PFOS
1.3× the limitPerfluorooctanesulfonic acid
5.2ng/L
Each block = 4.0 ng/L federal MCL (2024)
EPA UCMR 5 · sampled 2023Evidence
City water report · 2026
Is Riverhead Tap Water Safe? 2026 Water Quality Report
Short answer: PFOS is above its federal limit (a 2024 limit that water systems have until at least 2029 to meet); a past health-based violation (Nitrite) is on record. Riverhead Water District serves 35,000 residents.
Likely match, check your bill
RIVERHEAD WATER DISTRICT serves Riverhead
Your water bill or annual water quality report names your actual supplier.
- Source
- Groundwater
- Lead service lines
- 0 lead, 3,253 unknown
- RIVERHEAD WATER DISTRICTThis reportNY5103705 · 35,000 served
What stands out
One PFAS above the 2024 federal limit
The bar is drawn in blocks of the 4.0 ng/L federal MCL (2024), so the length shows how far above it the result sits.
Coverage by group
32 results on record- PFAS (forever chemicals)1 above · 3 detected · 25 not detected
- Metals & lead1 detected
- Disinfection by-productsNot monitored
- Other1 above · 1 not detected
Every detected result
6 detected results, by distance from their limit
RIVERHEAD WATER DISTRICT (EPA PWSID NY5103705) delivers groundwater to 35,000 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
- NitriteEPA SDWIS violations · 20231 mg/L2MG/LAbove limit
- Perfluorooctanesulfonic acid (PFOS)EPA UCMR 5 · 20234.0 ng/L federal MCL (2024)5.2ng/LAbove limit
- Perfluorooctanoic acid (PFOA)EPA UCMR 5 · 20234.0 ng/L federal MCL (2024)4ng/LWithin reference
- Lead (90th percentile)EPA SDWIS (Lead & Copper Rule) · 202515 µg/L federal action level2µg/LWithin reference
- Perfluorohexanoic acid (PFHxA)EPA UCMR 5 · 2023400,000 ng/L Michigan EGLE state MCL (strictest US state)3.3ng/LWithin reference
- Perfluoropentanoic acid (PFPeA)EPA UCMR 5 · 2023No federal or state limit; shown for transparency3.2ng/LDetected · no limit
26 other contaminants tested, none detected
- 11Cl-PF3OUdS
- 4:2 FTS
- 6:2 FTS
- 8:2 FTS
- 9Cl-PF3ONS
- ADONA
- HFPO-DA (GenX)
- NEtFOSAA
- NFDHA
- NMeFOSAA
- PFBA
- PFBS
- PFDA
- PFDoA
- PFEESA
- PFHpA
- PFHpS
- PFHxS
- PFMBA
- PFMPA
- PFNA
- PFPeS
- PFTA
- PFTrDA
- PFUnA
- Lithium
Track record
1health-based violation in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
Not in this recordDisinfection by-products weren't monitored in this dataset
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
Health-based violations, last 10 years
Every filing is listed; the Track record score counts at most one per contaminant per year.
- Nitrite
Resolved
- NitriteMCL
to Resolved
What you can do
Test first, then treat what was found
- 01 · TestTest your own tap
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
Certified labHow to test your tap → - 02 · Treat PFASReverse osmosis, or carbon certified for PFAS
PFOS 5.2 ng/L, above the 4 ng/L limit (+3 more PFAS detected)
NSF/ANSI 58 or 53, with PFOS/PFHxA/PFOA/PFPeA named on the listingTreatment for PFAS → - 03 · LeadLead-certified carbon filter, or reverse osmosis
lead 2 µg/L, below the 15 µg/L action level
NSF/ANSI 53 (lead)Treatment for Lead →
Test your own tap
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Screening: quick check, not lab-grade
Safe Home DIY Lead in Drinking Water Combo Test Kit
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
- Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Labs Basic Water Quality Test Kit
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
- Analyzed by Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638
- Turnaround: 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
When your results arrive, read them here →
Commercial
Certified for a concern found here
Each card names which Riverhead findings its current certification covers, and which it doesn't.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
Under-Sink Filter
Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200)
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Under-Sink Filter
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
See all 13 products certified for a Riverhead concern →
Countertop System
Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Countertop System
Patriot Pure Ultimate Water Filtration System
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Countertop System
AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100)
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Under-Sink Filter
Waterdrop G3P600 Tankless Reverse-Osmosis System
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Under-Sink Filter
Waterdrop G3P800 Tankless Reverse-Osmosis System
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Refrigerator Filter
Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)
- PFOS: eligible, evidence match
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Water Pitcher
Brita Elite Water Filter Pitcher
- Lead: eligible, evidence match
- Not established: PFOS, Perfluorohexanoic acid (PFHxA), PFOA and 1 more
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Water Pitcher
Culligan ZeroWater 10-Cup Pitcher (ZEROP10)
- Lead: eligible, evidence match
- Not established: PFOS, Perfluorohexanoic acid (PFHxA), PFOA and 1 more
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Faucet Attachment
PUR Plus Faucet Filter (FM2500V)
- Lead: eligible, evidence match
- Not established: PFOS, Perfluorohexanoic acid (PFHxA), PFOA and 1 more
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Under-Sink Filter
Frizzlife SP99 Under-Sink Filter
- Lead: eligible, evidence match
- Not established: PFOS, Perfluorohexanoic acid (PFHxA), PFOA and 1 more
Not suitable for (4)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
Questions
Frequently asked questions
Is Riverhead tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Riverhead, PFOS 5.2 ng/L was measured above the 4 ng/L federal limit in EPA's 2024 testing; the lead 90th-percentile result was 2 µg/L against the 15 µg/L action level; one health-based violation is on record (Nitrite). RIVERHEAD WATER DISTRICT (PWSID NY5103705) has a Purity Score of 67/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
Who provides tap water in Riverhead?
