Table 9: Final Human Health State of the Science Report on Lead

Table 9. Concentrations of lead (μg/L) in residential tap water in Canada
Sample location Year n % > 10 μg/L Concentration (μg/L) Reference
Median MinTable 9 footnote a MaxTable 9 footnote a

- not reported

Table 9 footnotes

Table 9 footnote a

Min: minimum; Max: maximum.

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Table 9 footnote b

No flushed sample protocol.

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Table 9 footnote c

Water collected after 30 minutes of stagnation.

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Table 9 footnote d

Homes with lead service lines.

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Table 9 footnote e

Flushed sample (5 minute).

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Table 9 footnote f

Homes without lead service lines.

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Table 9 footnote g

Composite sample.

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Table 9 footnote h

Water drawn upon entering home with no specified or known stagnation period.

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Table 9 footnote i

Values below the method detection limit (MDL) are reported as 0.

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Table 9 footnote j

Sampling 15 December 2007 to 15 April 2008 (cold water, winter sampling).

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Table 9 footnote k

Sampling 15 June to 15 October 2008 (warm water, summer sampling).

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Table 9 footnote l

Based on average of five 1L kitchen tap water samples collected per household. 1 L collected after 5 minute flush, four 1L sequential samples collected following 30 minutes of stagnation. Sampled September 2009 to March 2010 (fall sampling and winter (cold water) sampling). Approximately 56% of these households likely had lead service lines. Note: The column reporting % > 10 ug/L includes only samples collected after 5 minute flush.

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Table 9 footnote m

Average of maximum values

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Table 9 footnote n

From homes built prior to 1950

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British Columbia, First Nations reserves 2008-2009 568 0.5 - - 20.4 Chan et al. 2011
EdmontonTable 9 footnote b 2009 - - <0.5 - - EPCOR 2009
SaskatoonTable 9 footnote b 2009 8 0 <2 - - Saskatoon 2009
SaskatchewanTable 9 footnote b 2009 176 - 6.7 <0.1 60 Saskatchewan 2011
WinnipegTable 9 footnote b 2009 - - <1 <1 <1 Winnipeg 2009
OntarioTable 9 footnote c 2007/8Table 9 footnote j 37 517 2.3 Average: 2.0 - - OMOE 2009
2008Table 9 footnote k 37 895 3.1 Average: 1.9 - 491
HamiltonTable 9 footnote c 2009 634 8 - <1 97 Hamilton 2010
(North) HamiltonTable 9 footnote c 2008 - - - <0.5Table 9 footnote n 28Table 9 footnote n Richardson et al. 2011
WaterlooTable 9 footnote c 2009 121 0 - <1 4 Waterloo 2009
BarrieTable 9 footnote c 2009 512 0.2 - 0.11 23.9 Barrie 2010
KingstonTable 9 footnote c 2009 198 8 - <0.02 48.1 Kingston 2009
OttawaTable 9 footnote c 2009 264 4 - <0.5 38 Ottawa 2011
St. CatharinesTable 9 footnote c 2009 2 0 - <0.02 0.03 St. Catharines 2009
SudburyTable 9 footnote c 2009 790 0.5 - 1 17 Sudbury 2009
Thunder BayTable 9 footnote b 2009 454 21 - <1 1320 Thunder Bay 2009
MontréalTable 9 footnote d, Table 9 footnote e 2006 111 53 Average: 11 3 33 Beausoleil and Brodeur 2007
MontréalTable 9 footnote e, Table 9 footnote f 2006 19 - Average: 0.7 1 2.7
MontréalTable 9 footnote d, Table 9 footnote g 2006 111 - Average: 20 3 95Table 9 footnote m
MontréalTable 9 footnote e, Table 9 footnote f 2006 19 - Average: 1 0.3 7Table 9 footnote m
MontréalTable 9 footnote h 2007 135 - 14, dissolved Pb 2.1 114 Deshommes et al. 2010
2007 135 - 0.39, particulate Pb <0.02 12

MontréalTable 9 footnote l
(4 selected boroughs)

2009/10 313 1.6 (5 homes) 2.08 0.06 27.98 INSPQ 2011
Province of Quebec 2005 1009 0.7 2 1 20 Quebec 2011
2006 2220 0.3 3 1 90
2007 2573 0.8 5 1 370
2008 2649 0.4 3 0.5 45
2009 2730 0.5 2 0.2 530
2010 2678 0.6 2 0.06 154
Newfoundland and LabradorTable 9 footnote i 2005 839 0.4 <1.0 <1.0 46.0 Newfoundland and Labrador 2011
2006 1009 0.6 <1.0 <1.0 45.0
2007 817 0.6 <1.0 <1.0 43.0
2008 1148 0.6 0.20 <1.0 49.0
2009 1029 0.4 <1.0 <1.0 54.0
2010 489 0.2 <1.0 <1.0 52.0
St. John’s 2010 194 - 0.51e 0.11 e 19.1 e Bell et al. 2011
2010 194 - 0.84Table 9 footnote c 0.15Table 9 footnote c 58.2Table 9 footnote c
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