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Guelph Drinking Water Quality
By OpenStats · Built from official Canadian sources
Direct municipal dataB
Water quality grade
Good
Graded against Health Canada drinking water guidelines
Lead within guidelinepH in range
Hardness vs provincial average460 mg/L · prov. avg 182 mg/L
Lead vs provincial average0.1 μg/L · prov. avg 0.4 μg/L
Hardness
460 mg/L
Lead
0.1 μg/L
≤ 5 μg/L
pH
7.2
6.5–8.5 range
Hardness
460 mg/L
Very hard
Lead
0.1 μg/L
Max: 5 μg/L
pH
7.2
6.5–8.5
Chlorine
0.6 mg/L
Max: 4 mg/L
From source to sink
Where Guelph water comes from
Lakes, rivers, wells, and treatment plants behind the kitchen tap, in plain language. Chemistry grades above are a separate lab snapshot; this section is the route the water travels.
Open the full tap storyOn the map
Where Guelph water lives
Source waters and treatment plants pinned from published utility names. Open a pin below for the full OpenStreetMap view.
- CityGuelph
Municipal service area
- Treatment plantF.M. Woods Water Treatment Plant
Approximate pin near Guelph (exact plant coordinates pending)
- Treatment plantDistributed well treatment and point-of-entry facilities
Approximate pin near Guelph (exact plant coordinates pending)
Map data © OpenStreetMap contributors. Pins are approximate for orientation, not legal survey points.
Where it starts
Groundwater
Research confidence: high
Named source waters
- Deep limestone/dolomite bedrock aquifers
- Arkell Spring Grounds / Glen Collector (shallow groundwater)
- Eramosa River (seasonal infiltration recharge only)
Treatment plants
F.M. Woods Water Treatment Plant
Primary plant receiving Arkell wells and Glen Collector water via the Arkell Aqueduct; supplies a large share of Zone 1 demand.
Distributed well treatment and point-of-entry facilities
About 19-22 operational municipal wells citywide plus the Glen Collector; treatment typically includes chlorination and, at selected sites, UV, iron sequestration, or manganese removal. Some sources are classified GUDI-WEF.
How it reaches your street
City-owned system with a 6.5 km large-diameter aqueduct, five underground reservoirs, three water towers, and roughly 560 km of watermains across three pressure zones.
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Best for hardness ≥ 180 mg/L
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Confirm mg/L before sizing a unit
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Partner
Lab water test for Guelph taps
Municipal reports cover the plant. A Tap Score kit tests the water at a Guelph tap for a broader contaminant panel.
Lab kit partner link. We may earn a commission when tracking is active.
Reading this page
Guelph's most recent drinking water sample (2026-07-22) reports hardness of 460 mg/L, classified as very hard, and pH 7.2, drawn from a groundwater water source and treated at Guelph Water Treatment Plant. Lead measured 0.1 μg/L and fluoride 0.6 mg/L.
Free chlorine measured 0.6 mg/L in this sample. No E. coli was detected in this sample.
Guelph's hardness of 460 mg/L is above the Ontario average of 182 mg/L across 51 tracked municipalities, with a provincial average pH of 7.5.
These readings summarize a single compliance snapshot, not a certification of the water reaching your tap. Test your own water periodically, especially on a private well, and consider a softener if hardness is classified hard or very hard.
How to use this page: read the headline metrics first, then where the water comes from (map and tap story), then the parameter table and source footer.
All monitored parameters meet Health Canada guidelines.
Health parameters compliant; minor aesthetic factors such as hardness or pH near guideline edges.
Figure 1 · From source to sink
How drinking water reaches your tap
Compared to provincial average
Ontario · 51 cities in sample
Hardness (city vs Ontario avg)460 mg/L
pH (city vs Ontario avg)7.2
Lead (city vs Ontario avg)0.1 μg/L
Fluoride (city vs Ontario avg)0.6 mg/L
Provincial average: hardness 182 mg/L · pH 7.5 · lead 0.4 μg/L · fluoride 0.6 mg/L
Full parameters
| Parameter | Reading | Health Canada guideline | Status |
|---|---|---|---|
| Hardness | 460 mg/L | No health limit (aesthetic) | Compliant |
| pH | 7.2 | 6.5–8.5 | Compliant |
| Lead | 0.1 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.6 mg/L | ≤ 1.5 mg/L | Compliant |
| Chlorine (free) | 0.6 mg/L | ≤ 4 mg/L | Compliant |
| Turbidity | 1 NTU | ≤ 1 NTU (typical target) | Compliant |
Alberta water licences
WaterRegister.ca
On a private well or holding an Alberta water allocation licence? Water Register maps EPA licence records, transfer comparables, and watershed context across the province.
Explore WaterRegister.ca →Water softeners for hard water
Very hard water. Whole-house softeners are the high-ticket fit; salt and test kits support the install.
As an Amazon Associate, OpenStats earns from qualifying purchases.
· Compare options- Shop on Amazon.caWhole-house water softenerBest for hardness ≥ 180 mg/L
- Shop on Amazon.caSoftener saltOngoing supply (high repurchase)
- Shop on Amazon.caWater descalerScale reduction without salt
- Shop on Amazon.caWater hardness test stripsConfirm mg/L before sizing a unit
- Shop on Amazon.caTDS meterQuick dissolved-solids check
Source · Region of Waterloo / City of Guelph water softener study. Last updated 2026-07-22. Refreshed on the site's automated schedule.