Vocabulary Catalog List Detail | Terminology Services | US EPA

Vocabulary Catalog


Terms of Environment

Long Name: 
Terms of Environment: Glossary, Abbreviations, and Acronyms
Description: 
Commonly used environmental terms appearing in EPA publications, news releases, and other Agency documents available to the general public, students, the media, and Agency employees.
Publishing Organization: 
Office of the Administrator/Office of External Affairs and Environmental Education
Last Update: 
June 18, 2009
Program Site: 
 

Terms & Acronyms


Contains Begins Exact Match

Results per page:
Term
7Q10
A-Scale Sound Level
Abandoned Well
Abatement
Abatement Debris
Absorbed Dose
Absorption
Absorption Barrier
Accident Site
Acclimatization
Acid
Acid Aerosol
Acid Deposition
Acid Mine Drainage
Acid Neutralizing Capacity
Acid Rain
Acidic
Action Levels
Activated Carbon
Activated Sludge
Activator
Active Ingredient
Activity Plans
Acute Effect
Acute Exposure
Acute Toxicity
Adaptation
Add-on Control Device
Adequately Wet
Administered Dose
Administrative Order
Administrative Order On Consent
Administrative Procedures Act
Administrative Record
Adsorption
Adsorption Partition Coefficient
Adulterants
Adulterated
Advanced Treatment
Advanced Wastewater Treatment
Adverse Effects Data
Advisory
Aerated Lagoon
Aeration
Aeration Tank
Aerobic
Aerobic Treatment
Aerosol
Affected Landfill
Affected Public
Afterburner
Age Tank
Agent
Agent Orange
Agricultural Pollution
Agricultural Waste
Agroecosystem
AHERA Designated Person
Air Binding
Air Changes Per Hour
Air Cleaning
Air Contaminant
Air Curtain
Air Exchange Rate
Air Gap
Air Handling Unit
Air Mass
Air Monitoring
Air/Oil Table
Air Padding
Air Permeability
Air Plenum
Air Pollutant
Air Pollution
Air Pollution Control Device
Air Pollution Episode
Air Quality Control Region
Air Quality Criteria
Air Quality Standards
Air Sparging
Air Stripping
Air Toxics
Airborne Particulates
Airborne Release
Alachlor
Alar
Aldicarb
Algae
Algal Blooms
Algicide
Aliquot
Alkaline
Alkalinity
Allergen
Alluvial
Alternate Method
Alternative Compliance
Alternative Fuels
Alternative Remedial Contract Strategy Contractors
Ambient Air
Ambient Air Quality Standards
Ambient Background Samples
Ambient Measurement
Ambient Medium
Ambient Temperature
Amprometric Titration
Anaerobic
Anaerobic Decomposition
Animal Dander
Animal Studies
Anisotropy
Annular Space
Annulus
Antagonism
Antarctic "Ozone Hole"
Anti-Degradation Clause
Anti-Microbial
Applicable or Relevant and Appropriate Requirements
Applied Dose
Aqueous
Aqueous Solubility
Aquifer
Aquifer Test
Aquitard
Architectural Coatings
Area of Review
Area Source
Aromatics
Arsenicals
Artesian Aquifer
Artesian Well
Asbestos
Asbestos Abatement
Asbestos Assessment
Asbestos-Containing Waste Materials
Asbestos Program Manager
Asbestosis
Ash
Assay
Assessment Endpoint
Assimilation
Assimilative Capacity
Association of Boards of Certification
Attainment Area
Attenuation
Attractant
Attrition
Availability Session
Available Chlorine
Avoided Cost
Back Pressure
Back Siphonage
Backfit
Backflow
Background Level
Backwashing
Backyard Composting
Bacteria
Bactericide
Bacterium
Baffle
Baffle Chamber
Baghouse Filter
Bailer
Baling
Ballistic Separator
Band Application
Banking
Bar Screen
Barrel Sampler
Barrier Coating
Barrier Coatings
Basal Application
Basalt
Bean Sheet
Bed Load
BEN
Bench-Scale Tests
