O3 - Ozone
OA - Office of Administration
OA - Office of Audits
OA 0 Office of the Administrator
OADEMQA - Office of Acid Deposition, Environmental Monitoring, and Quality Assurance
OAE - Office of Analysis and Evaluation
OALJ - Office of Administrative Law Judges
OAQPS - Office of Air Quality Planning and Standards
OAR - Office of Air and Radiation
OARM - Office of Administration Resources Management
OASDI - Old Age Survivors and Disability Insurance
OASIS - OERR Info System -
OC - Object Class
OC - Office of the Comptroller
OCAPO - Office of Compliance Analysis and Program Operations
OCD - Offshore and Coastal Dispersion Model
OCE - Office of Criminal Enforcement
OCEM - Office of Cooperative Environmental Management
OCESL - Office of Criminal Enforcement and Special Litigation
OCI - Office of Criminal Investigation
OCI - Organizational Conflicts of Interest
OCIL - Office of Community and Intergovernmental Liaison
OCIR - Office of Community and Intergovernmental Relations
OCIS - On-Line chemical Information System
OCL - Offoce of Congressional Liaison
OCM - Office of Compliance Monitoring
OCI - Organizational Conflicts of Interest
OCONUS - Outside the Contiguous/Continental United States
OCPSF - Organic Chemical, Plastics and Synthetic Fibers (Manufacturing Point Source Category)
OCR - Office of Civil Rights
OCR - Office of Community Relations
OCR - Optical Character Reader
OCS - Outer Continental Shelf
OCSLA - Outer Continental Shelf Lands Act
OD - Office of Director
OD - Operations Division
OD - Organizational Development
OD - Outside Diameter
ODA - Office of Deputy Administrator
ODASA - Office of Deputy Assistant Secretary of the Army
ODATS - Office Director Assignment Tracking System
ODC - Ozone-depleting Chemical
ODES - Ocean Data Evaluation System
ODI - Open Dump Inventory
ODN - Obligation Document Number
ODP - Ozone-depletion Potential
ODS - Ozone-depleting Substance
ODW - Office of Drinking Water
OE - Office of Enforcement
OEA - Office of External Affairs
OECA - Office of Enforcement and Compliance Assurance
OECD - Organization for Economic Cooperation and Development
OECD SIDs - Screening Information Data Set (within OECD)
OECM - Office of Enforcement and Compliance Monitoring
OEET - Office of Environmental Engineering and Technology
OEHHA - Office of Environmental Health Hazard Assessment
OEL - Occupational Exposure Limit
OEM - Original Equipment Manufacturer
OEOB - Old Executive Office Building
OEP - Office of Enforcement Policy
OEP - Office of Environmental Policy
OEP - Office of External Programs
OEPA - Ohio Environmental Protection Agency
OEPER - Office of Environmental Processes and Effects Research
OER - Office of Exploratory Research
OERR - Office of Emergency and Remedial Response
OES - Office of Emergency Services
OES - Office of Executive Support
OF - Optional Form
OFA - Office of Federal Activities
OFM - Organic Feed Material
OFPPA - Office of Federal Procurement Policy Act
OFSPS - Office of Federal Statistical Policy and Standards
O&G - Oil and Gas
OGC - Office of General Counsel
OGE - Office of Government Ethics
OGR - Office of Government Relations
OGWP - Office of Groundwater Protection
OHEA - Office of Health and Environmental Assessment
OHEA - Office of Health Effects Assessment
OHMTADS - Oil and Hazardous Material Technical Assistance Data System
OHR - Office of Health Research
OHRM - Office of Human Resources Management
OHSS - Occupational Health and Safety Staff
OI - Office of Investigations
OIA - Office of International Activities
OIG - Oggice of Inspector General
OIL - Office of Intergovernmental Liaison
OILHM - Oil and Hazardous Material Information System
OIRA - Office of Information and Regulatory Affairs
OIRM - Office of Information Resources management
OIS - Office of Information Services
OIT - Office of Information Technology
OLA - Office of Legislative Analysis
OLTS - On Line Tracking System
O&M - Operation and Maintenance
OMB - Office of Management and Budget
