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Table 1 Descriptive statistics for THM concentration (μg/L) in SWC and HWC water supplies, 1995 to 2001 1

From: Colon and rectal cancer incidence and water trihalomethane concentrations in New South Wales, Australia

Region Statistics Chloroform Bromoform2 BDCM DBCM TTHM
Sydney water corporation (n = 45) Mean 37.3 2.86 16.9 6.93 64.0
SD 24.0 2.87 5.32 3.34 29.8
Median 33.2 2 17.3 5.5 66.1
IQR 22.9 1.2 5.6 3.1 30.1
Range 8.5 to 201 0.67 to 17.8 6.66 to 45.0 0.67 to 27.7 20.5 to 234
Hunter water corporation (n = 5)3 Mean 42.7 1.76 14.7 7.25 66.4
SD 13.1 1.11 5.26 6.15 11.4
Median 39.8 2.0 17.3 5.5 66.4
IQR 22.2 1.3 5.6 3.2 29.0
Range 23.3 to 65.0 0.67 to 3.95 5.64 to 24.8 1.06 to 21.9 36.7 to 81.3
Both areas combined (n = 50) Mean 37.7 2.8 16.7 7.0 66.4
SD 23.4 2.8 5.3 3.6 28.9
Median 34.4 2.0 17.3 5.5 66.4
IQR 22.2 1.3 5.6 3.2 29.0
Range 8.5 to 201.2 0.67 to 17.8 5.6 to 45.0 0.67 to 27.7 20.5 to 234.3
  1. 1Means, standard deviations and range of THM concentrations across LGAs for SWC and HWC.
  2. 2SWC: 18.7% of values were below the detection limit in 1995–1998 and 63.6% from 1999 onwards. HWC: 51% of values were below the detection limit.
  3. 3HWC data available from 1997 to 2001.