Saint-Hyacinthe, Quebec

Fluoride: 2 of 12 · Manganese: 1 of 10 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.

Fluoride

2 of 12 sampled wells (17%) had a latest result above the Quebec standard of 1.5 mg/L.

Median (latest per well): 0.45 mg/L
90th percentile: 1 mg/L
Highest: Withheld for review: 1 well(s) had a result above 15 mg/L, far outside the usual range. They are still counted as above the standard.
Samples: 12, 1969-04-01 to 2010-07-16
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

1 of 10 sampled wells (10%) had a latest result above the Quebec standard of 0.12 mg/L.

Median (latest per well): 0.05 mg/L
90th percentile: 0.07 mg/L
Highest: 0.53 mg/L
Samples: 10, 1974-07-02 to 2010-07-16
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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