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Short entry

Perchlorate in drinking water

We haven’t published a full explainer for Perchlorate 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
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Reference values

No federal limit for Perchlorate — one state sets its own.

State limit · MCLCalifornia state limit
6 ppb

An enforceable limit for public water systems in that state.

Applies to
Public water systems in that state, not private wells
Status
In force
Source
California state MCL (6 µg/L) · 22 CCR §64432 (Table 64432-A)
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 Perchlorate yet, so we don’t describe methods or show products on this page.

References

Where these facts come from

  • 22 CCR §64432 (Table 64432-A) · California state MCL (6 µg/L)
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