Table 3.

Detection of SARS-CoV-2 RNA from raw sewage.

Date	Plant	Concentration factor	log10 Wa	SLOQ (copies/mL)	SARS-CoV-2
					CDC N1	CDC N2	CDC N3	NIID
June 30	D	160	−0.41	16.1	Neg	Neg	Neg	Neg
	E	149	−0.76	38.5	Neg	Neg	Neg	Neg
July 7	D	152	−0.79	40.6	Posb	Neg	Neg	Neg
	E	163	−0.65	27.5	Neg	Neg	Neg	Neg
July 16	D	152	0.04	6.0	Neg	Neg	Posc	Neg
	E	146	−0.29	13.2	Neg	Neg	Neg	Neg
July 22	D	159	−1.14	86.6	Neg	Neg	Neg	Neg
	E	160	−0.34	13.5	Neg	Neg	Neg	Neg
July 29	D	159	−0.36	14.3	Posd	Neg	Neg	Neg
	E	160	−0.26	11.3	Pose	Neg	Neg	Neg
August 5	D	154	−0.2	10.4	Neg	Neg	Neg	Neg
	E	154	−0.68	31.3	Neg	Neg	Neg	Neg

Neg: negative, Pos: positive.

^aWhole process recovery ratio (W) of φ6 was determined at n = 1 for each sample.

^bSARS-CoV-2 CDC N1 gene was positive; the Ct was 38.7 (in one of two PCR reactions).

^cSARS-CoV-2 CDC N3 gene was positive; Ct was 38.9 (in one of two PCR reactions).

^dSARS-CoV-2 CDC N1 gene was positive; the Ct was 40.9 (in one of two PCR reactions).

^eSARS-CoV-2 CDC N1 gene was positive; the Ct was 37.7 (in one of two PCR reactions).