North Fork · Jamesport
Jamesport NY private wells sit on the Riverhead Town edge
Jamesport is North Fork geography inside the Town of Riverhead. More wells than Nassau. Calverton is next door — do not copy that plant onto this kitchen. No water bill means a lab kit.
Updated 2026-09-11 · Pipedeck · Jamesport, NY
| Jamesport kitchen | Calverton plant | Typical Nassau tap | |
|---|---|---|---|
| What it is | North Fork lot, often a well | Named Navy/Grumman site | Public supply |
| First step | Mail-in lab kit if no bill | Stay on the Calverton page | Skip the well kit |
| Numbers you use | This tap's report | Site figures only | District tap class |
| This hop | Well kit | Not this URL | PFAS / dioxane guides |
North Fork edge of Riverhead Town, not a Nassau district block
Jamesport is a North Fork hamlet in the Town of Riverhead. It is not Southold. It is not a Hempstead water-district cartoon. Main Road, Sound Avenue, and the lanes down toward the Peconic sit on the same sole-source sand aquifer designated in 1978. Nassau and Suffolk have no backup drinking water. That is island geology. It is not a score for this kettle.
Suffolk's water plan still cites about 45,000 private wells, on the order of 200,000 people. That is a plan figure, not a door-to-door count of Jamesport, Aquebogue, or South Jamesport. Nassau has about 500 private wells in the whole county. Jamesport lives on the Suffolk side of that split. More wells than Nassau is the county fact. It is not a claim that every Jamesport lot skipped a main. Some kitchens already pay a Suffolk County Water Authority bill. Some still drink a private well. The hamlet name on the envelope does not settle the pipe.
The Town of Riverhead holds the fork, the old plant hamlet, and this North Fork edge. Those are different URLs. Riverhead is the town page. Calverton keeps the named site. This page is Jamesport. Mattituck sits past the town line in Southold and keeps its own 20-of-38 well sample. Do not paste that sample onto a Jamesport street. Do not paste a Levittown Cape onto a farm lane off Main Road. The house next door can pay a district while yours still draws from the yard.
Census yearly estimates put people 65 and older on Long Island at 324,616 in 1990 and 597,366 in 2025. Suffolk has 310,245 people 65 and older, about 20.1 percent of the county. That is island aging, not a reason to skip the tap. If someone still uses a high tub on a Jamesport ranch, grab bars belong on the aging page. This URL starts at the well because the North Fork still has them, and Nassau mostly does not. House prices on this island rose about four times since 1990. Pay rose about three. People stay. A weekend house can sit dark Monday through Thursday and still drink the well on Saturday. A dark weekday does not put a plant on the pipe.
Calverton is next door. Those site numbers are not this kitchen.
Calverton sits west and inland in the same town. The old Navy/Grumman plant is a named groundwater file. Those figures belong on the Calverton page. They are why a well on this map is worth a real lab kit instead of a supermarket jug. They are not a reading for a Jamesport kettle. Do not paste that plant onto Main Road. Do not paste it onto a Sound Avenue farmhouse. Do not paste it onto a bay-side lot in South Jamesport. Proximity is not a lab report.
Bethpage is Nassau, mostly public supply, and a different solvent story. Do not copy a Bethpage water bill onto a Jamesport well. Hempstead public wells showing 1,4-dioxane in 7 of 9 in the record we use are a public-supply story. They are not this North Fork lot. The island has 34 federal plus 449 state listed sites — 483 in all, not 500 Superfunds. Those listings sit on the same sand. They do not tell you whether this Jamesport kitchen is a well. The bill does. The cap does.
From 2016 through 2022, Suffolk sampled private wells. About 47 percent of those wells showed some PFAS. Two hundred two of them were over drinking-water standards. That is the wells they sampled. It is not a Jamesport-only census we are going to invent. New York limits two common PFAS — PFOA and PFOS — at 10 parts per trillion in drinking water. You will not taste that. You will not smell it. A clear glass on a North Fork table is not a test. If you drink the well, measure this kitchen.
Cleanup talk at a neighbor site does not name the glass you poured this morning. You do not have to track another hamlet's file to fill bottles here. You do have to fill bottles if this house drinks the well. The sand story lives on the aquifer page. This page stays on this address.
The bill and the cap settle this Jamesport kitchen
Walk the grass for a round cap, often close to the house. Listen for a pump and a pressure tank in the basement or a small well house. Then look at the mail. If a water-district bill never shows up, treat the kitchen as a well until a lab says otherwise. If you just got the keys, ask for the last water bill and walk the yard that week. Closing papers can name a well and still skip the two chemicals this kit is for. If you rent, ask who pays the water and whether there is a cap. Silence is still a well until a lab.
