- ## [Get to know us](/en/veolias-expertise-sanitary-engineering)
    
    
    - [OFIS : Sanitary engineering](/en/veolias-expertise-sanitary-engineering)
    - [Our team](/en/get-know-us/our-team)
    - [Our sites](/en/get-know-us/our-sites)
        - [Aix-en-Provence offices](/en/get-know-us/our-sites/aix-en-provence-offices)
        - [Lyon offices](/en/get-know-us/our-sites/lyon-offices)
        - [Strasbourg offices](/en/get-know-us/our-sites/strasbourg-offices)
        - [Bordeaux offices](/en/get-know-us/our-sites/bordeaux-offices)
        - [Nantes offices](/en/get-know-us/our-sites/nantes-offices)
        - [Aubervilliers Head office](/en/get-know-us/our-sites/aubervilliers-head-office)
        - [Head Office](/en/get-know-us/our-sites/head-office)
    - [Our certifications](/en/get-know-us/certifications)
    - [Veolia Group](https://www.veolia.com/en/veolia-group/veolia-in-brief)
- ## [Certified skills](/en/our-certified-skills)
    
    
    - [Water](/en/certified-skills/water)
    - [Air](/en/certified-skills/air)
    - [Energy](/en/certified-skills/energy)
- ## [References](/en/our-clients)
    
    
    - [Tertiary buildings](/en/references/tertiary-buildings)
    - [Buildings open to the public](/en/references/buildings-open-public)
    - [Housing](/en/references/housing)
    - [Industry](/en/references/industry)
    - [Healthcare](/en/references/healthcare)
- ## [Newsroom](/en/newsroom/newsroom)
    
    
    - [Our news](/en/newsroom/newsroom)
        - [Habitat: Air quality on the front line](/en/newsroom/newsroom/habitat-air-quality-front-line)
        - [0 accidents in the course of work, that's the OFIS objective](/en/newsroom/newsroom/0-accidents-course-work-thats-ofis-objective)
        - [OFIS celebrates its 30th anniversary](/en/newsroom/newsroom/ofis-celebrates-its-30th-anniversary)
        - [OFIS expertise made available to Médecins Sans Frontières](/en/newsroom/newsroom/ofis-expertise-made-available-medecins-sans-frontieres)
        - [Covid-19: monitor indoor air quality with AIR Control Covid](/en/newsroom/newsroom/covid-19-monitor-indoor-air-quality-air-control-covid)
        - [OFIS winner of the Impact Awards](/en/newsroom/newsroom/ofis-winner-impact-awards)
        - [Indoor air quality: OFIS commissioned by Kingston Airport](/en/newsroom/newsroom/indoor-air-quality-ofis-commissioned-kingston-airport)
        - [OFIS presents its 2019 portfolio: L'Essentiel](/en/newsroom/newsroom/ofis-presents-its-2019-portfolio-lessentiel)
        - [Aix-en-Provence | Maintaining air and water quality in collective housing](/en/newsroom/newsroom/aix-en-provence-maintaining-air-and-water-quality-collective-housing)
        - [OFIS present at the 7th morning of the SEIQA expert panel](/en/newsroom/newsroom/ofis-present-7th-morning-seiqa-expert-panel)
        - [OFIS invites Bordeaux professionals to a morning on water and air in buildings](/en/newsroom/newsroom/ofis-invites-bordeaux-professionals-morning-water-and-air-buildings)
        - [OFIS participates in the Hopitech Days, on 5 October 2016 in Saint-Etienne](/en/newsroom/newsroom/ofis-participates-hopitech-days-5-october-2016-saint-etienne)
        - [Canada: OFIS support the Montreal University Hospital](/en/newsroom/newsroom/canada-ofis-support-montreal-university-hospital)
    - [Our publications](/en/newsroom/our-publications)
- ## [Contact us](/en/contact-us)
    
    
    - [A question, a quote?](/en/contact-us)
    - [Carreers](/en/contact-us/carreers)