From Helen Morrison this morning:

Here is something Pat at Lyford Pond did about the geese.  She put a life-size loon "decoy" on her dock and the geese do not come to it.  They are afraid of loons.   I don't know if it would work to put several along the shore line where these geese are hanging out.

One could also call Fish and Wildlife and see if they have suggestions.  Maybe I will do so Monday and let you know what they said.

And as you say, perhaps the fireworks will drive them off.

Take care.

HDM

I will add a little more to this.  The question came up as to whether there is a difference between human and animal strains of E.coli bacteria the water at the beach is tested for.  I found a site explaining more about E.coli  It would seem from this the geese could be the culprits.  We're still hoping to find more information and will keep you posted.  In the meantime, be aware that big flock of geese has been hanging around, especially in the big pond, and wherever they go, they leave a terrible mess.  Cleaning up is a chore.  The tendency would be to hose off the droppings off the lawn; but by doing so, you will be further contaminating the water along your shoreline.  It's possible that the rain washed a lot of that material into the water and that's why the unusually high bacteria count.  

Just please be careful - watch where children are playing, and if someone becomes ill and doesn't improve in a few days, it's probably time to get a medical opinion.