The Suffolk County Department of Health Services has granted Residential General Use Approval to the Norweco Hydro-Kinetic series Innovative and Alternative Onsite Wastewater Treatment System.
The Norweco Hydro-Kinetic Suffolk County approval was issued on July 16, 2026, and became effective on June 25, 2026. It followed a detailed residential performance review involving 20 systems and 24 months of bimonthly sampling.
This approval marks an important advancement for onsite wastewater treatment in Suffolk County. It gives homeowners, engineers, and wastewater professionals another approved option for residential nitrogen treatment.
Suffolk County Grants Residential General Use Approval
The Suffolk County Department of Health Services issued the approval under Article 19, which establishes standards for Innovative and Alternative Onsite Wastewater Treatment Systems.
The Hydro-Kinetic series successfully completed Suffolk County’s Provisional Use Approval phase. Based on the submitted performance data, the county advanced the I/A OWTS technology to Residential General Use status.
Approval at a Glance
Approval detail | Official result |
Approval level | Residential General Use |
Effective date | June 25, 2026 |
Certification letter date | July 16, 2026 |
Residential systems evaluated | 20 |
Evaluation period | 24 months |
Sampling frequency | Every two months |
Average total nitrogen result | 12.4 mg/L |
General Use performance limit | 19 mg/L TN or less |
The approval adds the Hydro-Kinetic series to the available options for Suffolk County approved septic systems intended for residential use.
View the Official Suffolk County Approval Certificate
Suffolk County issued the following certification letter for the Norweco Hydro-Kinetic series. The document confirms the approval status, performance results, and ongoing sampling requirements.
What Is the Norweco Hydro-Kinetic System?
The Norweco Hydro-Kinetic septic system is an advanced wastewater treatment system designed to treat household wastewater more thoroughly than a conventional septic system.
A traditional septic system mainly separates solids before wastewater moves into the soil. An innovative and alternative onsite wastewater treatment system adds controlled biological and filtration processes to improve the quality of treated wastewater.
The Hydro-Kinetic treatment process includes:
- Pretreatment
- Aeration
- Anoxic treatment
- Clarification
- Wastewater recirculation
- Additional filtration
These stages support nitrogen-reducing wastewater treatment through extended aeration, attached growth, nitrification, and denitrification.
Homeowners and wastewater professionals can learn more about available Norweco Hydro-Kinetic systems, including how the technology treats residential wastewater.
For properties outside public sewer districts, this type of Long Island septic system can provide a more advanced approach to wastewater management.
Performance Results Behind the Approval
The Residential General Use Approval was based on field performance data from 20 systems installed at year-round residences.
Each system was sampled every two months for 24 months. Together, the systems achieved an average total nitrogen concentration of 12.4 milligrams per liter.
One of the 20 systems was located outside Suffolk County. Its performance results were accepted under the data-sharing provisions included in Article 19.
Performance Summary
- 20 residential systems evaluated
- 24 months of performance monitoring
- Sampling completed every two months
- 12.4 mg/L average total nitrogen
- 19 mg/L TN maximum rolling-average requirement
These results demonstrate the system’s ability to provide Total Nitrogen reduction under real residential conditions. This is especially important on Long Island, where nitrogen from traditional wastewater systems can enter groundwater and nearby surface waters.
Homeowners interested in this type of technology can also explore Norweco’s nitrogen reducing septic systems for more information about advanced treatment options.
A Major Milestone for Advanced Wastewater Treatment in Suffolk County
The Norweco Hydro-Kinetic Suffolk County approval is a major milestone for advanced residential wastewater treatment on Long Island.
With an average total nitrogen result of 12.4 mg/L across the approval dataset, the Hydro-Kinetic series successfully completed the required residential evaluation and received Residential General Use status.
For homeowners comparing advanced septic systems on Long Island, the next step is a property-specific evaluation. Norweco of New York can help explain system options, design requirements, installation planning, available funding, and ongoing service needs.
Contact Norweco of New York to discuss whether a Hydro-Kinetic system may be suitable for your Suffolk County property.
Frequently Asked Questions
It means the Hydro-Kinetic series has completed Suffolk County’s residential testing requirements and can be considered for qualifying residential projects.
Homeowners now have another approved nitrogen-reducing system option for residential septic upgrades, subject to site-specific approval.
Systems must be sampled at least every 36 months and maintain a 12-month rolling average of no more than 19 mg/L total nitrogen.
No. The certification applies only to Residential General Use and does not include commercial projects.