739 samples, standard-grown
2018 · United States · USDA Pesticide Data Program · Calendar year
Pesticide residues found on wheat flour
73.3% of standard-grown samples had at least one detected residue. Standard-grown means samples not identified as organic (called conventional in the source data). Detection does not, by itself, mean the food was unsafe.
All reported results below quantification
Two or more residues detected
Highest observed count: 6
Compared with the recorded EPA tolerance
19 samples, interpret cautiously
Annual context
How monitored results changed
Each row is a separate targeted survey. Samples can differ by retailer, origin and season, so this is context rather than a trend claim.
Residue detail
What was found on wheat flour?
The most frequently detected residues across all 758 samples. This is the complete available table for this monitoring entry.
758samples checked
Detection does not establish harm. Health risk depends on both toxicity and the amount a person is exposed to.
What do these types mean?
- FungicideControls fungal diseases such as moulds and mildews.
- InsecticideControls insects that damage crops or stored food.
- HerbicideControls weeds competing with a crop.
- Growth regulatorChanges plant growth, development or ripening.
- Other / mixedCovers multiple substances or a role that cannot be reliably assigned from the published name.
These labels describe agricultural function, not a toxicity ranking.
| Residue | Type | Samples | Median | Higher result | Typical published limit |
|---|---|---|---|---|---|
| Deltamethrin (includes parent Tralomethrin) | Other / mixed | 400 (52.8%) | 0.006 mg/kg | 0.053 mg/kg | 1 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Piperonyl butoxide | Other / mixed | 231 (30.5%) | 0.061 mg/kg | 0.49 mg/kg | 20 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Malathion | Other / mixed | 186 (24.5%) | 0.004 mg/kg | 0.025 mg/kg | 8 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Chlorpyrifos methyl | Other / mixed | 166 (21.9%) | 0.005 mg/kg | 0.043 mg/kg | 6 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Bifenthrin | Insecticide | 19 (2.5%) | 0.002 mg/kg | 0.004 mg/kg | 0.05 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| MGK-264 | Other / mixed | 18 (2.4%) | 0.003 mg/kg | 0.009 mg/kg | 5 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Cyhalothrin, Total (Cyhalothrin-L + R157836 epimer) | Other / mixed | 12 (1.6%) | 0.009 mg/kg | 0.02 mg/kg | 0.05 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Chlorpyrifos | Other / mixed | 9 (1.2%) | 0.003 mg/kg | 0.007 mg/kg | 0.5 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Chlorpropham | Herbicide | 6 (0.8%) | 0.002 mg/kg | 0.003 mg/kg | 0.000 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Pyriproxyfen | Other / mixed | 5 (0.7%) | 0.002 mg/kg | 0.007 mg/kg | 1.1 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Pentachlorobenzene (PCB) | Other / mixed | 5 (0.7%) | 0.003 mg/kg | 0.005 mg/kg | 0.000 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Imidacloprid | Insecticide | 4 (0.5%) | 0.004 mg/kg | 0.006 mg/kg | 0.05 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Malathion oxygen analog | Other / mixed | 4 (0.5%) | 0.002 mg/kg | 0.01 mg/kg | 8 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Pirimiphos methyl | Other / mixed | 3 (0.4%) | 0.005 mg/kg | 0.009 mg/kg | 0.000 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Fluopyram | Fungicide | 3 (0.4%) | 0.002 mg/kg | 0.002 mg/kg | 4 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Spinosad | Other / mixed | 3 (0.4%) | 0.006 mg/kg | 0.033 mg/kg | 1.5 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Methoxychlor p,p' | Other / mixed | 2 (0.3%) | 0.002 mg/kg | 0.002 mg/kg | 0.000 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| Thiabendazole | Fungicide | 1 (0.1%) | 0.004 mg/kg | 0.004 mg/kg | 0.05 mg/kg |
Reviewed evidence What regulators assessed: The long-term guidance value was based on body-weight suppression and nephrosis observed in an animal study at higher doses. Reference values
Reviewed from WHO/FAO JMPR, 2019 ↗ | |||||
| Difenoconazole | Fungicide | 1 (0.1%) | 0.002 mg/kg | 0.002 mg/kg | 0.1 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
| DDT p,p' | Other / mixed | 1 (0.1%) | 0.002 mg/kg | 0.002 mg/kg | 0.5 mg/kg |
Health summary pending No reviewed substance-specific summary is available, so no health effect is inferred. Search WHO/FAO JMPR ↗ | |||||
“Higher result” is an approximate 95th-percentile observed concentration, not a safety threshold. Amounts of different pesticides should not be added together or compared directly. Functional types describe their usual agricultural role; they are not hazard or toxicity rankings.
ADI and ARfD are intake reference values, not limits for one food sample. A personal assessment would also require consumption, body-weight and wider exposure data. Source programmes report legal Maximum Residue Level results separately.
What this tells you
A monitoring result, not a verdict.
USDA PDP selects rotating commodities, with emphasis on foods important to consumer diets, including foods eaten by infants and children. It is not a test of every wheat flour product sold in United States. This entry’s latest included calendar year release is from 2018.
Comparable annual records are available for 2018, 2004, 2003.
Published MRLs or tolerances are regulatory limits associated with pesticide use. Consumer-risk assessment is a separate process.
Broader sample coverage. At least 50 samples: broader monitoring coverage, but still targeted rather than random.
Compare organic and standard-grown results →Common questions
How to read these wheat flour results
Were pesticide residues detected on wheat flour?
73.3% of 739 standard-grown samples in the 2018 USDA Pesticide Data Program dataset had at least one quantified residue.
Does that mean wheat flour were unsafe?
No. A laboratory detection is not, by itself, a consumer-risk finding. Regulators assess dietary risk separately.
Should I buy organic wheat flour?
The monitored organic samples had a 0% detection rate, compared with 73.3% for standard-grown samples. This is a shopping-priority comparison, not a health-risk score.