Benefit-Cost Analysis
Benthic
Benthos
Bentonite
Beryllium
Best Available Control Measures
Best Available Control Technology
Best Demonstrated Available Technology
Best Management Practice
BIAX Lamps
Bimetal
Bioaccumulants
Bioassay
Bioavailability
Biochemical Oxygen Demand
Bioconcentration
Biodegradable
Biodiversity
Biological Contaminants
Biological Control
Biological Integrity
Biological Magnification
Biological Measurement
Biological Medium
Biological Oxidation
Biological Oxygen Demand
Biological pesticides
Biological Stressors
Biological Treatment
Biologically Effective Dose
Biologicals
Biomass
Biome
Biomonitoring
Bioremediation
Biosensor
Biosphere
Biostabilizer
Biota
Biotechnology
Biotic Community
Biotransformation
Blackwater
Blood Products
Bloom
BOD5
Body Burden
Bog
Boiler
Boom
Borehole
Botanical Pesticide
Bottle Bill
Bottom Ash
Bottom Land Hardwoods
Bounding Estimate
Brackish
Breakpoint Chlorination
Breakthrough
Breathing Zone
Brine Mud
British Thermal Unit
Broadcast Application
Brownfields
Bubble
Bubble Policy
Buffer
Buffer Strips
Building Cooling Load
Building Envelope
Building Related Illness
Building Shell
Bulk Sample
Bulky Waste
Burial Ground
Buy-Back Center
By-product
Cadmium
Cancellation
Cap
Capacity Assurance Plan
Capillary Action
Capillary Fringe
Capture Efficiency
Carbon Absorber
Carbon Adsorption
Carbon Monoxide
Carbon Tetrachloride
Carboxyhemoglobin
Carcinogen
Carrier
Carrying Capacity
CAS Registration Number
Case Study
Cask
Catalyst
Catalytic Converter
Catalytic Incinerator
Categorical Exclusion
Categorical Pretreatment Standard
Cathodic Protection
Cavitation
Cells
Cementitious
Central Collection Point
Centrifugal Collector
CERCLIS
Channelization
Characteristic
Characterization of Ecological Effects
Characterization of Exposure
Check-Valve Tubing Pump
Chemical Case
Chemical Compound
Chemical Element
Chemical Oxygen Demand
Chemical Stressors
Chemical Treatment
Chemnet
Chemosterilant
Chemtrec
Child Resistant Packaging
Chiller
Chilling Effect
Chisel Plowing
Chlorinated Hydrocarbons
Chlorinated Solvent
Chlorination
Chlorinator
Chlorine-Contact Chamber
Chlorofluorocarbons
Chlorophenoxy
Chlorosis
Cholinesterase
Chromium
Chronic Effect
Chronic Exposure
Chronic Toxicity
Circle of Influence
Cistern
Clarification
Clarifier
Class I Area
Class I Substance
Class II Substance
Clay Soil
Clean Coal Technology
Clean Fuels
Cleaner Technologies Substitutes Assessment
Cleanup
Clear Cut
Clear Well
Climate Change
Cloning
Closed-Loop Recycling
Closure
Co-fire
Coagulation
Coal Cleaning Technology
Coal Gasification
Coastal Zone
Code of Federal Regulations
Coefficient of Haze
Coffin
Cogeneration
Coke Oven
Cold Temperature CO
Coliform Index
Coliform Organism
Collector
Collector Sewers
Colloids
Combined Sewer Overflows
Combined Sewers
Combustion
Combustion Chamber
Combustion Product
Command-and-Control Regulations
Command Post
Comment Period
Commercial Waste
Commercial Waste Management Facility
Commingled Recyclables
Comminuter
Comminution
Common Sense Initiative
Community
Community Relations
Community Water System
Compact Fluorescent Lamp
Compaction
Comparative Risk Assessment
Complete Treatment
Compliance Coal
Compliance Coating
Compliance Cycle
Compliance Monitoring
Compliance Schedule
Composite Sample
Compost
Composting
Composting Facilities
Compressed Natural Gas
Concentration
Condensate
Condensate Return System
