Hoot ANR System
Advanced Nitrogen Reduction
The highest-performing system in the Hoot line — the first treatment system tested and certified by NSF to exceed the EPA’s drinking water standard for nitrogen. Built for California’s most environmentally sensitive sites.
When Standard Treatment Isn’t Enough
Some sites demand more than the baseline. Properties near water supply wells, in nitrate-sensitive groundwater basins, or with minimal separation between the seasonal high water table and the proposed treatment area require a system that goes beyond what most aerobic units can deliver. The Hoot ANR (Advanced Nitrogen Reduction) system was engineered specifically for these conditions.
The ANR is the first wastewater treatment system of its kind to be tested and certified by NSF International to not only meet but exceed the EPA’s drinking water standard of 10 mg/L for total nitrogen. That’s a significant milestone — and it’s what makes the ANR the system of choice when county regulators or site conditions demand the highest available treatment level.
NSF certified to exceed EPA standards: The Hoot ANR is certified to achieve total nitrogen levels below the EPA’s 10 mg/L drinking water threshold — a level no conventional septic system comes close to reaching.
Certified Treatment Results
The Hoot ANR delivers exceptional treatment across all key performance metrics:
Dramatically reduces carbonaceous biological oxygen demand before effluent reaches dispersal.
Near-complete suspended solids removal producing clear, odorless treated effluent.
Outstanding nitrogen reduction — driving total nitrogen below the EPA’s 10 mg/L drinking water threshold.
Optional UV disinfection brings fecal coliform counts below 100 — meeting stringent reuse and discharge standards.
The ANR is available in 450 GPD, 675 GPD, and 900 GPD configurations to accommodate a range of residential and small commercial flow requirements.
The ANR Process
The Hoot ANR builds on the same proven aerobic treatment platform as the BNR system, then adds a patent-pending nitrogen reduction process that sets it apart from any other system on the market.
- Aerobic Treatment: Oxygen is introduced into the wastewater, activating bacteria that break down organic material rapidly and efficiently — the same foundation as the BNR system.
- Carbon-Based Dosing: A computer-controlled system adds a carbon-based food additive that promotes additional denitrification — converting nitrates into harmless nitrogen gas that off-gasses from the system.
- Proportional Dosing Control: The controller monitors actual system flow and doses proportionally based on need, rather than on a fixed schedule. This ensures consistent nitrogen reduction across varying usage levels and influent strengths from 35–75 mg/L TN.
- Optional UV Disinfection: For sites requiring the lowest possible pathogen levels, UV disinfection can be added to bring fecal coliform counts below 100 — supporting reuse applications and the strictest discharge requirements.
When to Choose the ANR Over the BNR
The ANR is the right choice when site conditions or county requirements demand the highest available level of nitrogen reduction. Common scenarios include:
Minimal Soil Separation
Sites with little or no organic soil contact between the treatment zone and seasonal high groundwater — where nitrogen leaching into the water table is a concern.
Nitrate-Sensitive Areas
Properties in groundwater basins where county or state agencies require advanced nitrogen reduction as a condition of permit approval.
Proximity to Water Supply Wells
Where the distance between the treatment system and a drinking water well requires the lowest achievable effluent nitrogen levels.
Reuse Applications
Properties using GeoFlow drip dispersal or other approved reuse methods where effluent quality standards are more stringent than standard discharge requirements.
Not sure whether your site needs the ANR or whether the standard Hoot BNR System would be sufficient? We can evaluate your site conditions, review your county’s LAMP requirements, and give you a clear recommendation. Call us at 916-436-8457.
Need the Highest Level of Nitrogen Reduction?
If your site or your county’s requirements call for advanced nitrogen treatment, the Hoot ANR is the system that delivers. Contact Superior On-Site Solutions to discuss your project and find out if the ANR is the right fit.