Is Your Long Island Septic System Failing the Environment? Here’s What Modern Alternatives Can Do

Long Island homeowners face a unique challenge that many don’t fully understand: conventional septic systems and cesspools are considered failing by the New York State Department of Environmental Conservation since they are neither designed, nor capable of removing significant amounts of nitrogen. This isn’t just an environmental concern—it’s becoming a regulatory and financial reality that property owners can no longer ignore.

The Hidden Environmental Impact of Traditional Systems

Long Island has long been a disorganized mishmash of cesspools, septic tanks and sewage systems with varying degrees of impact on local ecosystems and groundwater. Nearly 90% of Nassau County is connected to sewage systems, compared to roughly a quarter of Suffolk. This disparity has created significant environmental consequences.

Traditional Long Island cesspools and septic systems are not designed to keep reactive nitrogen from entering groundwater aquifers. As waste water flows through the ground, the nitrogen from urine and other wastewater content is typically converted to nitrate, which is reactive. Nitrate travels through the ground water until it eventually flows to surface waters or drinking water wells.

The impact is severe: nitrogen excesses stemming from cesspool and septic tank leakage have profoundly impacted the Long Island Sound and the region’s drinking water. Nitrogen buildups have polluted drinking water sources and have contributed to hypoxic areas in the Sound. These are areas of low dissolved oxygen concentrations stemming from excessive amounts of nutrients, like nitrogen, causing abnormal and dense plant growth. This process disrupts marine wildlife, wrecking food chains as fish clear the area and more immobile organisms, like crabs and starfish, are left to suffocate, effectively creating dead zones.

Modern Alternative Systems: The Solution Long Island Needs

Long Island and specifically Suffolk County have been urging the adoption of I/A-OWTS technology to replace traditional septic systems. These Innovative and Alternative Onsite Waste Treatment Systems (I/A-OWTS) represent a revolutionary approach to wastewater management.

The approved nitrogen-reducing technologies use filtration and biological processes to ultimately convert the organic nitrogen found in wastewater into harmless nitrogen gas. This is commonly achieved by using separate compartments in the septic tank. The first compartment is typically anoxic, meaning there is no oxygen present in the wastewater. This compartment also contains human waste which is a good source of carbon to feed the “good” bacteria that denitrify or convert nitrate nitrogen to harmless nitrogen gas. The second compartment usually introduces oxygen through filters, blowers, or aerators to convert the ammonium in wastewater to nitrate nitrogen.

The results are impressive: provisional sampling data shows that both technologies reduce Total Nitrogen (TN) levels far below the 19 mg/L Suffolk County Standard. This is a significant improvement over the 65 mg/L conventional septic system effluent average total nitrogen of 65 mg/L. That is more than an 80% reduction in total nitrogen! IA OWTS systems have been shown to remove up to 90% of the nitrogen that leads to these problems.

Types of Modern Alternative Systems

Aerobic Treatment Units (ATUs): Aerobic Treatment Units use many of the same processes as a municipal sewage plant, but on a smaller scale. An aerobic system injects oxygen into the treatment tank. The additional oxygen increases natural bacterial activity within the system that then provides additional treatment for nutrients in the effluent.

Sand Filter Systems: Sand filter systems can be constructed above or below ground. Effluent flows from the septic tank to a pump chamber. It is then pumped to the sand filter. The sand filter is often PVC-lined or a concrete box filled with a sand material.

Constructed Wetlands: A constructed wetland mimics the treatment processes that occur in natural wetlands. Wastewater flows from the septic tank and enters the wetland cell. The wastewater then passes through the media and is treated by microbes, plants, and other media that remove pathogens and nutrients.

Mound Systems: Mound systems are an option in areas of shallow soil depth, high groundwater, or shallow bedrock. The constructed sand mound contains a drainfield trench. Effluent from the septic tank flows to a pump chamber where it is pumped to the mound in prescribed doses. Treatment of the effluent occurs as it discharges to the trench and filters through the sand, and then disperses into the native soil.

Financial Incentives Make Upgrades Affordable

The good news for Long Island homeowners is that substantial financial assistance is available. Nassau County Septic Environmental Program to Improve Cleanliness provides grant funding of up to $20,000 to repair and replace failing septic systems with nitrogen-reducing system. Nassau County uses $10,000 of federal funds from the American Recovery Plan Act in conjunction with $10,000 from State Septic System Replacement Grant funds.

In Suffolk County, the Suffolk County Septic Improvement Program provides up to $10,000 base grant. There is also up to an additional $10,000 that can be awarded to a grantee that installs a pressurized shallow drain field leaching system ($5,000) and/or toward the unit installation for low to moderate incomes eligible applicants ($5,000).

Suffolk County’s strict 2025 mandate requires all new installations and major replacements to include nitrogen-reducing technology. While their upfront costs range from 15,000–25,000, Suffolk’s septic improvement program rebates of up to $30,000 can cover most—or even all—expenses.

Why Choose Professional Installation

When considering a Septic Tank Replacement Long Island, NY, working with experienced professionals is crucial. Antorino & Sons is a family-owned and operated cesspool company serving Long Island. They’re not just about fixing cesspools; they’re about building relationships with customers and providing solutions that last. They understand the unique challenges of Long Island’s soil and water table.

With over 60 years of quality experience and satisfied customers, Antorino & Sons is a team you can trust. They understand Long Island’s unique soil and water conditions, ensuring septic systems are tailored for optimal performance and longevity, using only the best materials to guarantee durable and efficient septic solutions.

The Cost Reality of Septic System Replacement

Understanding the investment involved is essential for planning. Septic tank replacement costs $3,500 to $8,500 on average for a 3- or 4-bedroom home. Final costs depend on the tank size, material, and amount of gravel or fill dirt needed to set the tank. However, replacing a septic system is often more expensive than installing a brand new one. Replacing a septic system usually involves removing existing material as well as installing new parts. This involves more time and more labor.

For modern alternative systems, costs are higher but grants significantly offset expenses. Mound septic systems cost $10,000 to $20,000 to install. They pump wastewater from the tank into a sand mound, which is built over top of the septic system area. The sand filters the water before it goes into the soil and groundwater. These systems are expensive, but they’re necessary in areas with a high water table.

Making the Right Choice for Your Property

Just because conventional septic systems are common doesn’t mean they work for every property. There are many reasons why the standard model for wastewater sanitation doesn’t always cut it. For example, some plots of land have bedrock too close to the surface of the earth, which makes it impossible to dig deep enough to install a septic tank. Plenty of residents in the U.S. also live near bodies of water that are especially sensitive to water pollution, which means that the standard method of sanitation in septic tanks isn’t sufficient to maintain the area’s ecosystem.

The transition to modern alternative systems isn’t just about regulatory compliance—it’s about protecting Long Island’s precious water resources for future generations. Too much nitrogen can lead to algae blooms (some of which are toxic to humans) which, when these blooms die off, can deplete the bay of oxygen needed by fish and other marine life. In addition, excess nitrogen can lead to the loss of wetland marshes as their roots become too shallow to withstand storms and other disturbance. Since these wetlands protect Long Island’s shorelines from storms, serve as a natural filter for stormwater, and provide habitat for marine life, their destruction can cause significant negative impacts.

With substantial grant funding available and experienced professionals like Antorino & Sons ready to help, there’s never been a better time to upgrade from a failing traditional system to a modern alternative that protects both your property and Long Island’s environment.