Riverhead, NY · PFAS · forever chemicals
Is There PFAS in Riverhead Tap Water?
Riverhead, NY: PFOS 5.2 ng/L, 1.3× EPA's 4 ng/L limit. Every PFAS result and filter certifications per compound.
The measurements · EPA UCMR 5
4 of 29 PFAS detected
Each result is read against its own reference. Only PFOS and PFOA have federal limits. PFPeA has no federal or state limit and is shown for transparency, not graded.
- PFOSFederal MCLPerfluorooctanesulfonic acid5.2ng/LAbove its limit · sampled 2023-06-14 to 2024-01-17Evidence
- PFOAFederal MCLPerfluorooctanoic acid4ng/LDetected, below its limit · sampled 2023-06-14 to 2024-01-17Evidence
- PFHxAState MCL · MichiganPerfluorohexanoic acid3.3ng/LDetected, below its state limit · sampled 2023-06-14 to 2024-01-17Evidence
- PFPeANo limitPerfluoropentanoic acid3.2ng/L
No federal or state limit: shown for transparency, not graded.
Detected, no limit · sampled 2023-06-14 to 2024-01-17Evidence
All 29 compounds in this record
- PFOAMCL4 ng/L
- PFOSMCL5.2 ng/L
- PFHxSMCLNot detected
- PFNAMCLNot detected
- HFPO-DA (GenX)MCLNot detected
- PFHxA3.3 ng/L
- PFPeA3.2 ng/L
- 11Cl-PF3OUdSNot detected
- 4:2 FTSNot detected
- 6:2 FTSNot detected
- 8:2 FTSNot detected
- 9Cl-PF3ONSNot detected
- ADONANot detected
- NEtFOSAANot detected
- NFDHANot detected
- NMeFOSAANot detected
- PFBANot detected
- PFBSNot detected
- PFDANot detected
- PFDoANot detected
- PFEESANot detected
- PFHpANot detected
- PFHpSNot detected
- PFMBANot detected
- PFMPANot detected
- PFPeSNot detected
- PFTANot detected
- PFTrDANot detected
- PFUnANot detected
MCL marks the 5 PFAS given a federal limit in EPA's 2024 rule. EPA has proposed rescinding three of those limits; they apply until a final rule.
Results as a table29 results with limit, status, sample date and source
| Contaminant | Result | Limit | Status | Sampled | Source |
|---|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 5.2 ng/L | 4.0 ng/L federal MCL (2024) | Above a historical reference; current applicability unverified | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorooctanoic acid (PFOA) | 4 ng/L | 4.0 ng/L federal MCL (2024) | Within a historical reference; current applicability unverified | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |
| Perfluorohexanoic acid (PFHxA) | 3.3 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | Within a historical reference; current applicability unverified | 2023-06-14 to 2024-01-17 | UCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705) |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) |
| 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) |
| 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) |
How this compares
PFOS across 764 cities with a detected value
Riverhead 5.24 ng/L federal MCL (2024)
3,396 more were below the lab's 4 ng/L reporting limit and aren't plotted, and 34 have no result on record. 66 cities above 25 ng/L are grouped in the last bar. A position here is not a verdict on the water.
Where Riverhead sits5.2 ng/L PFOSLower than 74% of 764 cities with a detected value.
In New York
28of 145 city reports
have a regulated PFAS above the federal limit.
PFAS across New York →What this record covers
- RIVERHEAD WATER DISTRICT's water system as a whole, as reported to EPA UCMR 5.
- 29 PFAS compounds, each with its own result.
- Samples taken 2023-06-14 to 2024-05-03.
What is unknown
- The water at your tap. Building plumbing isn't in this record.
- PFAS not listed in the 29 above were not reported in these records.
- Levels since the last sample have not been published.
Treatment capabilities that apply
Test first, then match a certified method.
A tap test can confirm levels at your home before you choose treatment.
