What the classification means
Excellent is the highest of four classes and is calculated from the last four bathing seasons, not from today. Today's sample is shown because a single bad day matters to you even when the classification does not move.
Excellent today
PoorSufficientGoodExcellent
Sampled 12 March 06:40 · E. coli 14 cfu/100 ml · intestinal enterococci 6 cfu/100 ml
When it changes
Heavy rain moves sewer overflows and farm runoff into the estuary within hours. We publish a short-term pollution warning when that is forecast, and we publish it before the sample confirms it.
Where the number comes from
A sampler stands in the water at knee depth at N 4390 8998 and fills a bottle. It is analysed within 24 hours at the county laboratory. Nothing about this is modelled.