For toxic endpoints, are milligrams per liter (mg / L) equivalent to parts per million (ppm)? | US EPA

Likely AI

www.epa.govby topic and sectorApril 10, 2019Submitted July 28, 2026

The endpoint concentrations for regulated toxic substances under the risk management program rule (40 CFR Part 68 Appendix A) are listed in units of milligrams per liter (mg/L). Is this equivalent to parts per million (ppm)? No, mg/L is not always

The Verdict

ClassificationLikely AI

ConfidenceMedium confidence

Analyzedtext

Community Verdict

Be the first to vote on this assessment.

Embed Badge

Add this badge to your site to show the AI classification for this content.

[![Real Press](https://real.press/api/badge/3cfb761a-47d1-4a28-917e-bc3a9b1d981b)](https://real.press/content/3cfb761a-47d1-4a28-917e-bc3a9b1d981b)