Annex I of the DIRECTIVE 2006/7/EC

OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 15 February 2006 concerning the management of bathing water quality.

For inland waters

A B C D E

Parameter Excellent quality Good quality Sufficient quality Reference methods of analysis

1 Intestinal enterococci (cfu/100 ml) 200 ^(*) 400 ^(*) 330 ^(**) ISO 7899-1 or ISO 7899-2

2 Escherichia coli (cfu/100 ml) 500 ^(*) 1 000 ^(*) 900 ^(**) ISO 9308-3 or ISO 9308-1

	A	B	C	D	E
1	Intestinal enterococci (cfu/100 ml)	200 ^(*)	400 ^(*)	330 ^(**)	ISO 7899-1 or ISO 7899-2
2	Escherichia coli (cfu/100 ml)	500 ^(*)	1 000 ^(*)	900 ^(**)	ISO 9308-3 or ISO 9308-1

For coastal waters and transitional waters

A B C D E

Parameter Excellent quality Good quality Sufficient quality Reference methods of analysis

1 Intestinal enterococci (cfu/100 ml) 100 ^(*) 200 ^(*) 185 ^(**) ISO 7899-1 or ISO 7899-2

2 Escherichia coli (cfu/100 ml) 250 ^(*) 500 ^(*) 500 ^(**) ISO 9308-3 or ISO 9308-1

	A	B	C	D	E
1	Intestinal enterococci (cfu/100 ml)	100 ^(*)	200 ^(*)	185 ^(**)	ISO 7899-1 or ISO 7899-2
2	Escherichia coli (cfu/100 ml)	250 ^(*)	500 ^(*)	500 ^(**)	ISO 9308-3 or ISO 9308-1

NOTES

^(*) Based upon a 95‑percentile evaluation. See Annex II.

^(**) Based upon a 90‑percentile evaluation. See Annex II.

NOTES (Annex II)

(^b) Based upon percentile evaluation of the log₁₀ normal probability density function of microbiological data acquired from the particular bathing water, the percentile value is derived as follows:

(i) Take the log₁₀ value of all bacterial enumerations in the data sequence to be evaluated. (If a zero value is obtained, take the log₁₀ value of the minimum detection limit of the analytical method used instead.)

(ii) Calculate the arithmetic mean of the log₁₀ values (μ).

(iii) Calculate the standard deviation of the log₁₀ values (σ).

The upper 90‑percentile point of the data probability density function is derived from the following equation: upper 90‑percentile = antilog (μ + 1,282 σ).

The upper 95‑percentile point of the data probability density function is derived from the following equation: upper 95‑percentile = antilog (μ + 1,65 σ).

	A	B	C	D	E
	Parameter	Excellent quality	Good quality	Sufficient quality	Reference methods of analysis
1	Intestinal enterococci (cfu/100 ml)	200 ^(*)	400 ^(*)	330 ^(**)	ISO 7899-1 or ISO 7899-2
2	Escherichia coli (cfu/100 ml)	500 ^(*)	1 000 ^(*)	900 ^(**)	ISO 9308-3 or ISO 9308-1

^(*)	Based upon a 95‑percentile evaluation. See Annex II.
^(**)	Based upon a 90‑percentile evaluation. See Annex II.

(^b)	Based upon percentile evaluation of the log₁₀ normal probability density function of microbiological data acquired from the particular bathing water, the percentile value is derived as follows:
	(i)	Take the log₁₀ value of all bacterial enumerations in the data sequence to be evaluated. (If a zero value is obtained, take the log₁₀ value of the minimum detection limit of the analytical method used instead.)
	(ii)	Calculate the arithmetic mean of the log₁₀ values (μ).
	(iii)	Calculate the standard deviation of the log₁₀ values (σ).
	The upper 90‑percentile point of the data probability density function is derived from the following equation: upper 90‑percentile = antilog (μ + 1,282 σ).
	The upper 95‑percentile point of the data probability density function is derived from the following equation: upper 95‑percentile = antilog (μ + 1,65 σ).