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In page Médecins Sans Frontières:

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Sanitation is an essential part of field missions, and it may include education of local medical staff in proper sterilisation techniques, sewage treatment projects, proper waste disposal, and education of the population in personal hygiene. Proper wastewater treatment and water sanitation are the best way to prevent the spread of serious water-borne diseases, such as cholera.[3] Simple wastewater treatment systems can be set up by volunteers to protect drinking water from contamination.[4] Garbage disposal could include pits for normal waste and incineration for medical waste.[5] However, the most important subject in sanitation is the education of the local population, so that proper waste and water treatment can continue once MSF has left the area.[citation needed]