JAPCA— Journal of Air Pollution Control Association
JCL— Job Control Language
JEC— Joint Economic Committee
JECFA— Joint Expert Committee of Food Additives
JEIOG— Joint Emissions Inventory Oversight Group
JLC— Justification for Limited Competition
JMPR— Joint Meeting on Pesticide Residues
JNCP— Justification for Non-Competitive Procurement
JOFOC— Justification for Other Than Full and Open Competition
JPA— Joint Permitting Agreement
JSD— Jackson Structured Design
JSP— Jackson Structured Programming
JTU— Jackson Turbidity Unit

Jar Test— A laboratory procedure that simulates a water treatment plant’s coagulation/flocculation units with differing chemical doses, mix speeds, and settling times to estimate the minimum or ideal coagulant dose required to achieve certain water quality goals.

Joint and Several Liability— Under CERCLA, this legal concept relates to the liability for Superfund site cleanup and other costs on the part of more than one potentially responsible party (i.e. if there were several owners or users of a site that became contaminated over the years, they could all be considered potentially liable for cleaning up the site.)