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Distributed Wastewater Technology

This is not a new generation of advanced septic tanks. 

This is not a modern version of a 1970's era package plant.

This is the solution for nitrogen pollution from septic tanks and failing package plants.

This is Distributed Sewer, a revolutionary way to reach any home or business with sewer services, regardless of location.


Distributed Sewer uses state-of-the-art treatment technology in a continuously monitored, wireless control system, operated and maintained by wastewater professionals.

At the heart of an OnSyte DWTU is an advanced nutrient-removal wastewater treatment process, utilizing a suspended-growth, activated-sludge process in a miniaturized Sequencing Batch Reactor (SBR). Once treated, the clean water from the DWTU typically is directed to an existing drainfield. The OnSyte treatment method is essentially a scaled down version of the treatment technology commonly found in large wastewater treatment plants.

The OnSyte system provides high-efficiency treatment comparable to that performed at most municipal wastewater plants, but at a much smaller scale. With an OnSyte DWTS, there is no need for a wastewater collection system with its network of sewer laterals, mains, manholes, lift stations, and other infrastructure necessary to collect waste and transport it to a central wastewater treatment plant. Each OnSyte treatment system usually is installed in just one day, typically adjacent to the existing septic tank that will be decommissioned. Due to its virtual connection to the utility, an OnSyte unit can be deployed quickly, even at remote locations.

The OnSyte system represents a performance breakthrough for distributed treatment. In fact, the OnSyte system achieves total nitrogen reduction in excess of 80% and outstanding reductions in BOD, TSS, and coliform bacteria. The key to achieving advanced wastewater treatment at this small scale is the patented OnSyte Performance programmable logic controller (PLC), operating in a networked environment (commonly called the Internet of Things, or IOT). The network of OnSyte DWTUs is remotely monitored by a licensed wastewater operator who will optimize system performance and perform remote supervisory control if a unit is operating out of specification. For example, if an abnormality is detected, such as a plumbing failure within the home or equipment failure within the treatment unit, the homeowner can be contacted, or a technician dispatched to repair the unit. In most cases, OnSyte will be notified of a malfunction or abnormality before the homeowner may realize it is occurring. If the issue cannot be resolved remotely, Customer Support staff will notify the homeowner that a technician needs to access their system and set up an appropriate time that works best for the homeowner and gets the treatment unit back online in an expedited manner.

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Performance Dashboard and SCADA

An industry first, the OnSyte Performance Dashboard provides real-time access to the entire network of distributed treatment units and provides important information such as wastewater flows, system capacity, and nitrogen removal.

The OnSyte SCADA system provides remote, wireless access to the OnSyte treatment units and provides complete control by professional wastewater operators.

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Benefits of the Distributed Sewer Approach


Individual septic tanks (Onsite Sewage Treatment and Disposal Systems, defined in s. 381.0065, Florida Statutes), including advanced nutrient removal systems, are regulated by the Florida Department of Health (FDOH), which requires a separate permit for every unit installed. Using the DWTS approach, a single permit from the Florida Department of Environmental Protection (FDEP) for a Distributed Wastewater Treatment System can be obtained for an integrated system of wastewater treatment units over a large area.

Speed and Scale

 As opposed to homeowner-initiated retrofits, OnSyte DWTUs can be quickly deployed in integrated, networked systems of hundreds or even thousands of units. DWTS technology can quickly provide centralized wastewater treatment system efficiency to areas of your community that are currently out of reach of existing wastewater treatment plants.


The significance of nutrient pollution has been recognized as a threat to the environment. Moreover, failing septic tanks are public health hazards that need to be eliminated to address exposure to E. coli, Enterococci, and other pathogens.


With a professional system operator overseeing the operation and maintenance of the DWTS under a long-term service contract, stable, low-cost sewer rates can be established. The savings made possible through a large, regional contract are passed on to the utility, which in turn can pass on a modest wastewater service fee to its customers. This will improve acceptance with current septic tank users.


Compared to converting septic systems to centralized sewer systems, the installation of OnSyte DWTUs is minimally invasive and non-disruptive to a neighborhood or community. There are also no disruptions or negative financial burdens placed on non-participants. Additionally, there are significant quality of life and cost advantages associated with not having to retrofit an established neighborhood with new sewer mains, lift stations and lateral pipes. The virtual connection to OnSyte DWTUs means they can be installed on demand instead of street-by-street or neighborhood-by-neighborhood. With this approach, a retrofit program can be developed on a first-come, first-served basis using an incentive-based system or based on other community-established criteria.

Utility Benefits

A homeowner connected to an OnSyte DWTU does not impact the capacity of an existing wastewater treatment plant. Any reserve capacity of the central system can be preserved for future growth in the community and as a valuable buffer against sewage overflows associated with storms and floods. Additionally, avoiding the need for extending force mains and lift stations across the community saves money and energy.

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OnSyte Residential

A Distributed Wastewater Treatment Unit designed to optimally treat wastewater from a single residential home.

  • Full integration with the OnSyte SCADA

  • 80% Total Nitrogen Removal

  • C/BOD5 and TSS <10 mg/L

World-Class Performance for every home

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OnSyte Commercial

Modular Treatment Units to handle average daily flows of 1,000 - 5,000 gallons per day.

  • Full integration with the OnSyte SCADA

  • 80% Total Nitrogen Removal

  • C/BOD5 and TSS <10 mg/L

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Large Flow Treatment Units

Large Flow treatments units to handle small communities, office parks, green-field development or any other need.

  • Full integration with the OnSyte SCADA

  • 80% Total Nitrogen Removal

  • C/BOD5 and TSS <10 mg/L

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