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Uranium in drinking water

Also called U, Combined uranium.

Legal limit
30 ppb
Health goal
Zero

Values in parts per billion (ppb). Comes from the source.

Contaminant referenceLimits checked Oct. 4, 2026

Where the rules stand

Final MCL of 30 ppb (30 µg/L), in effect since December 8, 2003. The health goal is zero.

The scale every TapBuff report uses for this contaminant: the legal line at the middle, twice it at the right.

Has your utility been cited for it?

Federal data carries uranium results only when a violation occurred. The measured level is in your utility’s own annual report. How to read it.

Matched to your utility using EPA records

What EPA says about health

EPA lists an increased risk of cancer and harm to the kidneys from long-term exposure above the MCL.

Where it comes from

EPA lists erosion of natural deposits.

What handles it

  • NSF/ANSI 58

    Claim to look for: Uranium

    WQA listing wording for reverse osmosis systems. NSF's listing search has no uranium claim.

Sources

  1. National Primary Drinking Water Regulations, U.S. EPA. Checked Oct. 4, 2026.
  2. Search for NSF Certified Drinking Water Treatment Units (standards and reduction claims lists), NSF. Checked Oct. 4, 2026.
  3. Find WQA Certified Products (Gold Seal listings by standard and claim), Water Quality Association. Checked Oct. 4, 2026.
  4. SDWA Dataset Download Summary (codes from SDWA_REF_CODE_VALUES.csv, 2026 Q2 extract), U.S. EPA ECHO. Checked Oct. 4, 2026.