Question 1

What is Perfluoroheptanoic Acid?

Accepted Answer

Perfluoroheptanoic Acid (PFHpA) is a per- and polyfluoroalkyl substance (PFAS) – a synthetic chemical used in manufacturing, firefighting foam, and consumer products. It persists indefinitely in water and the human body.

Question 2

Is PFHpA in my drinking water?

Accepted Answer

EPA UCMR5 testing (2023-2025) monitors PFHpA at 6,800+ US water systems. Enter your ZIP code at KnowYourExposure.com to see if PFHpA has been detected in your specific utility.

Question 3

What is the EPA limit for PFHpA?

Accepted Answer

The EPA drinking water limit for PFHpA is 10 parts per trillion (ppt). Utilities have until 2029 to reduce levels below this threshold under the 2024 PFAS Rule.

Question 4

What are the health effects of PFHpA?

Accepted Answer

PFHpA exposure has been linked to: Liver toxicity, Thyroid disruption, Developmental effects. Long-term exposure increases risks even at low doses.

Question 5

How do I remove PFHpA from my water?

Accepted Answer

Certified reverse osmosis systems remove 90%+ of most PFAS including PFHpA. Activated carbon and ion exchange filters also work. Boiling does NOT remove PFAS – it concentrates them.

Question 6

What is the CAS number for Perfluoroheptanoic Acid?

Accepted Answer

The CAS Registry Number for Perfluoroheptanoic Acid is 375-85-9.

PFHpA: Health Effects, EPA Limits & Sources (2026)