Conditional Registration
Conditionally Exempt Generators
Conductance
Conductivity
Cone of Depression
Cone of Influence
Cone Penterometer Testing
Confidential Business Information
Confidential Statement of Formula
Confined Aquifer
Confluent Growth
Consent Decree
Conservation
Conservation Easement
Constituent of Concern
Constituents of Concern
Construction and Demolition Waste
Construction Ban
Consumptive Water Use
Contact Pesticide
Contaminant
Contamination
Contamination Source Inventory
Contingency Plan
Continuous Discharge
Continuous Sample
Contour Plowing
Contour Strip Farming
Contract Labs
Control Technique Guidelines
Controlled Reaction
Conventional Filtration
Conventional Pollutants
Conventional Site Assessment
Conventional Systems
Conventional Tilling
Conveyance Loss
Cooling Electricity Use
Cooling Tower
Cooperative Agreement
Core
Core Program Cooperative Agreement
Corrective Action
Corrosion
Corrosive
Cost/Benefit Analysis
Cost-Effective Alternative
Cost Recovery
Cost Sharing
Cover Crop
Cover Material
Cradle-to-Grave System
Criteria
Criteria Pollutants
Critical Effect
Crop Consumptive Use
Crop Rotation
Cross-Connection
Cross Contamination
Crumb Rubber
Cryptosporidium
Cubic Feet Per Minute
Cullet
Cultural Eutrophication
Cultures and Stocks
Cumulative Ecological Risk Assessment
Cumulative Exposure
Cumulative Working Level Months
Curb Stop
Curbside Collection
Cutie-Pie
Cuttings
Cyclone Collector
Data Call-In
Data Quality Objectives
Day Tank
Dead End
Deadmen
Deaerating Tank
Decant
Decay Products
Dechlorination
Decomposition
Decontamination
Deep-Well Injection
Deflocculating Agent
Deflouridation
Defoliant
Degasification
Degree-Day
Delegated State
Delist
Demand-side Waste Management
Demineralization
Denitrification
Dense Non-Aqueous Phase Liquid
Density
Depletion Curve
Depressurization
Dermal Absorption
Dermal Exposure
Dermal Penetration
Dermal Toxicity
DES
Desalination
Desalinization
Desiccant
Design Capacity
Design Value
Designated Pollutant
Designated Uses
Designer Bugs
Destination Facility
Destratification
Destroyed Medical Waste
Destruction and Removal Efficiency
Destruction Facility
Desulfurization
Detectable Leak Rate
Detection Criterion
Detection Limit
Detention Time
Detergent
Development Effects
Dewater
Diatomaceous Earth
Diatomite
Diazinon
Dibenzofurans
Dichloro-Diphenyl-Trichloroethane
Dicofol
Diffused Air
Diffusion
Digester
Digestion
Dike
Diluent
Dilution Ratio
Dimictic
Dinocap
Dinoseb
Dioxin
Direct Discharger
Direct Drive
Direct Filtration
Direct Push
Direct Runoff
Discharge
Disinfectant
Disinfectant By-Product
Disinfectant Time
Dispersant
Displacement Savings
Disposables
Disposal
Disposal Facilities
Dissolved Oxygen
Dissolved Solids
Distillation
Disturbance
Diversion
Diversion Rate
DNA Hybridization
Dobson Unit
Domestic Application
Domestic Waste
Dosage
Dose
Dose Equivalent
Dose Rate
Dose Response
Dose-Response Assessment
Dose Response Curve
Dose-Response Relationship
Dosimeter
DOT Reportable Quantity
Downgradient
Downstream Processors
DP Hole
Draft
Draft Permit
Drainage
Drainage Basin
Drainage Well
Drawdown
Dredging
Drilling Fluid
Drinking Water Equivalent Level
Drinking Water State Revolving Fund
Drive Casing
Drive Point
Drive Point Profiler
Drop-off
Dual-Phase Extraction
Dump
Duplicate
Dustfall Jar
Dynamometer
Dystrophic Lakes
Ecological Entity
Ecological Exposure
Ecological Impact
