Stoneham-et-Tewkesbury, Quebec

Arsenic: 0 of 48 · Barium: 0 of 48 · Fluoride: 3 of 48 · Manganese: 0 of 19 · Uranium: 0 of 15 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 48 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
Non-detects: 48 well(s) had a latest result of "not detected" with no detection limit reported; they are counted as below the standard.
Samples: 51, 2002-01-19 to 2012-10-01
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 48 sampled wells (0%) had a latest result above the Quebec standard of 1 mg/L.

Median (latest per well): 0 mg/L
90th percentile: 0.0055 mg/L
Highest: 0.2577 mg/L
Non-detects: 37 well(s) had a latest result of "not detected" with no detection limit reported; they are counted as below the standard.
Samples: 51, 2002-01-19 to 2012-10-01
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

3 of 48 sampled wells (6%) had a latest result above the Quebec standard of 1.5 mg/L.

Median (latest per well): 0.115 mg/L
90th percentile: 0.66 mg/L
Highest: 2 mg/L
Non-detects: 3 well(s) had a latest result of "not detected" with no detection limit reported; they are counted as below the standard.
Samples: 52, 2002-01-19 to 2012-10-01
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

0 of 19 sampled wells (0%) had a latest result above the Quebec standard of 0.12 mg/L.

Median (latest per well): 0.0043 mg/L
90th percentile: 0.05 mg/L
Highest: 0.0567 mg/L
Non-detects: 6 well(s) had a latest result of "not detected" with no detection limit reported; they are counted as below the standard.
Samples: 25, 2002-01-19 to 2012-06-26
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

0 of 15 sampled wells (0%) had a latest result above the Quebec standard of 0.02 mg/L.

Median (latest per well): 0 mg/L
90th percentile: 0.0022 mg/L
Highest: 0.0077 mg/L
Non-detects: 11 well(s) had a latest result of "not detected" with no detection limit reported; they are counted as below the standard.
Samples: 15, 2003-05-08 to 2012-06-26
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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