PFAS and Powder Coating Wash Water: What EPA's 2027 Proposal Means

2 days ago

4 min read

EPA's PFAS proposal for the metal finishing category, now expected in February 2027, is aimed at chrome finishing shops that use PFAS to control hexavalent chromium, not at the iron phosphate or zirconium pretreatment ahead of a powder line. Phosphating is still a covered Metal Finishing operation, though, and sewer authorities are already asking industrial users about PFAS. A closed-loop pretreatment line with no process discharge keeps your wash water out of that conversation.

Here's what EPA has actually said, which shops the rule targets, and what a powder coater or fabricator can do now instead of waiting for the proposal.

What is EPA proposing, and when?

EPA announced a rulemaking to address PFAS discharges from metal finishing and electroplating facilities in its Preliminary Effluent Guidelines Program Plan 15 in September 2021. The rule would add PFAS requirements to the existing federal effluent guidelines for these categories.

The date has moved more than once. EPA's December 2024 plan targeted spring 2026, that slipped to July 2026, and the July 2026 Unified Agenda now lists February 2027 as the expected proposal date. A summary of the agenda notes the action is still pre-proposal while EPA reviews data from its Multi-Industry PFAS Study.

A proposal is not a final rule. After it's published there will be a comment period, and any compliance dates will be set in the final rule.

Which shops is the rule aimed at?

EPA's metal finishing page names chrome finishing facilities as the main PFAS dischargers in these categories, because some of them use PFAS to control hexavalent chromium emissions. Here's how common operations line up against what EPA has said so far.

Operation	Named by EPA as a main PFAS source?	What to watch
Chromium plating, chromium anodizing, chromic acid etching	Yes	The core target of the 2027 proposal
Chromate conversion coating	Yes	Covered in EPA's chrome finishing group
Iron phosphate pretreatment	No	Still a Metal Finishing "coating" operation under Part 433
Zirconium pretreatment	No	Watch the proposal for scope language
Alkaline cleaning ahead of powder	No	Local permit questions, not the federal PFAS rule

The table reflects EPA's own description of the rulemaking. It doesn't mean every product in every line is PFAS-free; that's a question for your chemistry supplier.

Does the rule cover my powder coating pretreatment line?

Nobody can say for sure until the proposal is published. What we do know: the existing Metal Finishing rule (40 CFR Part 433) is defined by processes, and its core operations include coating, which EPA lists as phosphating, chromating and coloring. A shop that phosphates parts and discharges process water may already be a categorical metal finisher.

So the practical question isn't "am I a chrome plater?" It's "what does my control authority already consider me, and what process water am I sending them?" Our guide to powder coating wash water disposal and EPA rules walks through how that's decided.

Why are sewer authorities asking about PFAS already?

In December 2022, EPA issued guidance to states encouraging pretreatment programs to identify industrial users expected to discharge PFAS and to use monitoring and best management practices. That guidance doesn't wait for a federal limit, which is why some shops are seeing PFAS questions or sampling at permit renewal.

States are moving too. North Carolina is one example; see our post on North Carolina pretreatment and PFAS rules.

What should a powder coater do before 2027?

You don't need to wait for the proposal to lower your exposure. Start here:

Ask your chemistry supplier, in writing, whether any product in your pretreatment line contains PFAS.
Pull your current permit or discharge authorization and note its renewal date.
Write down where every gallon of process wash water goes today: sewer, hauler or evaporator.
If you discharge or haul, price out the alternative before the next renewal, not after.

A closed-loop line changes the picture. CPR Systems builds single step clean and coat systems that recycle their wash water, with no process discharge. It reduces chemistry and water use by over 80% compared to wash and hauling operations. The savings calculator shows what that's worth for your shop.

Frequently asked questions

Does iron phosphate or zirconium chemistry contain PFAS?

EPA hasn't named either as a PFAS source in this rulemaking. Formulas vary by product, so ask your supplier for a written statement and check the safety data sheets.

When would a PFAS rule for metal finishing take effect?

EPA expects to propose it in February 2027. Compliance dates come with the final rule, after public comment, so nothing applies the day the proposal is published.

Does a closed-loop system need a sewer discharge permit?

Your control authority decides. With no process discharge there's no process wash water for a permit to cover, but confirm that with them in writing before you start up.

Can CPR Systems test my parts first?

Yes. Tell us the spec you need to meet and we'll clean sample panels free so you can run your own tests.

Ready to take wash water off the table?

Tell us what you coat and the spec you work to. Request a quote, try the savings calculator, or call 888-750-7911 or text 574-233-9111.