Saint-Mathieu-d'Harricana, Quebec

Arsenic: 3 of 22 · Barium: 0 of 22 · Fluoride: 0 of 22 · Manganese: 9 of 22 · Uranium: 1 of 16 sampled wells above the Quebec standard. Updated 2026-10-17. Source : PACES – Projets d'acquisition de connaissances sur les eaux souterraines (MELCCFP), compiled database.

What wells in this municipality measured in the provincial PACES groundwater surveys. A local picture only: test your own well to know your water.

Arsenic

3 of 22 sampled wells (14%) had a latest result above the Quebec standard of 0.01 mg/L.

Median (latest per well): 0.0005 mg/L
90th percentile: 0.0026 mg/L
Highest: 0.035 mg/L
Non-detects: 1 well(s) had a latest result of "not detected" with no detection limit reported; they are counted as below the standard.
Samples: 23, 2006-08-21 to 2011-11-04
Source: PACES – Projets d'acquisition de connaissances sur les eaux souterraines (MELCCFP), compiled database (CC-BY 4.0), downloaded 2026-10-17
Standard: Règlement sur la qualité de l’eau potable, annexe 1

Barium

0 of 22 sampled wells (0%) had a latest result above the Quebec standard of 1 mg/L.

Median (latest per well): 0.0055 mg/L
90th percentile: 0.022 mg/L
Highest: 0.053 mg/L
Samples: 23, 2006-08-21 to 2011-11-04
Source: PACES – Projets d'acquisition de connaissances sur les eaux souterraines (MELCCFP), compiled database (CC-BY 4.0), downloaded 2026-10-17
Standard: Règlement sur la qualité de l’eau potable, annexe 1

Fluoride

0 of 22 sampled wells (0%) had a latest result above the Quebec standard of 1.5 mg/L.

Median (latest per well): 0 mg/L
90th percentile: 0.11 mg/L
Highest: 0.7 mg/L
Non-detects: 1 well(s) had a latest result of "not detected" with no detection limit reported; they are counted as below the standard.
Samples: 23, 2006-08-21 to 2011-11-04
Source: PACES – Projets d'acquisition de connaissances sur les eaux souterraines (MELCCFP), compiled database (CC-BY 4.0), downloaded 2026-10-17
Standard: Règlement sur la qualité de l’eau potable, annexe 1

Manganese

9 of 22 sampled wells (41%) had a latest result above the Quebec standard of 0.12 mg/L.

Median (latest per well): 0.0525 mg/L
90th percentile: 0.47 mg/L
Highest: 0.57 mg/L
Samples: 23, 2006-08-21 to 2011-11-04
Source: PACES – Projets d'acquisition de connaissances sur les eaux souterraines (MELCCFP), compiled database (CC-BY 4.0), downloaded 2026-10-17
Standard: Règlement sur la qualité de l’eau potable, annexe 1

Uranium

1 of 16 sampled wells (6%) had a latest result above the Quebec standard of 0.02 mg/L.

Median (latest per well): 0 mg/L
90th percentile: 0.0011 mg/L
Highest: 0.071 mg/L
Non-detects: 1 well(s) had a latest result of "not detected" with no detection limit reported; they are counted as below the standard.
Samples: 16, 2009-08-25 to 2011-11-04
Source: PACES – Projets d'acquisition de connaissances sur les eaux souterraines (MELCCFP), compiled database (CC-BY 4.0), downloaded 2026-10-17
Standard: Règlement sur la qualité de l’eau potable, annexe 1

Includes domestic, municipal and monitoring wells. Total and dissolved results both count. Non-detects count only when the lab's detection limit is at or below the standard. Method: data rules.

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If a result is high: arsenic · manganese · uranium · all guides