OMC - Optimum Moisture Content
OMEP - Office of Marine and Estuarine Protection
OMMSQA - Office of Modeling, Monitoring Systems and Quality Assurance
OMPC - Office of Municipal Pollution Control
OMPE - Office of Management Planning and Evaluation
OMS - Office of Mobile Sources
OMSE - Office of management Systems and Evaluation
OMTA - Office of mangement and Technical Assessment
OO - Operations Office
ONWI - Office of Nuclear Waste Isolation
OP - Operating Plan
OPA - Office of Policy Analysis
OPA - Office of Public Affairs
OPA - Oil Pollution Act (of 1990)
OPAC - Overall Performance appraisal Certification
OPAR - Office of Policy Analysis and Review
OPCW - Organization for the Prevention of Chemical Warfare
OPD - Office of Program Development
OPF - Official Personnel Folder
OPFT - Other than Permanent Full Time
OPFTE - Other than Permanent Full Time Equivalent
OPL - Operating Parameter Limit
OPM - Office of Program Management
OPME - Office of Program Management and Evaluation
OPMO - Office of Program Management Operations
OPMS - Office of Program Management and Support
OPMT - Office of Program Management and Technology
OPP - Office of Pesticide Programs
OPPAS - Office of Pesticide Programs Administrative Support Systems
OPPE - Office of Policy, Planning and Evaluation
OPPI - Office of Policy, Planning and Information
OPPM - Office of Policy and Program management
OPPT - Office of Pollution Prevention and Toxics
OPPTS - Office of Prevention, Pesticides and Toxic Substances (includes OPP and OPPT; EPA)
OPS - Organic Chemicals/Plastics and Synthetics (Industrial Category)
OPTS - Office of Pesticides and Toxic Substances
OPTSRTS - Office of Pesticides and Toxic Substances Regulation Tracking System
ORALTOX - Acute Oral Toxicity for Birds, Mice Rats
ORC - Office of Regional Counsel
ORD - Office of Research and Development
ORDIS - Office of Research and Development Information Systems
ORM - Other Regulated Material
ORMS - Office Resources Management System
ORNL - Oak Ridge National Laboratory
ORO - Office of Regional Operations
ORP - Office of Radiation Programs
ORP - Oxidation-Reduction Potential
ORPM - Office of Research Program Management
ORS - Office of Regulatory Support
ORSSA - Office of Regulatory Support and Scientific Analysis
ORV - Off-Road Vehicle
OSC - On-Scene Coordinator
OSC - Options Selection Committee
OSDBU - Office of Small and Disadvantaged Business Utilization
OSDH - Oklahoma State Department of Health
OSHA - Occupational Safety and Health Act (1970)
OSHA - Occupational Safety and Health Administration
OSHC - Occupational Safety and Health Cases
OSM - Office of Surface Mining Reclamation and Enforcement
OSR - Office of Standards and Regulations
OSTP - Office of Science and Technology Policy
OS/VS - Operating System/Virtual Storage
OSW - Office of Solid Waste
OSWER - Office of Solid Waste and Emergency Response
OT - Overtime
OTA - Office of Technology Assessment
OTAG - Ozone Transport Assessment Group
OTC - Over-the-counter
OTC - Ozone Transport Commission
OTP - Office of Territorial Programs
OTR - Ozone Transport Region
OTS - Office of Toxic Substances (now OPPT)
OTSMTS - Office of Toxic Substances Milestone Tracking System
OTVC - Open Top Vapor Cleaner
OU - Operable Unit
OUO - Official Use Only
OUST - Office of Underground Storage Tanks
OVA - Organic Vapor Analyzer
OVM - Organic Vapor Monitor
OW - Office of Water
OWCP - Office of Workers Compensation Programs
OWEC - Office of Wastewater Enforcement and Compliance
OWEP - Oily Waste Extraction Program
OWP - Office of Wetlands Protection
OWPE - Office of Waste Programs Enforcement
OWPO - Office of Water Program Operations
OWRS - Office of Water Regulations and Standards
Ox - Total Oxidants
OX - Oxidation
OY - Operating Year
OYG - Operating Year Guidance
OZIPP - Kinetics Model and Ozone Isopleth Plotting Package
OZIPPM - Modified Ozone Isopleth Plotting Package
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