Some lots keep a well for the lawn after the kitchen connected. If coffee, cooking water, and the glasses on the table still come from that well, fill the bottles. If the kitchen already sits on a treated district line and the well only waters turf, skip the kit. Filter what you actually swallow. A neighbor's tap is not your pipe. Aquebogue is not this lot. South Jamesport is not this lot. The only bottles that name this tap are the bottles you fill here.
How to fill the bottles, why a hardware-store strip is not this kit, and why Suffolk's $100 county panel is a different product live on the Suffolk wells page. Use the cold kitchen tap you drink — not a dock hose off the Peconic, not an outdoor faucet — then stay here for the Jamesport fork: already on the main, or still a well on the Riverhead Town edge.
After the report: match the chemical, not the neighbor hamlet
If a water-district bill already arrives, skip this kit. Start with the tap guides for PFAS and 1,4-dioxane. Public water is treated. You may still want a filter that matches those chemicals. Look for NSF 53 or P473 on the box, or reverse osmosis under the sink. A fridge pitcher that only says it filters water is usually chlorine and taste. 1,4-dioxane needs reverse osmosis. A pitcher is a refund for that chemical. Do not paste a neighbor hamlet's plant file onto a Jamesport district tap either.
If the well report comes back high for PFAS, get a filter made for that chemical. After a high PFAS report, shop a unit that was tested for those compounds. Reverse osmosis also covers them. Test first if you drink a well. Buying the box first is how a pitcher ends up in the fridge and the well stays the well. If 1,4-dioxane is high, skip the jug. The shopping page for that box is the dioxane reverse-osmosis guide. Cartridges are a yearly cost after you install something that actually matches the report. That later bill lives on the replacements page, not here.
Nitrate in the Magothy aquifer rose more than 80 percent from 1987 to 2013. That is leftover plumbing on sand — septic tanks and cesspools — not a PFAS meter. About 26 percent of Suffolk homes are on a sewer. About 74 percent are not. The county still talks about 360,000 on-site systems. Nassau is about 85 percent sewered. Jamesport did not flip that county split. Unsewered is not the same as a private well. Plenty of lots pay a water-district bill and still send bathroom water into a tank. Plenty of lots run a well and a tank on the same sand. Those are two setups. A nitrate strip can be a later job. It is not a substitute for the kit this page is about if the kitchen still drinks a well.
Ticks in the same grass are a clothes job on the ticks page. Do not hang a well kit on a tick. Do not hang a filter on the hedge. Do not hang a Superfund headline on either job. The listed-site count is a different list. The useful first question in Jamesport is still whether this house swallows well water. If it does, measure it. If it does not, skip this kit and stay on the tap class. Calverton remains next door. Those site numbers remain not this kitchen.
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Common questions
Is Jamesport in the Town of Southold like Mattituck?
No. Jamesport is a North Fork hamlet in the Town of Riverhead. Mattituck sits in Southold Town and keeps its own well sample. The town line is not a water test.
Does every Jamesport house drink a private well?
No. Some kitchens already pay a water-district bill. Some still drink a well. Suffolk has far more private wells than Nassau, but the bill and a cap in the grass settle this lot, not the hamlet name.
Can I copy Calverton site numbers onto this Jamesport tap?
No. Calverton is next door in the same town. Those plant figures stay on the Calverton page. They are not a reading for Main Road, Sound Avenue, or a bay-side Jamesport kitchen.
Does Suffolk's $100 well test look for PFAS on a Jamesport well?
No. Call 631-852-5810 if you want that cheaper county check. It looks at different things. A mail-in lab kit is the one that looks for PFAS and 1,4-dioxane. This site is not that office.
Do I still order a well kit if I already pay a Jamesport water bill?
No. Skip the kit on a district bill. Match a PFAS filter or reverse osmosis to the tap. The well button on this page is only for a kitchen that still drinks a well.
What if a Jamesport well report comes back high?
Match the chemical to the tool. NSF 53 or P473, or reverse osmosis, for PFAS. Reverse osmosis for 1,4-dioxane. A fridge pitcher is not that filter. Test first, then buy.
Is this the Riverhead page?
No. Riverhead is the town and the fork. This URL is one hamlet on the North Fork edge of that town. Calverton keeps the named plant. Jamesport keeps the kitchen that still may be a well.
Suffolk County well-plan figure (~45,000) vs Nassau ~500 private wells; 2016–2022 Suffolk well sampling; Nassau ~85% sewered / Suffolk ~26% sewered; county well-test line 631-852-5810; New York drinking-water standards; Calverton site figures stay on /calverton/.