Sponsored
Drinking water filters and test kits
Pitcher and under-sink filters, plus hardness strips and TDS meters for tap checks.
Sarnia Drinking Water Quality
By OpenStats · Built from official Canadian sources
Regional estimateA
Water quality grade
Excellent
Graded against Health Canada drinking water guidelines
Lead within guidelinepH in range
Hardness vs provincial average162 mg/L · prov. avg 182 mg/L
Lead vs provincial average0.2 μg/L · prov. avg 0.4 μg/L
Hardness
162 mg/L
Lead
0.2 μg/L
≤ 5 μg/L
pH
8
6.5–8.5 range
Hardness
162 mg/L
Hard
Lead
0.2 μg/L
Max: 5 μg/L
pH
8
6.5–8.5
Chlorine
0.7 mg/L
Max: 4 mg/L
From source to sink
Where Sarnia 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 Sarnia water lives
Source waters and treatment plants pinned from published utility names. Open a pin below for the full OpenStreetMap view.
- CitySarnia
Municipal service area
- Source waterLake Huron
Source water
- Treatment plantLambton Area Water Supply System (LAWSS) Water Treatment Plant
Approximate pin near Sarnia (exact plant coordinates pending)
Map data © OpenStreetMap contributors. Pins are approximate for orientation, not legal survey points.
Where it starts
Surface water
Research confidence: high
Named source waters
- Lake Huron
Treatment plants
Lambton Area Water Supply System (LAWSS) Water Treatment Plant
Regional plant at the Lake Huron outlet into the St. Clair River (Point Edward / Sarnia area). Intake sits above the Sarnia industrial complex. Jointly owned by Sarnia and neighbouring Lambton municipalities.
How it reaches your street
LAWSS treats and transmits water to Sarnia, Point Edward, St. Clair Township, Warwick, Plympton-Wyoming, Lambton Shores and other customers; Sarnia operates local distribution within the city.
SponsoredAlso consider
Water filter pitcher
Popular everyday tap filter
SponsoredAlso consider
Brita replacement filters
Recurring purchase
SponsoredAlso consider
Under-sink water filter
Higher capacity drinking water
SponsoredAlso consider
Reverse osmosis system
High-ticket under-sink upgrade
As an Amazon Associate, OpenStats earns from qualifying purchases.
Partner
Lab water test for Sarnia taps
Municipal reports cover the plant. A Tap Score kit tests the water at a Sarnia tap for a broader contaminant panel.
Lab kit partner link. We may earn a commission when tracking is active.
Partner
Waterdrop filtration systems
Under-sink and RO systems from Waterdrop Canada — a direct brand alternative to marketplace filters.
Waterdrop affiliate link. We may earn a commission.
Reading this page
Sarnia's most recent drinking water sample (2026-07-22) reports hardness of 162 mg/L, classified as hard, and pH 8, drawn from a surface water source and treated at Sarnia Water Treatment Plant. Lead measured 0.2 μg/L and fluoride 0.5 mg/L.
Free chlorine measured 0.7 mg/L in this sample. No E. coli was detected in this sample.
Sarnia's hardness of 162 mg/L is below 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.
All health parameters meet Health Canada guidelines with comfortable pH, hardness, and turbidity.
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)162 mg/L
pH (city vs Ontario avg)8
Lead (city vs Ontario avg)0.2 μg/L
Fluoride (city vs Ontario avg)0.5 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 | 162 mg/L | No health limit (aesthetic) | Compliant |
| pH | 8 | 6.5–8.5 | Compliant |
| Lead | 0.2 μg/L | ≤ 5 μg/L | Compliant |
| Fluoride | 0.5 mg/L | ≤ 1.5 mg/L | Compliant |
| Chlorine (free) | 0.7 mg/L | ≤ 4 mg/L | Compliant |
| Turbidity | 0.3 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 →Drinking water filters and test kits
Pitcher and under-sink filters, plus hardness strips and TDS meters for tap checks.
As an Amazon Associate, OpenStats earns from qualifying purchases.
· Compare options- Shop on Amazon.caWater filter pitcherPopular everyday tap filter
- Shop on Amazon.caBrita replacement filtersRecurring purchase
- Shop on Amazon.caUnder-sink water filterHigher capacity drinking water
- Shop on Amazon.caReverse osmosis systemHigh-ticket under-sink upgrade
- Shop on Amazon.caShower filterChlorine at the showerhead
- Shop on Amazon.caWater test kitLead, pH, and hardness spot-check
- Shop on Amazon.caTDS meterQuick dissolved-solids readout
- Shop on Amazon.caWater hardness test stripsQuick tap reading
Source · ECCC / municipal open data (seed). Last updated 2026-07-22. Refreshed on the site's automated schedule.