Water Quality - WHO Drinking Water Guidelines, Table 2C: Pesticides

C. Pesticides

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Guideline
value (µg/litre)

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Remarks

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/alachlorsum.htm">alachlor

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20b

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For excess
risk of 10-5

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/aldicarbsum.htm">aldicarb

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10

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/aldrindieldrinsum.htm">aldrin/dieldrin

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0.03

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/atrazinesum.htm">atrazine

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2

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/bentazonesum.htm">bentazone

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300

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/carbofuransum.htm">carbofuran

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7

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/chlordanesum.htm">chlordane

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0.2

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/chlorotoluronsum.htm">chlorotoluron

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30

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/cyanazinesum.htm">cyanazine

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0.6

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/ddtsum.htm">DDT

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2

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/dbcpsum.htm">1,2-dibromo-3-chloropropane

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1b

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For excess
risk of 10-5

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/12dibromoethanesum.htm">1,2-dibromoethane

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0.4–15b
(P)

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For excess
risk of 10-5

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/24dichlorophenosum.htm">2,4-dichlorophenoxyacetic
acid (2,4-D)

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30

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/12dichloropropsum.htm">1,2-dichloropropane
(1,2-DCP)

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40 (P)

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/13dichloropropsum.htm">1,3-dichloropropane

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NAD

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/13dichloropropenesum.htm">1,3-dichloropropene

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20b

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For excess
risk of 10-5

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/diquatsum.htm">diquat

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10 (P)

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/heptasum.htm">heptachlor
and heptachlor epoxide

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0.03

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/hexachlorobenzsum.htm">hexachlorobenzene

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1b

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For excess
risk of 10-5

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/isoproturonsum.htm">isoproturon

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9

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/lindanesum.htm">lindane

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2

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/mcpasum.htm">MCPA

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2

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/methoxychlorsum.htm">methoxychlor

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20

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/metolachorsum.htm">metolachlor

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10

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/molinatesum.htm">molinate

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6

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/pendimethalinsum.htm">pendimethalin

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20

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/pentachlorophenolsum.htm">pentachlorophenol

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9b
(P)

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For excess
risk of 10-5

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/permethrinsum.htm">permethrin

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20

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/propanilsum.htm">propanil

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20

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/pyridatesum.htm">pyridate

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100

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/simazinesum.htm">simazine

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2

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/terbuthylazinesum.htm">terbuthylazine


(TBA)

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7

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/trifluralinsum.htm">trifluralin

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20

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Chlorophenoxy
herbicides other than 2,4-D and MCPA

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/chlorophenoxysum.htm#2,4-DB">2,4-DB

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90

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/chlorophenoxysum.htm#Dichlorprop">dichlorprop

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100

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/chlorophenoxysum.htm#Fenoprop">fenoprop

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9

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/chlorophenoxysum.htm#MCPB">MCPB

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NAD

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/chlorophenoxysum.htm#Mecoprop">mecoprop

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10

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href="http://www.who.int/water_sanitation_health/GDWQ/Chemicals/chlorophenoxysum.htm#2,4,5-T">2,4,5-T

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9

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a (P) — Provisional guideline value. This term is used for
constituents for which there is some evidence of a potential hazard but where
the available information on health effects is limited; or where an uncertainty
factor greater than 1000 has been used in the derivation of the tolerable daily
intake (TDI). Provisional guideline values are also recommended: (1) for
substances for which the calculated guideline value would be below the
practical quantification level, or below the level that can be achieved through
practical treatment methods; or (2) where disinfection is likely to result in
the guideline value being exceeded.

b For substances that are considered to be carcinogenic, the
guideline value is the concentration in drinking-water associated with an
excess lifetime cancer risk of 10-5 (one additional cancer per
100 000 of the population ingesting drinking-water containing the
substance at the guideline value for 70 years). Concentrations associated with
estimated excess lifetime cancer risks of 10-4 and 10-6
can be calculated by multiplying and dividing, respectively, the guideline
value by 10.

In cases in which the concentration associated with an excess lifetime
cancer risk of 10-5 is not feasible as a result of inadequate
analytical or treatment technology, a provisional guideline value is
recommended at a practicable level and the estimated associated excess lifetime
cancer risk presented.

It should be emphasized that the guideline values for carcinogenic substances
have been computed from hypothetical mathematical models that cannot be
verified experimentally and that the values should be interpreted differently
from TDI-based values because of the lack of precision of the models. At best,
these values must be regarded as rough estimates of cancer risk. However, the
models used are conservative and probably err on the side of caution. Moderate
short-term exposure to levels exceeding the guideline value for carcinogens
does not significantly affect the risk.

c NAD — No adequate data to permit recommendation of a
health-based guideline value.

d ATO — Concentrations of the substance at or below the
health-based guideline value may affect the appearance, taste, or odour of the water.

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