Table 1.

Classification of 60 sampling days at Swansea Bay designated sampling point during summer 2011 using the criteria of the European Bathing Water Directive (EU, 2006: Annex I and II, Pages 46 to 48).

Category	Escherichia coli	Confirmed intestinal enterococci (cIE)	Overall
Excellenta	33	25	25
Goodb	12	7	6
Sufficientc	6	8	6
Poord	9	20	23

^a95%ile E. coli ≤ 250 cfu/100 ml, 95%ile cIE ≤100 cfu/100 ml.

^b95%ile E. coli ≤ 500 cfu/100 ml, 95%ile cIE ≤200 cfu/100 ml.

^c90%ile E. coli ≤ 500 cfu/100 ml, 90%ile cIE ≤185 cfu/100 ml.

^d90%ile E. coli > 500 cfu/100 ml, 90%ile cIE >185 cfu/100 ml.

Where: cfu = colony forming units and the limit values are geometric, calculated using the mean $\left(\overline{X}\right)$ and standard deviation (SD) of log₁₀ concentrations:

$90\%ile={10}^{(\overline{X}+1.282\times SD)}$

$95\%ile={10}^{(\overline{X}+1.65\times SD)}$