O
Objective Tree
Office for Coordination of Humanitarian Affairs
Abbreviation: OCHA
Offsite Sanitation
On-site Storage and Treatments
On-site Wastewater Treatment
Onsite Sanitation
Open Comparative Consequence Analysis
Abbreviation: OCCA
Open Defecation Field
Open Defecation Free
Abbreviation: ODF
Open Planning of Sanitation Systems
Abbreviation: OPSS
Operating expenses
Abbreviation: OpEx
Operation and Maintenance
Abbreviation: O&M
Operation and Maintenance of Water Distribution
Optimisation of Water Use at Home
Optimisation of Water Use in Agriculture
Optimisation of Water Use in Industry
Organic
Synonyms: Organic Compound
Organic Matter
Organic Nitrogen
Organic Waste
Organics
Synonyms: Organic Waste
Organização das Nações Unidas para Alimentação e a Agricultura
Abbreviation: FAO
Organochlorine pesticide
Synonyms: OC
Abbreviation: OC
Other Water Sources
Overhung Latrine
Oxidation
Oxidation Ditch
Abbreviation: OD