awsome and informative. we too last feb and again in late march noted a few occasions where the brown river water was entering the sea and traveling up the beach all the way past Rooms, being diluted along the way but very noticeable and disconcerning. i have heard many stories of what this might be from sewage to brown dirt runoff. it would be nice if someone local could perform the tests as suggested for rjonsun to analyze AND to have someone test the sea water down the beach when the "brown tide" is noted. many thanks rj for the details and education!