When the E. coli data for 2007 to 2012 were divided into sampling
months, generally lower counts were seen in the period from
February throughout May. In addition, there are somewhat higher
E. coli values in samples collected in January, June, July, October and
December. A possible explanation for seasonally high values may be
periodical transport of manure from farm animals, or overload of
the sewage system in periods with high rainfall. Rainfall can