Ecological Indicator
Ecological Integrity
Ecological Risk
Ecological Risk Assessment
Ecological Sustainability
Ecology
Economic Poisons
Ecosphere
Ecosystem
Ecosystem Structure
Ecotone
Effluent
Effluent Guidelines
Effluent Limitation
Effluent Standard
Ejector
Electrodialysis
Electromagnetic Geophysical Methods
Electrostatic Precipitator
Eligible Costs
EMAP Data
Emergency and Hazardous Chemical Inventory
Emergency (Chemical)
Emergency Episode
Emergency Exemption
Emergency Removal Action
Emergency Response Values
Emergency Suspension
Emission
Emission Cap
Emission Factor
Emission Inventory
Emission Standard
Emissions Trading
Emulsifier
Encapsulation
Enclosure
End-of-the-pipe
End-use Product
End User
Endangered Species
Endangerment Assessment
Endrin
Energy Management System
Energy Recovery
Enforceable Requirements
Enforcement
Enforcement Decision Document
Engineered Controls
Enhanced Inspection and Maintenance
Enrichment
Entrain
Environment
Environmental Assessment
Environmental Audit
Environmental Equity
Environmental Exposure
Environmental Fate
Environmental Fate Data
Environmental Impact Statement
Environmental Indicator
Environmental Justice
Environmental Lien
Environmental Medium
Environmental Monitoring for Public Access and Community Tracking
Environmental Response Team
Environmental Risk
Environmental Site Assessment
Environmental Sustainability
Environmental Tobacco Smoke
EP Toxic
EPA I.D. Number
Epidemiology
Epilimnion
Episode (Pollution)
Equilibrium
Equivalent Method
Erosion
Established Treatment Technologies
Estimated Environmental Concentration
Estuary
Ethanol
Ethylene Dibromide
Eutrophic Lakes
Eutrophication
Evaporation Ponds
Evapotranspiration
Exceedance
Exclusion
Exclusionary Ordinance
Exempt Solvent
Exempted Aquifer
Exemption
Exotic Species
Experimental Use Permit
Explosive Limits
Exports
Exposure
Exposure Assessment
Exposure Concentration
Exposure Indicator
Exposure Level
Exposure Pathway
Exposure-Response Relationship
Exposure Route
Extraction Procedure
Extraction Well
Extremely Hazardous Substances
Fabric Filter
Facilities Plans
Facility Emergency Coordinator
Facultative Bacteria
Feasibility Study
Fecal Coliform Bacteria
Federal Implementation Plan
Federal Motor Vehicle Control Program
Feedlot
Fen
Ferrous Metals
FIFRA Pesticide Ingredient
Fill
Filling
Filter Strip
Filtration
Financial Assurance for Closure
Finding of No Significant Impact
Finished Water
First Draw
Fix a Sample
Fixed-Location Monitoring
Flammable
Flare
Flash Point
Floc
Flocculation
Floodplain
Floor Sweep
Flow Rate
Flowable
Flowmeter
Flue Gas
Flue Gas Desulfurization
Fluidized
Fluidized Bed Incinerator
Flume
Fluoridation
Fluorides
Fluorocarbons
Flush
Flux
Fly Ash
Fogging
Food Chain
Food Processing Waste
Food Waste
Food Web
Formaldehyde
Formulation
Fossil Fuel
Fracture
Free Product
Freeboard
Fresh Water
Friable
Friable Asbestos
Fuel Economy Standard
Fuel Efficiency
Fuel Switching
Fugitive Emissions
Fume
Fumigant
Functional Equivalent
Fungi
Fungicide
Fungistat
Fungus
Furrow Irrigation
Future Liability
Game Fish
Garbage
Gas Chromatograph/Mass Spectrometer
Gasification
Gasohol
Gasoline Volatility
General Permit
General Reporting Facility
Generally Recognized as Safe
Generator
Genetic Engineering
Genotoxic
Geographic Information System
Geological Log
Geophysical Log
Geothermal/Ground Source Heat Pump
Germicide
Giardia Lamblia
