My dad is retired, but used to work for the City of Oakland's Sewage and Drainage Department. He started in the rough, being one to suit-up and clear out blockages, and then became a supervisor so that he no longer was directly in contact with drains and sewage lines but was still around them. I remember he was often out at night working during rain storms while I was growing up. This job definitely had chemical and biological health hazards in terms of exposure to the contents of sewers and drains. The only part of the hygiene hierarchy that I think fits with this is the lower level of protective equipment/gear. Some barriers to this may be personal opinions ("Oh I don't need to wear gloves or a mask") which could be addressed through education and mandatory gear.
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