RIVERHEAD WATER DISTRICT (PWS ID NY5103705) is the public water system on record for Riverhead, New York, serving about 35,000 people. Confirm the utility on your water bill before acting on a specific finding.
Where does Riverhead get its drinking water?
Groundwater (primary source of record in EPA SDWIS).
Are PFAS "forever chemicals" in Riverhead's water?
Yes. In EPA's UCMR 5 testing (2023-06-14 to 2024-01-17), PFOS was measured at 5.2 ng/L against a 4 ng/L federal limit. PFHxA (3.3 ng/L, below the 400,000 ng/L state limit) and PFOA (4 ng/L, below the 4 ng/L federal limit) were also detected. PFPeA (3.2 ng/L) was also detected; it has no federal or state limit. Reverse osmosis and filters certified to NSF/ANSI 53 for PFOA/PFOS reduce them at the tap.
Is there lead in Riverhead's tap water?
RIVERHEAD WATER DISTRICT's most recent lead 90th-percentile result (2025–2027) was 2 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Has Riverhead's water system had violations?
The federal SDWIS record lists a health-based violation for RIVERHEAD WATER DISTRICT within about the last ten years: Nitrite (2023). The findings above show each one's status.
What does the latest Riverhead water report show?
PurityMap's current record for Riverhead holds 32 findings: 2 above a reference, 3 detected within the reference, 1 detected with no limit and 26 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
Follow this water
Follow Riverhead's water
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.
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Sources and dataAll 32 records and their sourcesEPA UCMR 5 · EPA SDWIS (Lead & Copper Rule) · EPA SDWIS violations
| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| Nitrite | 2 MG/L | 1 mg/L | Above the listed reference | 2023 | EPA SDWIS Violations & Enforcement: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorooctanesulfonic acid (PFOS) | 5.2 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorooctanoic acid (PFOA) | 4 ng/L | 4.0 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Lead (90th percentile) | 2 µg/L | 15 µg/L federal action level | Below the listed reference | 2025–2027 monitoring period (still open) | Lead & Copper Rule 90th-percentile: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorohexanoic acid (PFHxA) | 3.3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluoropentanoic acid (PFPeA) | 3.2 ng/L | No federal or state limit; shown for transparency | Detected, no limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
26 other contaminants tested — none detected
| Contaminant | Result | Benchmark | Status | Sampled | Source |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-05-03 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-05-03 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-05-03 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-05-03 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | Not detected above the reporting limit | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
- Result
- 2 MG/L
- Benchmark
- 1 mg/L
- Status
- Above the listed reference
- Sampled
- 2023
Perfluorooctanesulfonic acid (PFOS)
- Result
- 5.2 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Status
- Above a historical reference; current applicability unverified
- Sampled
- 2023-06-14 to 2024-01-17
- Result
- 4 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Status
- Within a historical reference; current applicability unverified
- Sampled
- 2023-06-14 to 2024-01-17
- Result
- 2 µg/L
- Benchmark
- 15 µg/L federal action level
- Status
- Below the listed reference
- Sampled
- 2025–2027 monitoring period (still open)
Perfluorohexanoic acid (PFHxA)
- Result
- 3.3 ng/L
- Benchmark
- 400,000 ng/L Michigan EGLE state MCL (strictest US state)
- Status
- Within a historical reference; current applicability unverified
- Sampled
- 2023-06-14 to 2024-01-17
Perfluoropentanoic acid (PFPeA)
- Result
- 3.2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Detected, no limit
- Sampled
- 2023-06-14 to 2024-01-17
26 other contaminants tested — none detected
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Result
- < 5 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
- Result
- < 9 µg/L
- Benchmark
- 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-05-03
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Result
- < 6 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-05-03
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Result
- < 20 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluoro-3-methoxypropanoic acid (PFMPA)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluoro-4-methoxybutanoic acid (PFMBA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluorobutanesulfonic acid (PFBS)
- Result
- < 3 ng/L
- Benchmark
- 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluorododecanoic acid (PFDoA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluoroheptanesulfonic acid (PFHpS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluoroheptanoic acid (PFHpA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluorohexanesulfonic acid (PFHxS)
- Result
- < 3 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
- Result
- < 4 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluoropentanesulfonic acid (PFPeS)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Perfluorotetradecanoic acid (PFTA)
- Result
- < 8 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-05-03
Perfluorotridecanoic acid (PFTrDA)
- Result
- < 7 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-05-03
Perfluoroundecanoic acid (PFUnA)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Status
- Not detected above the reporting limit
- Sampled
- 2023-06-14 to 2024-01-17
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: RIVERHEAD WATER DISTRICT (NY5103705)
US EPA SDWIS
State SDWIS Compliance Record
EPA SDWIS Violations & Enforcement: RIVERHEAD WATER DISTRICT (NY5103705)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Something off with your water's smell, color or taste?
Start with the hot-or-cold tap check. Where Riverhead Water District reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at Riverhead Water District: 2 µg/L (90th percentile, 2025–2027 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.
ZIP codes in Riverhead
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.