PFNA in Tap Water
PFNA is a longer-chain PFAS "forever chemical" regulated under the EPA PFAS rule both individually and as part of a combined hazard index with other PFAS.
Also known as forever chemical
Industrial and consumer-product manufacturing; highly persistent and bioaccumulative.
- 1Industrial discharge
- 2Legacy consumer-product manufacturing
Most affected: Infants, pregnant people, and immunocompromised individuals.
A result is read with its context
UCMR5 monitored a broad list of PFAS nationally, but PurityMap’s current dataset ingests per-system occurrence only for PFOA, PFOS, and PFHxS. PurityMap does not yet publish a per-system measured value for PFNA; this page is a reference explainer. To learn what is in your own water, check your utility’s Consumer Confidence Report (CCR) or use a certified home test.
- Above reference
- Evidence exceeds a reference level.
- Detected
- This substance was found in the monitoring record. Being present is not the same as being above a reference level, and this signal does not say which.
- Not detected
- Somebody looked and the laboratory reported nothing above its reporting limit. This is a result, and it is not the same as nobody looking.
- Not monitored
- No sampling for this substance has been reported for this system. Nothing is known either way, and an empty row is not a clean one.
10 cities above the federal limit, of 40 with a detection
- EmmausPA · 2024-08-01 to 2025-02-11 · EPA UCMR 599.8 ng/LAbove referenceView city →
- PflugervilleTX · 2025-03-17 to 2025-12-01 · EPA UCMR 525.2 ng/LAbove referenceView city →
- ManvilleTX · 2023-02-22 to 2023-11-20 · EPA UCMR 524.3 ng/LAbove referenceView city →
- QuakertownPA · 2025-02-12 to 2025-09-04 · EPA UCMR 524 ng/LAbove referenceView city →
- Manhasset Lakeville WdNY · 2025-02-12 to 2025-08-22 · EPA UCMR 519 ng/LAbove referenceView city →
- Emerald Coast (Ecua)FL · 2023-04-17 to 2024-09-04 · EPA UCMR 516.2 ng/LAbove referenceView city →
- West Deptford TwpNJ · 2024-12-11 to 2026-03-25 · EPA UCMR 516 ng/LAbove referenceView city →
- AmblerPA · 2024-08-19 to 2025-05-13 · EPA UCMR 513.5 ng/LAbove referenceView city →
- Drexel HillPA · 2024-02-01 to 2024-12-11 · EPA UCMR 512 ng/LAbove referenceView city →
- BrooksideDE · 2023-02-08 to 2023-12-11 · EPA UCMR 511.6 ng/LAbove referenceView city →
- WilliamsportPA · 2024-03-05 to 2024-12-10 · EPA UCMR 59.7 ng/LView city →
- Albertson WdNY · 2024-11-01 to 2025-05-22 · EPA UCMR 58.2 ng/LView city →
- Garden CityID · 2024-04-30 to 2024-10-14 · EPA UCMR 58.2 ng/LView city →
- Park RidgeNJ · 2023-03-21 to 2023-09-20 · EPA UCMR 58.1 ng/LView city →
- FresnoCA · 2023-03-01 to 2025-12-16 · EPA UCMR 58 ng/LView city →
- Mount PennPA · 2024-12-04 to 2025-07-15 · EPA UCMR 57.7 ng/LView city →
- Florence Twp WNJ · 2023-09-29 to 2024-03-26 · EPA UCMR 57.3 ng/LView city →
- Crestline Village CwdCA · 2024-01-08 to 2025-01-27 · EPA UCMR 57.1 ng/LView city →
- Garden City (V)NY · 2023-05-17 to 2026-06-17 · EPA UCMR 57.1 ng/LView city →
- ClovisCA · 2023-05-04 to 2024-05-16 · EPA UCMR 56.9 ng/LView city →
- LantanaFL · 2023-04-12 to 2024-04-23 · EPA UCMR 56.8 ng/LView city →
- St James DistrictNY · 2024-08-13 to 2025-02-03 · EPA UCMR 56.6 ng/LView city →
- MiamiFL · 2023-11-08 to 2024-05-15 · EPA UCMR 56.5 ng/LView city →
- CamdenNJ · 2024-06-26 to 2024-12-18 · EPA UCMR 56.2 ng/LView city →
Showing 24 of 40, highest first. Latest published value per city, from EPA UCMR 5. Only detections are listed; cities where it was not detected are not shown. A system-level result, not a measurement of any single home.
+3 more states.
What can carry a PFNA reduction claim
- Reverse osmosis
Semi-permeable membrane separation removing dissolved minerals, heavy metals, and persistent fluorinated chemicals down to 0.0001 microns.
- Activated carbon (GAC)
Highly porous adsorption media targeting chlorine, disinfection byproducts, volatile organic compounds, and organic chemicals.
- Anion exchange
Synthetic polyvalent resin beads that exchange unwanted dissolved ionic contaminants for harmless benchmark ions.
Boiling does not remove a dissolved chemical compound and can concentrate it. Many pitcher and refrigerator filters carry no verified claim for a compound like this at all.
A finding establishes the need, the need names the capability, the capability requires a verified certification. No product appears before that sequence completes. Filter Finder →
Frequently asked
Answers cite the same records as the page. How PurityMap analyzes water data
PFNA is a longer-chain PFAS "forever chemical" regulated under the EPA PFAS rule both individually and as part of a combined hazard index with other PFAS.
The enforceable federal limit is 10 ng/L (MCL); MCLG of 10 ng/L. EPA has proposed rescinding this limit; it applies until a final rule. PurityMap reads every measurement against its stated benchmark and never sets its own.
Industrial discharge, Legacy consumer-product manufacturing.
PFNA is associated in studies with immune, liver, and developmental effects. Like other PFAS it bioaccumulates, and it is regulated both on its own and as part of the combined hazard index.
Treatment technologies commonly certified to reduce PFNA include Reverse osmosis, Activated carbon (GAC), Anion exchange. Match the exact certified claim to your water before buying. Holding a format is not the same as holding the claim.
In PurityMap's published record, 40 cities have a published PFNA value from EPA UCMR 5 monitoring (detections), 10 of them above the federal limit. This is the scope of our record, not a national prevalence estimate.