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Document ID ca-gcdwqgtd-2017-01-04-8 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-5-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 13:03:03.406831+00:00 Relevance Technical document providing the health basis for drinking water standards.

Q Qualitative Requirements (0)

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P Quantitative Requirements (8)

Req ID Category Intent Legal Status Name Subdomain(s) Limit Type Limit Value Context Conditions Confidence
#P001chemicalhealthguidanceChlorpyrifos NOAEL (red blood cell and brain cholinesterase inhibition)drinking waterunknown0.1 mg/kg bw per dayBased on these results, the no-observed-adverse-effect level (NOAEL) for red blood cell and brain cholinesterase inhibition is considered to be 0.1 mg/kg bw per day.Rats fed diets containing chlorpyrifos for two yearsmedium
#P002chemicalhealthguidelineChlorpyrifos NOAEL (red blood cell and brain cholinesterase inhibition)drinking waterunknown0.1 mg/kg bw per dayBased on these results, the no-observed-adverse-effect level (NOAEL) for red blood cell and brain cholinesterase inhibition is considered to be 0.1 mg/kg bw per day.Beagle dogs and rats fed diets containing chlorpyrifos for two yearshigh
#P003chemicalhealthguidelineNOAEL in Rhesus monkeysdrinking waterunknown0.08 mg/kg bw per dayThe NOAEL in Rhesus monkeys receiving 0.08 mg/kg bw per day of chlorpyrifos by gavage for six months was similar; animals exhibited no depression in red blood cell cholinesterase activity.Rhesus monkeys receiving chlorpyrifos by gavage for six monthshigh
#P004chemicalhealthguidelineShort-term Human NOAEL (red blood cell cholinesterase)drinking waterunknown0.10 mg/kg bw per dayHuman volunteers (four men per group) were administered oral doses of chlorpyrifos... Red blood cell cholinesterase activity was not affected at any level.Human volunteers administered oral doses for nine dayshigh
#P005chemicalhealthguidelineCarcinogenicity NOAEL (CD-1 mouse)drinking waterunknown1.5 mg/kg bw per dayIn a carcinogenicity study in CD-1 mice, chlorpyrifos was not oncogenic when administered at dose levels up to 15 ppm (1.5 mg/kg bw per day) in food for 105 weeks.Administered in food for 105 weekshigh
#P006chemicalhealthguidelineTeratogenicity threshold (CF-1 mouse)drinking waterunknown25 mg/kg bw per dayIn a CF-1 mouse teratogenicity study, chlorpyrifos was not teratogenic at doses up to 25 mg/kg bw per dayTeratogenicity studyhigh
#P007chemicalhealthguidelineMaternal cholinesterase reduction threshold (CF-1 mouse)drinking waterunknown>= 1 mg/kg bw per daysignificant reductions in plasma and erythrocyte cholinesterase levels were observed in maternal mice at 1 mg/kg bw per day or greaterMaternal mice during teratogenicity studyhigh
#P008chemicalhealthguidelineFoetal cholinesterase reduction threshold (CF-1 mouse)drinking waterunknown>= 10 mg/kg bw per daysignificant reductions in plasma and erythrocyte cholinesterase levels were observed in foetuses at 10 mg/kg bw per day or moreFoetuses during teratogenicity studyhigh

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