Glass Containers
Global Climate Change
Global Warming
Global Warming Potential
Glovebag
Gooseneck
Grab Sample
Grain Loading
Granular Activated Carbon Treatment
Grasscycling
Grassed Waterway
Graveyard
Gray Water
Greenhouse Effect
Greenhouse Gas
Grinder Pump
Gross Alpha/Beta Particle Activity
Gross Power-Generation Potential
Ground Cover
Ground-Penetrating Radar
Ground Water
Ground-Water Discharge
Ground-Water Disinfection Rule
Ground Water UDI of Surface Water
Ground Water Under the Direct Influence of Surface Water
Groundwater Mining
Gully Erosion
Habitat
Habitat Indicator
Half-Life
Halogen
Halon
Hammer Mill
Hard Water
Hauler
Hazard
Hazard Assessment
Hazard Communication Standard
Hazard Evaluation
Hazard Identification
Hazard Quotient
Hazard Ratio
Hazardous Air Pollutants
Hazardous Chemical
Hazardous Ranking System
Hazardous Substance
Hazardous Waste
Hazardous Waste Landfill
Hazardous Waste Minimization
Hazards Analysis
Hazards Identification
Headspace
Health Advisory Level
Health Assessment
Heat Island Effect
Heat Pump
Heavy Metals
Heptachlor
Herbicide
Herbivore
Heterotrophic Organisms
High-Density Polyethylene
High End Exposure (dose) Estimate
High Intensity Discharge
High-Level Nuclear Waste Facility
High-Level Radioactive Waste
High-Line Jumpers
High-Risk Community
High-Sulfur Coal
High-to-Low-Dose Extrapolation
Highest Dose Tested
Holding Pond
Holding Time
Hollow Stem Auger Drilling
Homeowner Water System
Homogeneous Area
Hood Capture Efficiency
Host
Household Hazardous Waste
Household Waste
Human Equivalent Dose
Human Exposure Evaluation
Human Health Risk
Hydraulic Conductivity
Hydraulic Gradient
Hydrocarbons
Hydrogen Sulfide
Hydrogeological Cycle
Hydrogeology
Hydrologic Cycle
Hydrology
Hydrolysis
Hydronic
Hydrophilic
Hydrophobic
Hydropneumatic
Hypersensitivity Diseases
Hypolimnion
Hypoxia/Hypoxic Waters
Identification Code
Ignitable
IM240
Imhoff Cone
Immediately Dangerous to Life and Health
Imminent Hazard
Imminent Threat
Immiscibility
Impermeable
Imports
Impoundment
In-Line Filtration
In Situ
In-Situ Flushing
In-Situ Oxidation
In-Situ Stripping
In-Situ Vitrification
In Vitro
In Vivo
Incident Command Post
Incident Command System
Incineration
Incineration at Sea
Incinerator
Incompatible Waste
Indemnification
Indicator
Indirect Discharge
Indirect Source
Indoor Air
Indoor Air Pollution
Indoor Climate
Industrial Pollution Prevention
Industrial Process Waste
Industrial Sludge
Industrial Source Reduction
Industrial Waste
Inert Ingredient
Inertial Separator
Infectious Agent
Infectious Waste
Infiltration
Infiltration Gallery
Infiltration Rate
Inflow
Influent
Information Collection Request
Information File
Inhalable Particles
Initial Compliance Period (Water)
Injection Well
Injection Zone
Innovative Technologies
Innovative Treatment Technologies
Inoculum
Inorganic Chemicals
Insecticide
Inspection and Maintenance
Institutional Waste
Instream Use
Integrated Exposure Assessment
Integrated Pest Management
Integrated Risk Information System
Integrated Waste Management
Interceptor Sewers
Interface
Interfacial Tension
Interim (Permit) Status
Internal Dose
Interstate Carrier Water Supply
Interstate Commerce Clause
Interstate Waters
Interstitial Monitoring
Intrastate Product
Inventory (TSCA)
Inversion
Ion
Ion Exchange Treatment
Ionization Chamber
Ionizing Radiation
Irradiated Food
Irradiation
Irreversible Effect
