40 CFR § 116.2 - Abbreviations.
---
identifier: "/us/cfr/t40/s116.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 116.2 - Abbreviations."
title_number: 40
title_name: "Protection of Environment"
section_number: "116.2"
section_name: "Abbreviations."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "D"
subchapter_name: "WATER PROGRAMS"
part_number: "116"
part_name: "DESIGNATION OF HAZARDOUS SUBSTANCES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1251"
cfr_part: "116"
---
# 116.2 Abbreviations.
ppm = parts per million
mg = milligram(s)
kg = kilogram(s)
mg/l = milligrams(s) per liter= (approx.) ppm
mg/kg = milligram(s) per kilogram= (approx.) ppm
[43 FR 10474, Mar. 13, 1978]