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Velora Water: London Ontario Water Quality Overview

London Ontario Drinking Water Quality Overview – 2025

London receives its municipal drinking water primarily from Lake Huron through the Lake Huron Primary Water Supply System, with additional supply from the Elgin Area system (Lake Erie). The water meets all provincial standards with strong compliance. While safe, many London homeowners install premium filtration to improve taste, reduce hardness, and address potential issues from older plumbing.

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Quick Facts 

  • 100% Regulatory Compliance in 2025

  • Lake Huron Primary Source

  • ~420,000+ London Residents Served

  • ~100–130 mg/L Typical Hardness

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Water Source & Treatment

Source: Primarily Lake Huron via the Lake Huron Primary Water Supply System, with supplementary supply from the Elgin Area Water Treatment Plant (Lake Erie). The City of London maintains its extensive distribution system.

Treated water is supplied through regional systems and distributed by the City of London through a large network of pumping stations, reservoirs, and local mains.

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Velora Water Systems water quality summary and report for London, Ontario – municipal water analysis with hardness, chlorine, and contaminant levels plus recommended filtration solutions
Google Maps view of London, Ontario – service area for Velora Water Systems luxury residential and light commercial water filtration
Aerial view of London, Ontario looking over the city centre, Thames River, and surrounding residential neighbourhoods – Velora Water Systems service area for premium water filtration and softener systems
Heat map from this location showing Velora Water Systems outreach across its full Ontario service area and beyond, including supplier connections and regional coverage, go back from London to the Service Area Page

Parameters

Typical Level

Ontario Standards (MAC)

Notes:

PH

7.4 – 7.7

6.5 – 8.5

Optimal range

Total Hardness:

~125–130 mg/L

No MAC

Harder than Central Toronto

Calcium

35 - 38 mg/L

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Contributes to hardness

Sodium

15–18 mg/L

20 mg/L (AO)

Low:


suitable for most low-sodium diets

Lead (at treatment plant)

< 1 µg/L

5 µg/L

No lead added at plants

THMs (average)

< 50 µg/L

100 µg/L

Disinfection byproduct:


well below limit

Note: All regulated microbiological, chemical, and radiological parameters met Ontario Drinking Water Quality Standards in 2025.

Key Water Quality Parameters (2025)

  • pH: 7.4–7.7 (optimal)

  • Total Hardness: ~80–120 mg/L (moderately soft to moderately hard)

  • Calcium: ~25–35 mg/L

  • Sodium: Low

  • Lead (at source): <1 µg/L (no lead added at treatment)

  • THMs: Well below provincial limits

All regulated parameters met Ontario Drinking Water Quality Standards.

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Lead Service Lines & Older Plumbing

Treated water contains no lead. Older homes in London may have lead service lines or pre-1990 solder. The City of London participates in lead sampling and replacement programs. Free testing is available.

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Common Resident Concerns

  • Chlorine taste and odour

  • Seasonal organic/algae-related flavours

  • Hard water scale and dry skin/hair

  • Trace organics and emerging contaminants

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Why London Homeowners Choose Velora Filtration

  • Superior taste and clarity

  • Water softening for healthier skin, hair, and longer-lasting appliances

  • Extra protection against trace contaminants and distribution variability

  • Whole-home benefits for showers, laundry, and plumbing

  • Peace of mind for families in both older neighbourhoods and newer subdivisions across London

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Book A Free In-Home Water Analysis!

Velora Water (Vaughan) specializes in custom whole-home and reverse osmosis systems tailored to London water conditions.

www.velorawater.com — Serving London and Southwestern Ontario

We offer:

  • Whole-home filtration systems

  • Reverse osmosis drinking water systems

  • Water softeners and conditioners

  • Iron, tannin, and specialty filters

  • UV disinfection

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Disclaimer

Summarizes official 2025 London reports. Tap water quality can vary by home. Professional on-site testing recommended.

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