Chelsea, Quebec

Arsenic: 0 of 12 · Barium: 0 of 12 · Fluoride: 1 of 12 · Manganese: 1 of 12 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

0 of 12 sampled wells (0%) had a latest result above the Quebec standard of 0.01 mg/L.

Median (latest per well): 0 mg/L
90th percentile: 0 mg/L
Highest: 0 mg/L
Samples: 13, 2005-06-05 to 2011-08-11
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 12 sampled wells (0%) had a latest result above the Quebec standard of 1 mg/L.

Median (latest per well): 0.0905 mg/L
90th percentile: 0.36 mg/L
Highest: 0.46 mg/L
Samples: 13, 2005-06-05 to 2011-08-11
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

1 of 12 sampled wells (8%) had a latest result above the Quebec standard of 1.5 mg/L.

Median (latest per well): 0.7 mg/L
90th percentile: 1.5 mg/L
Highest: 3.4 mg/L
Samples: 13, 2005-06-05 to 2011-08-11
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 12 sampled wells (8%) had a latest result above the Quebec standard of 0.12 mg/L.

Median (latest per well): 0.037 mg/L
90th percentile: 0.08 mg/L
Highest: 0.21 mg/L
Samples: 14, 2005-06-05 to 2011-08-11
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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