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Table 1 THM levels (μg/L) by sampling site, water supply zone, year and season of sampling

From: Individual exposures to drinking water trihalomethanes, low birth weight and small for gestational age risk: a prospective Kaunas cohort study

Tap water sampling TTHMscMean (SDd) CHCl3Mean (SD) CHBr2Cl Mean (SD) CHBrCl2Mean (SD)
Sampling sites     
All sites 9.8 (12.4) 7.8 (10.2) 0.3 (0.5) 1.7 (2.2)
Low THM levela 1.3 (1.2) 0.9 (1.0) 0.1 (0.2) 0.3 (0.5)
High THM levelb 21.9 (10.9) 17.7 (9.0) 0.5 (0.6) 3.6 (2.1)
Year of sampling     
2007 all sites 10.3 (13.5) 8.7 (12.0) 0 (0 e) 1.5 (1.6)
Low THM levela 0.9 (1.3) 0.39 (1.0) 0 (0) 0.6 (0.5)
High THM levelb 24.2 (11.0) 21.3 (9.6) 0 (0) 2.9 (1.7)
2008 all sites 6.2 (10.2) 4.4 (7.5) 0.3 (0.5) 1.5 (2.4)
Low THM levela 1.5 (1.1) 0.9 (0.6) 0.2 (0.3) 0.5 (0.5)
High THM levelb 12.7 (13.5) 9.3 (9.8) 0.6 (0.6) 2.8 (3.3)
2009 all sites 11.8 (12.8) 9.5 (10.0) 0.4 (0.5) 1.9 (2.3)
Low THM levela 1.3 (1.1) 1.3 (1.0) 0.1 (0.2) 0.1 (0.2)
High THM levelb 26.5 (2.9) 21.0 (2.3) 0.9 (0.4) 4.6 (0.5)
Season of sampling     
Spring all sites 8.5 (12.1) 6.8 (9.7) 0.3 (0.4) 1.4 (2.1)
Low THM levela 1.4 (1.3) 1.2 (1.1) 0.1 (0.3) 0.2 (0.4)
High THM levelb 18.3 (13.6) 14.7 (10.9) 0.5 (0.5) 3.1 (2.3)
Summer all sites 9.9 (12.7) 8.3 (11.3) 0 (0) 1.6 (1.7)
Low THM levela 1.0 (1.4) 0.4 (1.0) 0 (0) 0.7 (0.5)
High THM levelb 24.1 (8.3) 21.0 (7.0) 0 (0) 3.1 (2.0)
Autumn all sites 11.1 (13.4) 8.8 (11.1) 0.2 (0.5) 2.0 (2.4)
Low THM levela 1.2 (1.1) 0.8 (0.9) 0 (0) 0.4 (0.5)
High THM levelb 24.8 (9.7) 20.1 (8.6) 0.6 (0.6) 4.2 (2.4)
Winter all sites 10.9 (12.1) 8.4 (9.3) 0.5 (0.6) 1.9 (9.3)
Low THM levela 1.1 (1.0) 0.9 (0.6) 0.1 (0.3) 0.1 (0.3)
High THM levelb 24.5 (1.4) 18.9 (1.2) 1.1 (0.1) 4.5 (0.2)
  1. aViciunai, Eiguliai, Kleboniskis. bPetrasiunai.
  2. cTTHMs = total trihalomethanes: the sum of CHCl3 (chloroform),
  3. CHBr2Cl (dibromochloromethane), and CHBrCl2 (bromodichloromethane).
  4. dSD = standard deviation. e0 = below the limit of detection.