The EPA finalised the first ever national drinking water regulation for PFAS in April 2024. Utilities must monitor by 2027 and meet standards by 2029. This guide covers what the rule requires, how utilities are responding, and what consumers can do at home.
What PFAS actually are
Per and polyfluoroalkyl substances (PFAS) are a family of thousands of synthetic chemicals used since the 1940s in nonstick cookware, water repellent fabrics, food packaging, firefighting foam, and industrial processes. They are called "forever chemicals" because they do not break down in the environment.
The 2024 EPA final rule
| Contaminant | MCL |
|---|---|
| PFOA | 4 parts per trillion (ng/L) |
| PFOS | 4 parts per trillion (ng/L) |
| PFHxS | 10 parts per trillion |
| PFNA | 10 parts per trillion |
| HFPO-DA (GenX) | 10 parts per trillion |
| Hazard index for mixtures | 1 |
Compliance timeline: utilities must begin monitoring by 2027 and meet MCLs by 2029. See the EPA PFAS drinking water page.
Scale of the challenge
Where PFAS comes from
- Firefighting foam (AFFF) at airports and military sites.
- Manufacturing (semiconductor, metal plating, textile).
- Landfill leachate.
- Biosolids from wastewater treatment.
- Consumer product runoff (nonstick pans, packaging, treated clothing).
- Industrial discharges.
- Atmospheric deposition from producer sites.
Health concerns
Studies link PFAS exposure to cancer (kidney, testicular), liver damage, immune system effects, thyroid disease, and developmental effects. Long half life in the body. Continued research on additional PFAS species and health impacts.
Testing your water
Utility testing
Utilities will test under the new rule starting 2027. Some already test voluntarily. Results appear in Consumer Confidence Reports and utility websites.
Home testing
Certified laboratories offer PFAS testing for USD 300 to 700 per sample. Test kits from utilities may be free in some jurisdictions. Do it yourself kits available but variable quality.
Treatment technologies
| Technology | Effectiveness | Notes |
|---|---|---|
| Granular activated carbon (GAC) | Good for long chain PFAS | Widely deployed, media replacement needed |
| Ion exchange | Very effective | Higher capacity than GAC |
| Reverse osmosis | Very effective | Also removes short chain PFAS; higher energy |
| Advanced oxidation | Some effectiveness | Emerging technology |
Utility response
Utilities in high impact areas are already installing GAC or ion exchange treatment. Some litigating with manufacturers. Federal funds through Bipartisan Infrastructure Law support PFAS treatment. Timeline pressures and capital costs are significant.
Home filtration options
| Type | Effectiveness against PFAS |
|---|---|
| Reverse osmosis (under sink) | Excellent (NSF 58 or NSF 401) |
| Activated carbon block (whole house or POU) | Good if NSF 401 certified |
| Ion exchange (POU) | Good if PFAS certified |
| Simple carbon pitcher (Brita, PUR) | Limited, not certified |
| Water softeners | None |
| UV disinfection | None |
Wastewater side
PFAS also accumulates in wastewater biosolids, causing separate policy issues. See our companion article on sludge management. Multiple US states restricting land application of PFAS impacted biosolids.
Source control
EPA also regulating PFAS discharges from industrial sources under Clean Water Act. National PFAS Roadmap includes upstream source controls. This is the long term path to eventually reducing PFAS in source waters.
Litigation landscape
Multiple lawsuits against DuPont, 3M, Chemours, and others. Settlement funds already exceed USD 10 billion for treatment costs. Continued litigation likely.
Global context
EU has PFAS restrictions in food packaging and firefighting foam. Denmark, Sweden restrict some PFAS. EPA drinking water rule ahead of most global regulators. Some manufacturers voluntarily phasing out PFAS.
Where PFAS regulation is going
- Additional PFAS species regulated.
- Industrial discharge restrictions tightening.
- Biosolids restrictions expanding.
- Global harmonisation continuing.
- Alternative chemistry adoption in consumer products.
- Ongoing litigation shaping industry response.
Frequently asked questions
Is PFAS in my water?
Utility testing under new rule will confirm. Voluntary testing available now.
What are safe levels?
EPA sets 4 ppt for PFOA and PFOS. Below is compliant.
How dangerous is PFAS?
Long term health effects documented. Not immediately dangerous but cumulative exposure matters.
What treatment works?
GAC, ion exchange, or reverse osmosis. Utility scale or point of use.
Does my Brita pitcher work?
Not for PFAS. Need NSF certified filters.
Can I test my water?
Yes through certified labs USD 300 to 700 per sample.
When must utilities meet standards?
Monitoring by 2027, MCLs met by 2029.
Are there federal funds?
Yes through Bipartisan Infrastructure Law.
What about food packaging?
Consumer products phase out. EU restrictions ahead of US.
Where can I read more?
EPA PFAS drinking water page, state health departments.
Summary
The EPA 2024 PFAS drinking water rule sets 4 ppt MCLs for PFOA and PFOS with compliance required by 2029. Roughly 100 million Americans on affected water systems. Utilities investing in GAC, ion exchange, and RO treatment with federal support. Home filters (NSF 401 or NSF 58 certified) provide additional protection. Litigation against manufacturers funds cleanup. Long term source control through industrial regulation is the sustainable path.
Next reading
- How a water treatment plant works
- US water utilities explained
- Find your local water plant
- Browse the UtilityRadar directory
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