Understanding I/A Septic Systems on Long Island
What Is an I/A Septic System?
I/A stands for Innovative/Alternative. These advanced septic systems use additional treatment steps beyond a standard septic tank to produce cleaner effluent before it reaches the drain field. On Long Island, where groundwater protection is critical, I/A systems have become the standard for new installations and upgrades.
Why Long Island Requires Them
Suffolk County and parts of Nassau County now require nitrogen-reducing I/A systems for new construction and certain renovations. The goal is to reduce nitrogen contamination in local waterways and drinking water supplies, which has been a growing concern for decades.
How They Work
Most I/A systems add a treatment stage between the septic tank and the drain field. This extra step breaks down nitrogen compounds before the treated water is released into the soil. The result is significantly cleaner effluent compared to a conventional system.
What Homeowners Need to Know
I/A systems require regular maintenance and annual inspections to stay in compliance. Working with an experienced installer who understands local regulations is essential. At Chris Rehm Excavation, we handle everything from permitting to installation to ongoing maintenance.