Identified concerns
- PFOS · exceeds the limit
- PFHxA · detected below the limit
- PFOA · detected below the limit
- PFPeA · detected, no federal or state limit
- Reverse osmosisOpen the method →
- Activated carbon (GAC)Open the method →
- Anion exchangeOpen the method →
9 products have a current certification naming a PFAS detected here.See PFAS filters, checked compound by compound ↓
Commercial · PFAS filters
Fit for Riverhead’s PFAS, compound by compound
Each filter is checked against the 4 PFAS detected here. A ✓ needs a current certification record that names the compound. A PFAS claim on the box is not enough.
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.
- ✓Certified for this compound
- ?Claimed or likely, not established
- –No claim on record
Under-Sink Filter
Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200)
Activated Carbon (Claryum)Detected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOS
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
Under-Sink Filter
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
Activated Carbon (Claryum)Detected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
Countertop System
Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)
Activated Carbon (Claryum)Detected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
Countertop System
Patriot Pure Ultimate Water Filtration System
Gravity pour-through (Nanomesh filter)Detected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOS
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
Countertop System
AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100)
Reverse OsmosisDetected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
Reverse OsmosisDetected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
Under-Sink Filter
Waterdrop G3P600 Tankless Reverse-Osmosis System
Reverse OsmosisDetected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 58NSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
Under-Sink Filter
Waterdrop G3P800 Tankless Reverse-Osmosis System
Reverse OsmosisDetected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 58NSF/ANSI 42
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
Refrigerator Filter
Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)
Activated CarbonDetected in Riverhead2 of 4 certified
- PFOS5.2 ng/L✓Certified for this compound
- PFHxA3.3 ng/L–No claim on record
- PFOA4 ng/L✓Certified for this compound
- PFPeA3.2 ng/L–No claim on record
CertifiedNSF/ANSI 53 · PFOA, PFOSNSF/ANSI 42NSF/ANSI 401
Certified for PFOS, PFOA; not established for PFHxA, PFPeA.
- Browse, not a match:
- Brita Elite Water Filter Pitcher
- Clearly Filtered Pitcher (lab-tested, not NSF 53 certified)
- Culligan ZeroWater 10-Cup Pitcher (ZEROP10)
- Frizzlife SP99 Under-Sink Filter
None of these is certified for all 4 compounds detected here. A tap test first tells you which ones reach your glass.
Questions
Frequently asked
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Is there PFAS in Riverhead tap water?
In EPA's UCMR 5 testing of RIVERHEAD WATER DISTRICT (2023-06-14 to 2024-01-17): PFHxA 3.3 ng/L (state limit 400,000), PFOA 4 ng/L (limit 4), PFOS 5.2 ng/L (limit 4), PFPeA 3.2 ng/L (no federal or state limit) and the other 25 PFAS tested not detected. "Not detected" means below the lab's reporting limit, not proven zero.
What are the federal PFAS limits?
EPA's 2024 drinking-water rule set maximum contaminant levels of 4.0 ng/L for PFOA and for PFOS, and 10 ng/L for PFHxS, PFNA and HFPO-DA (GenX). In May 2026 EPA proposed keeping the PFOA and PFOS limits, with the option of until 2031 to comply, and rescinding the other three. Until a final rule, all five limits apply. Results above them today are above the limits in force.
How do I remove PFAS from my tap water?
Reverse-osmosis systems and filters certified to NSF/ANSI 53 or 58 for PFOA/PFOS reduction are the proven options at the tap. Check the certifier's listing (NSF, WQA or IAPMO) for the exact model, and replace cartridges on schedule.
- UCMR5 Analytical ResultsUCMR5 Analytical Results: RIVERHEAD WATER DISTRICT (NY5103705)US EPA · 2026-01-15View source ↗
- State SDWIS Compliance RecordLead & Copper Rule 90th-percentile: RIVERHEAD WATER DISTRICT (NY5103705)US EPA SDWIS · 2026-07-09View source ↗
- State SDWIS Compliance RecordEPA SDWIS Violations & Enforcement: RIVERHEAD WATER DISTRICT (NY5103705)US EPA SDWIS · 2026-07-09View source ↗