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Dioxin (2,3,7,8-TCDD) in drinking water

Also listed as Dioxin · 2,3,7,8-TCDD

We haven’t published a full explainer for Dioxin (2,3,7,8-TCDD) yet, so this page only shows what we can stand behind and where to go next.

This page can’t tell you what’s in your tap water.
Only a test of water from your own tap can. Public-system results describe the system, not your home.
1 source
01Private well guidanceWell Water · asks about your well02Check your public systemWater Check · system results only03Search WaterDecoderRelated pages and tools
Reference values

An enforceable limit for public water systems.

Enforceable limit · MCLFederal · public water systems
0.00003 ppb

The highest level allowed in water a public system delivers. A legal limit, not a health goal.

Applies to
Water delivered by public water systems, not private wells
Status
In force
Source
EPA NPDWR MCL (3e-8 mg/L) · 40 CFR §141.61(c)
Your stateNot held yetStates may set their own references. We don’t hold a state reference for dioxin (2,3,7,8-TCDD) yet.
Is it in my water?

Only a test can tell.

Start with the tool that matches your water source.

Private well → Well WaterAsks about your wellPublic water → Water CheckSystem results, not your tap · asks for your ZIP
Treatment

No treatment evidence yet.

We don’t hold treatment evidence for Dioxin (2,3,7,8-TCDD) yet, so we don’t describe methods or show products on this page.

References

Where these facts come from

  • 40 CFR §141.61(c) · EPA NPDWR MCL (3e-8 mg/L)
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