Roughly seven out of ten homes in Suffolk County are not connected to a sewer. They run on a cesspool or a septic system buried in the yard, most of them installed decades ago, most of them doing exactly what they were designed to do, which is get wastewater out of the house and into the ground.

The ground, in Suffolk, is also the drinking water. That is the entire problem in one sentence.

On Monday, August 3, County Executive Ed Romaine announced a new website and a streamlined application system for the county's Septic Improvement Grant Program. Eligible property owners can receive grants of up to $45,000 toward installing advanced wastewater treatment technology.

What the money is for

The grant covers an Innovative/Alternative onsite wastewater treatment system, universally shortened to I/A. It is a septic system with a treatment stage: instead of simply separating solids and letting the rest leach into the soil, an I/A system uses advanced treatment to cut the nitrogen in the discharge before it reaches the ground.

Nitrogen is the specific villain here, and it is worth understanding why a county would spend this much money on it.

According to county officials, nearly 70 percent of Suffolk homes use cesspools and septic systems, and those systems are a major source of nitrogen pollution affecting drinking water and fueling harmful algal blooms in the region's surface waters.

If you have followed the advisories on Suffolk's lakes and bays this summer, you have watched the downstream half of that sentence happen in real time. Nitrogen reaching a bay is fertilizer for algae. The blooms that follow can close a swimming beach, kill fish, and in some cases produce toxins dangerous to dogs and people.

"Outdated septic systems and cesspools have led to the degradation of our waters and are a serious threat to our region's groundwater and bays," Romaine said. "By making the Suffolk County Septic Improvement Grant Program application process easier, more homeowners will take advantage of this funding and be part of the solution for clean water."

The change is the paperwork, and that is not a small thing

The program is not new. The grants are not new. What changed this week is the process, and if that sounds minor, it is because most people have never tried to apply for two separate government grants for the same hole in their yard.

The $45,000 figure is a combination: a Suffolk County grant plus funding from the New York State Septic System Replacement Program. Until now, those were two tracks. The new portal walks a homeowner through eligibility, gives step-by-step application instructions, and provides a single, simpler way to submit the required documents for both.

The county's own framing is worth quoting on the design goal, because it names the real barrier: making the process easier means more homeowners will take advantage of the funding. Uptake, not money, has been the limiting factor. A program can be fully funded and still fail if the application is unpleasant enough that people give up halfway.

Where the county's share comes from

The county portion is funded by a voter-approved one-eighth cent sales tax, alongside the state's replacement program.

That detail matters for anyone weighing whether to bother applying. This is not discretionary money that appears in a good budget year and vanishes in a bad one. Suffolk voters approved a dedicated revenue stream for water quality, and this is one of the things it pays for. You have been contributing to it at the register.

Who should look at this

The obvious candidates are homeowners with a failing or outdated cesspool, and anyone facing a system replacement they were going to have to pay for regardless. If you are already looking at a five-figure bill, the calculation is not whether to spend the money. It is whether to spend it on a conventional replacement or take the grant and install treatment.

The less obvious candidates are homeowners near surface water: the bays, the creeks, the harbors and the ponds. Proximity to water is where an individual replacement has the most measurable effect, because nitrogen from a system close to a shoreline reaches that shoreline soonest.

There is also a straightforward property argument. Suffolk has been tightening wastewater requirements for years, and a house with a modern treatment system is a house that is not carrying a deferred, growing obligation into its next sale.

How to apply

The program lives at suffolkcountyny.gov/septicgrants, which is where eligibility information and the application both sit. Questions go to 631-852-5811 or [email protected].

Two practical notes. Have your property information and your existing system's details in hand before you start, because the fastest applications are the ones that do not stall waiting on a document. And talk to more than one installer. I/A systems are a specialized install and the market for them on Long Island has grown quickly, which means pricing and lead times vary.

The scale of what is left

It is worth ending on the arithmetic, because it puts a single grant in perspective.

Suffolk County has funded thousands of I/A installations since the program began. Against nearly 70 percent of the county's housing stock running on cesspools and septic systems, that is real progress and a long way from finished. Groundwater moves slowly, which cuts both ways: the pollution loaded into the aquifer over decades will take decades to work through, and the improvements made now will still be paying off long after the paperwork is forgotten.

Which is the argument for filling out the form. Not because one backyard changes a bay, but because the aquifer under Long Island is the only one there is, and every household sits on top of it.