Table 4. Summary statistics for E. coli and enterococci concentrations estimated using IDEXX Colilert and Enterolert, Median [5th; 95th]. n is the number of samples, with [>dl] being the number of samples greater than the detection limit indicated.

The water quality assessment category was estimated using NHMRC Guidelines for Managing Risks in Recreational Water Quality [22]. The % exceedance and the long-term water quality assessment were based on SEPP values [1, 2] for fresh and marine water.

	Summary statistics					Comparison to guidelines [% exceedance]
					NHMRC	SEPP for Yarra Catchment		SEPP for Port Phillip Bay
					water-quality	[E. coli orgs/100 mL]		[enterococci orgs/100 mL]
Site	E. coli [MPN/100 mL]	n [>dl]	enterococci [MPN/100 mL]	n [>dl]	assessment category	Primary [>150]	Secondary [>1000]	[>200]	[>400]
YER	141	16 [16]	-	-	-	50	0	-	-
	[79, 429]
WAR	131	23	-	-	-	13	0	-	-
	[53, 409]
DFS	201	34 [34]	52	13 [13]	D	59	18	-	-
	[60, 2760]		[20, 508]
MOR	270	34 [34]	286	13 [13]	D	79	15	-	-
	[98, 6020]		[136, 1337]
ELW	-	-	20	47 [31]	C	-	-	131	92
			[<10, 446]
FRA	-	-	15	48 [35]	D	-	-	151	102
			[<10, 995]
RYE	-	-	20	31 [22]	D	-	-	131	102
			[<10, 656]

¹ Geometric mean over the monitoring period was <200 orgs/100 mL, the first long-term objective for bacteriological indicators in the SEPP for Port Phillip Bay.

² 80th-percentile over the testing period was <400 orgs/100 mL, the second long-term objective for bacteriological indicators in the SEPP for Port Phillip Bay.