Table 1.

May 2021 ILA results as scaling factors between the 9 Obépine laboratories, in relation to one laboratory taken as reference (Lab 1). The number of WWTPs monitored and the LOQs reported by the laboratories are also indicated. Lab 7’s responsibilities did not include operational analyses for the monitored WWTPs.

	Lab 1	Lab 2	Lab 3	Lab 4	Lab 5	Lab 6	Lab 7	Lab 8	Lab 9
Scaling factor mean	1	0.95	1.20	1.96	3.96	10.64	0.40	6.50	1.12
Scaling factor std	0	0.31	0.34	0.54	0.74	9.00	0.077	2.62	0.43
Number of WWTPs	73	25	21	18	3	14	0	3	11
Quantifying technique	qPCR	qPCR	qPCR	qPCR	dPCR	qPCR	qPCR	qPCR	qPCR
LOQ (GU/L)	${1.10}^3$	${5.10}^3$	${5.10}^3$	$1,{1.10}^3$	$5,{5.10}^2$	${4.10}^4$	${1.10}^3$	${5.10}^3$	${4.10}^4$