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Document ID ca-gcdwqgtd-2017-01-04-9 Title Guidelines for Canadian Drinking Water Quality: Guideline Technical Document – Chlorpyrifos URL https://www.canada.ca/en/health-canada/services/publications/healthy-living/guidelines-canadian-drinking-water-quality-guideline-technical-document-chlorpyrifos/page-6-guidelines-canadian-drinking-water-quality-guideline-technical-document-chlorpyrifos.html Jurisdiction /ca Subdomain(s) Drinking water Language en Status completed Analyzed at 2026-03-18 13:05:46.993160+00:00 Relevance Defines the maximum acceptable concentration for chlorpyrifos in drinking water.

Q Qualitative Requirements (0)

No qualitative requirements.

P Quantitative Requirements (7)

Req ID Category Intent Legal Status Name Subdomain(s) Limit Type Limit Value Context Conditions Confidence
#P001chemicalhealthguidelinechlorpyrifosdrinking waterMAC0.09 mg/LThe maximum acceptable concentration (MAC) for chlorpyrifos in drinking water is derived from the ADI as follows: MAC = 0.01 mg/kg bw per day × 70 kg × 0.20 / 1.5 L/d ≈ 0.09 mg/Lhigh
#P002chemicalhealthguidelinechlorpyrifos (ADI)drinking waterrequirement0.01 mg/kg bw per dayThe ADI for chlorpyrifos has been derived by the Food and Agriculture Organization (FAO) and the World Health Organization (WHO) as follows: ADI = 0.1 mg/kg bw per day / 10 = 0.01 mg/kg bw per dayDerived by FAO/WHO using an uncertainty factor of 10high
#P003chemicalhealthguidelinechlorpyrifos (NOAEL)drinking waterunknown0.1 mg/kg bw per day0.1 mg/kg bw per day is the NOAEL derived from two-year studies in the dog and rat and studies with human volunteersDerived from two-year studies in the dog and rat and studies with human volunteershigh
#P004designoperationalguidelineaverage body weight (adult)drinking waterrequirement70 kg70 kg is the average body weight of an adultUsed for MAC derivationhigh
#P005designoperationalguidelineaverage daily consumption of drinking water (adult)drinking waterrequirement1.5 L/d1.5 L/d is the average daily consumption of drinking water for an adult.Used for MAC derivationhigh
#P006designoperationalguidelineproportion of daily intake allocated to drinking waterdrinking waterrequirement0.20 dimensionless0.20 is the proportion of daily intake of chlorpyrifos allocated to drinking waterUsed for MAC derivationhigh
#P007designoperationalguidelineuncertainty factordrinking waterrequirement10 dimensionless10 is the uncertainty factor.Used for ADI derivationhigh

D Definitions (0)

No definitions.