Irrigation
Irrigation Efficiency
Irrigation Return Flow
Irritant
Isoconcentration
Isopleth
Isotope
Isotropy
Jar Test
Joint and Several Liability
Karst
Kinetic Energy
Kinetic Rate Coefficient
Laboratory Animal Studies
Lagoon
Land Application
Land Ban
Land Disposal Restrictions
Land Farming (of Waste)
Landfills
Landscape
Landscape Characterization
Landscape Ecology
Landscape Indicator
Langelier Index
Large Quantity Generator
Large Water System
Laser Induced Fluorescence
Latency
Lateral Sewers
Laundering Weir
Leachate
Leachate Collection System
Leaching
Lead
Lead Service Line
Legionella
Lethal Concentration
Lethal Concentration 50
Lethal Dose
Lethal Dose 50
Lethal Dose Low
Level of Concern
Life Cycle of a Product
Lifetime Average Daily Dose
Lifetime Exposure
Lift
Lifting Station
Light-Emitting Diode
Light Non-Aqueous Phase Liquid
Limestone Scrubbing
Limit of Detection
Limited Degradation
Limiting Factor
Limnology
Lindane
Liner
Lipid Solubility
Liquefaction
Liquid Injection Incinerator
List
Listed Waste
Lithology
Litter
Littoral Zone
Local Education Agency
Local Emergency Planning Committee
Low Density Polyethylene
Low Emissivity Windows
Low-Level Radioactive Waste
Low NOx Burners
Low Sulfur Coal
Lower Detection Limit
Lower Explosive Limit
Lowest Acceptable Daily Dose
Lowest Achievable Emission Rate
Lowest Observed Adverse Effect Level
Macropores
Magnetic Separation
Major Modification
Major Stationary Sources
Majors
Man-Made (Anthropogenic) Beta Particle and Photon Emitters
Management Plan
Managerial Controls
Mandatory Recycling
Manifest
Manifest System
Manual Separation
Manufacturer's Formulation
Manufacturing Use Product
Margin of Exposure
Margin of Safety
Marine Sanitation Device
Marsh
Material Category
Material Safety Data Sheet
Material Type
Materials Recovery Facility
Maximally Exposed Individual
Maximum Acceptable Toxic Concentration
Maximum Available Control Technology
Maximum Contaminant Level
Maximum Contaminant Level Goal
Maximum Exposure Range
Maximum Residue Level
Maximum Tolerated Dose
Measure of Effect/ Measurement Endpoint
Measure of Exposure
Mechanical Aeration
Mechanical Separation
Mechanical Turbulence
Media
Medical Surveillance
Medical Waste
Medium-size Water System
Meniscus
Mercury
Mesotrophic
Metabolites
Metalimnion
Methane
Methanol
Method 18
Method 24
Method 25
Method Detection Limit
Methoxychlor
Methyl Orange Alkalinity
Microbial Growth
Microbial Pesticide
Microclimate
Microenvironmental Method
Microenvironments
Million-Gallons Per Day
Minimization
Mining of an Aquifer
Mining Waste
Minor Source
Minors
Miscellaneous ACM
Miscellaneous Materials
Miscible Liquids
Missed Detection
Mist
Mitigation
Mixed Funding
Mixed Glass
Mixed Liquor
Mixed Metals
Mixed Municipal Waste
Mixed Paper
Mixed Plastic
Mobile Incinerator Systems
Mobile Source
Model Plant
Modified Bin Method
Modified Source
Moisture Content
Molecule
Molten Salt Reactor
Monitoring
Monitoring Well
Monoclonal Antibodies
Monomictic
Montreal Protocol
Moratorium
Morbidity
Mortality
Most Exposed Individual
Most Probable Number
Muck Soils
Mudballs
Mulch
Multi-Media Approach
Multiple Chemical Sensitivity
Multiple Use
Multistage Remote Sensing
Municipal Discharge
Municipal Sewage
Municipal Sludge
Municipal Solid Waste
Municipal-Waste Combustor
Mutagen
Mutagenicity
National Ambient Air Quality Standards
National Emissions Standards for Hazardous Air Pollutants
