Dear Christina:

The Sacred Host falling to the floor happens from time to time. When it happens preferably the priest or deacon, or the Extraordinary Minister of Holy Communion, whoever is distributing the Sacred Host, should retrieve the Sacred Host immediately. The communicant, however, can also retrieve the fallen Sacred Host. Unless the Sacred Host is unsuitable for consumption due to being on the floor, it should be consumed immediately. Anyone can consume the retrieved Sacred Host.

In my opinion, however, the woman who pick up the Sacred Host, really should not have presented the Host to you as if she was an extraordinary minister. If you wished to receive on the tongue, then she should give the Sacred Host to the priest or extraordinary minister and then he present the Sacred Host to you again. If you receive in the hand (which is an extraordinary form), then the woman could have simply given the Sacred Host to you (without saying "The body of Christ", etc.

If consumption of the Sacred Host is not possible or is not prudent for any reason, then the Priest can isolate the Sacred Host to rinse it down the sacarium (a special sink in the sacristy that empties directly to the ground under the Church) after Holy Mass.

The priest or extraordinary minister needs to take care to ensure that no particles remain on the floor. If there are any particles, then a linen needs to be placed over the area where the Host fell to make sure no one steps on it. Then, after Mass the area needs to be cleaned with water and the water disposed in a sacarium. 

If any of the Blood is spilled on the floor, again a linen should be placed over it to avoid people stepping on it, then as soon as possible the area needs to be cleaned with water, and the water drained into the sacarium.

The water in which the Host was dissolved, or in which the floor was cleaned where the Blood was spilled, is never to be poured into a drain that goes into the sewer system. It is always to be drained into the sacarium.

This is not a trivial issue, thus the communion line should be halted until the Sacred Host is retrieved, and, if necessary, a linen placed over the area when there are particles remaining on the floor. The same for the line for the blood. The line should be halted until the spilled blood can properly cleaned or be covered with a linen.

Unfortunately, extraordinary ministers of Holy Communion are often not taught what to do in situations like this. It is the pastor's duty to ensure the extraordinary ministers are fully informed and trained on this issues.

God Bless,
Bro. Ignatius Mary