food Grade, Group 1).
Key benefits of BIOBOX Nitrate include:
- Over 95% nitrate removal without brine waste
- Low water consumption (3–5%)
- Lower energy consumption compared to RO and IX
- Lower CAPEX and OPEX compared to RO and IX
- Treated water TOC below 2 ppm
- Turbidity under 0.3 NTU
BIOBOX Nitrate uses a proprietary process to ensure an anoxic environment, ideal for the growth of denitrifying bacteria, enabling stable biological activity and maintaining a consistent biofilm. Thanks to this optimized design, nitrate reduction to nitrogen gas occurs in a single step with minimized contact time—even at high nitrate concentrations.
The technology also features online remote condition monitoring, providing real-time health data for the onboard water-quality instruments. BIOBOX Nitrate is the only biological denitrification technology that combines fully automated control with continuous monitoring. This unique approach allows for remote process control and optimization and supports consistent system performance. It is also key to how BIOBOX replicates the natural process, but in an automated and intensified way.
As nitrate contamination persists across many regions in the U.S., especially agriculturally intensive areas, utilities are increasingly evaluating treatment approaches that meet regulatory limits and reduce long-term operation and environmental burdens.
Open House Event in June 2024 Provided Participants with an Inside Look at the Live Demonstration of the BIOBOX® Nitrate Biological Denitrification System at the Town of Gilbert.
Demonstrated Results
The Town of Gilbert, Arizona, hosted the first U.S. demonstration of the BIOBOX Nitrate system in 2024 to address elevated nitrate levels at a remote well site where blending was not an option.
The system achieved:
- Nitrate reduction from 26 ppm to non-detect levels
- Turbidity reduction to <0.3 NTU
- No detectable microbiological presence in treated water
- Regulatory approval from Maricopa County Environmental Services Department (Approval of Proposed Plan, Permit Application #2023070)
This demonstration validates BIOBOX Nitrate as a practical, energy-efficient alternative to conventional treatment technologies — without the burden of waste stream management.
Denitrification for Nitrate Contamination in Drinking Water
Traditional technologies like RO and IX remain effective, but their reliance on concentrate disposal presents ongoing challenges. BIOBOX Nitrate offers a space-saving, energy-efficient, and sustainable biological denitrification solution for water utilities seeking to avoid the cost and complexity of brine management. For communities with rising nitrate levels and limited disposal options, biological treatment, and BIOBOX Nitrate, offer a practical, sustainable alternative for nitrate management.