National Environmental Performance Partnership Agreements
National Estuary Program
National Municipal Plan
National Oil and Hazardous Substances Contingency Plan
National Pollutant Discharge Elimination System
National Priorities List
National Response Center
National Response Team
National Secondary Drinking Water Regulations
Navigable Waters
Necrosis
Negotiations (Under Superfund)
Nematocide
Nephelometric
Netting
Neutralization
New Source
New Source Performance Standards
New Source Review
Nitrate
Nitric Oxide
Nitrification
Nitrilotriacetic Acid
Nitrite
Nitrogen Dioxide
Nitrogen Oxide
Nitrogenous Wastes
Nitrophenols
No Further Remedial Action Planned
No Observable Adverse Effect Level
No-Observed-Effect-Level
No Till
Noble Metal
Noise
Non-Aqueous Phase Liquid
Non-Attainment Area
Non-Binding Allocations of Responsibility
Non-Community Water System
Non-Compliance Coal
Non-Contact Cooling Water
Non-Conventional Pollutant
Non-Degradation
Non-Ferrous Metals
Non-ionizing Electromagnetic Radiation
Non-Methane Hydrocarbon
Non-Methane Organic Gases
Non-Point Sources
Non-potable
Non-Road Emissions
Non-Transient Non-Community Water System
Nondischarging Treatment Plant
Nonfriable Asbestos-Containing Materials
Nonhazardous Industrial Waste
Notice of Deficiency
Notice of Intent to Cancel
Notice of Intent to Deny
Notice of Intent to Suspend
Nuclear Reactors and Support Facilities
Nuclear Winter
Nuclide
Nutrient
Nutrient Pollution
Ocean Discharge Waiver
Odor Threshold
OECD Guidelines
Off-Site Facility
Office Paper
Offsets
Offstream Use
Oil and Gas Waste
Oil Desulfurization
Oil Fingerprinting
Oil Spill
Oligotrophic Lakes
On-Scene Coordinator
On-Site Facility
Onboard Controls
Onconogenicity
One-hit Model
Opacity
Open Burning
Open Dump
Operable Unit
Operating Conditions
Operation and Maintenance
Operator Certification
Optimal Corrosion Control Treatment
Oral Toxicity
Organic
Organic Chemicals/Compounds
Organic Matter
Organism
Organophosphates
Organophyllic
Organotins
Original AHERA Inspection/Original Inspection/Inspection
Original Generation Point
Ortho P
Osmosis
Other Ferrous Metals
Other Glass
Other Nonferrous Metals
Other Paper
Other Plastics
Other Solid Waste
Other Wood
Outdoor Air Supply
Outfall
Overburden
Overdraft
Overfire Air
Overflow Rate
Overland Flow
Oversized Regulated Medical Waste
Overturn
Oxidant
Oxidation
Oxidation Pond
Oxidation-Reduction Potential
Oxygenated Fuels
Oxygenated Solvent
Ozonation
Ozonator
Ozone
Ozone Depletion
Ozone Hole
Ozone Layer
Packaging
Packed Bed Scrubber
Packed Tower
Packer
Palatable Water
Pandemic
Paper
Paper Processor/Plastics Processor
Parameter
Paraquat
Parshall Flume
Part A Permit
Part B Permit
Participation Rate
Particle Count
Particulate Loading
Particulates
Partition Coefficient
Parts Per Billion
Parts Per Million
Passive Smoking
Passive Treatment Walls
Pathogens
Pathway
Pay-As-You-Throw
Peak Electricity Demand
Peak Levels
Percent Saturation
Perched Water
Percolating Water
Percolation
Performance Bond
Performance Data (For Incinerators)
Performance Standards
Periphyton
Permeability
Permissible Dose
Permissible Exposure Limit
Permit
Persistence
Persistent Pesticides
Personal Air Samples
Personal Measurement
Personal Protective Equipment
Pest
Pest Control Operator
Pesticide
Pesticide Regulation Notice
Pesticide Tolerance
Petroleum
Petroleum Derivatives
pH
Pharmacokinetics
Phenolphthalein Alkalinity
Phenols
Phosphates
Phosphogypsum Piles
Phosphogypsum Stacks
Phosphorus
Phosphorus Plants
Photochemical Oxidants
Photochemical Smog
Photosynthesis
Physical and Chemical Treatment
Phytoplankton
Phytoremediation
Phytotoxic
Phytotreatment
Picocuries Per Liter
Piezometer
Pigtail
Pilot Tests
PL
Plankton
Plant-Derived Pesticide
Plasma Arc Reactors
Plasmid
Plastics
Plate Tower Scrubber
Plug Flow
Plugging
Plume
Plutonium
PM-10/PM-2.5
Pneumoconiosis
Point-of-Contact Measurement of Exposure
Point-of-Disinfectant Application
Point-of-Use Treatment Device
Point Source
Pollen
Pollutant
Pollutant Pathways
Pollutant Standard Index
Pollution
Pollution Prevention
Polonium
Polychlorinated Biphenyls
Polyelectrolytes
Polyethylene Terepthalate
Polymer
Polyvinyl Chloride
Population
Population at Risk
Porosity
Portal-of-Entry Effect
Post-Chlorination
Post-Closure
Post-Consumer Materials
Post-Consumer Recycling
Post-Consumer Waste
Potable Water
Potential Dose
Potentially Responsible Party
Potentiation
Potentiometric Surface
Pre-Consumer Materials
Pre-Consumer Waste
Pre-Harvest Interval
Precautionary Principle
Prechlorination
Precipitate
Precipitation
Precipitator
Precursor
Preliminary Assessment
Prescriptive
Pressed Wood Products
Pressure Sewers
Pressure, Static
Pressure, Total
Pressure, Velocity
Pretreatment
Prevalent Level Samples
Prevalent Levels
Prevention of Significant Deterioration
Primacy
Primary Drinking Water Regulation
Primary Effect
Primary Standards
Primary Treatment
Primary Waste Treatment
Principal Organic Hazardous Constituents
Prions
Prior Appropriation
Probability of Detection
Process Variable
Process Verification
Process Wastewater
Process Weight
Producers
Product Level
Product Water
Products of Incomplete Combustion
Project XL
Propellant
Proportionate Mortality Ratio
Proposed Plan
Proteins
Protocol
Protoplast
Protozoa
Public Comment Period
Public Health Approach
Public Health Context
Public Hearing
Public Notice
Public Water System
Publicly Owned Treatment Works
Pumping Station
Pumping Test
Purging
Push Technology
Putrefaction
Putrescible
Pyrolysis
Qualitative Use Assessment
Quality Assurance
Quality Control
Quench Tank
Radiant Energy
Radiation
Radiation Standards
Radio Frequency Radiation
Radioactive Decay
Radioactive Disintegration
Radioactive Substances
Radioactive Waste
Radioactivity
Radioisotopes
Radionuclide
Radius of Influence
Radius of Vulnerability Zone
Radon
Radon Daughters
Radon Decay Products
Radon Progeny
Rainbow Report
Rasp
Raw Agricultural Commodity
Raw Sewage
Raw Water
Re-entry
Reactivity
Reaeration
Real-Time Monitoring
Reasonable Further Progress
Reasonable Maximum Exposure
Reasonable Worst Case
Reasonably Available Control Measures
Reasonably Available Control Technology
Recarbonization
Receiving Waters
Receptor
Recharge
Recharge Area
Recharge Rate
Reclamation
Recombinant Bacteria
Recombinant DNA
Recommended Maximum Contaminant Level
Reconstructed Source
Reconstruction of Dose
Record of Decision
Recovery Rate
Recycle
Recycling and Reuse Business Assistance Centers
Recycling Economic Development Advocates
Recycling Mill
Recycling Technical Assistance Partnership National Network
Red Bag Waste
Red Border
Red Tide
Redemption Program
Reduction
Reentry Interval
Reference Dose
Reformulated Gasoline
Refueling Emissions
Refuse
Refuse Reclamation
Regeneration