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Velora Water: Expert Filtration & Softening for Markham Ontario

City of Markham Drinking Water Quality Overview

Markham receives its drinking water through the York Water System, primarily sourced from Lake Ontario. The water meets all provincial standards with 100% compliance. While safe, many Markham homeowners install advanced filtration to improve taste, reduce hardness, and address potential issues from older plumbing.

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Quick Facts 

  • 100% Regulatory Compliance in 2025

  • York Water System Primary Supply

  • ~350,000+ Markham Residents Served

  • ~125–130 mg/L Typical Hardness

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Water Source & Treatment

Source: Lake Ontario via the York Water System (York DWS). Water is treated at major plants in Toronto and Peel Region before being distributed to Markham.

Markham operates its own local pumping stations and distribution mains as part of the broader York Region network.

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Professional one-page water quality report for the City of Markham, Ontario. Created by Velora Water, it details 2025 official York Water System data including Lake Ontario source, typical hardness of 125–130 mg/L, risks from older lead plumbing, common taste and scale concerns, and the benefits of custom whole-home and reverse osmosis filtration systems tailored for Markham residents.
Google Maps location of Velora Water serving Markham Ontario – premium water filtration systems and free in-home water testing for Markham and York Region residents.
Peaceful Markham residential community where Velora Water helps families enjoy cleaner, scale-free water throughout their homes with professional filtration and softening 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 Markham 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.

Lead Service Lines & Older Plumbing in Markham

Treated water contains no lead. However, homes built before the mid-1950s may have lead service pipes, and pre-1990 homes may have lead solder. Markham participates in York Region lead sampling and replacement programs. Free testing kits are available.

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Common Residential Concern

  • Chlorine/chloramine taste and odour

  • Seasonal earthy/musty flavours from Lake Ontario algae

  • Hard water scale, dry skin/hair, and appliance buildup (common in Markham at 125–130 mg/L)

  • Trace organics and emerging contaminants

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Why Markham 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 established and newer neighbourhoods

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Book A Free In-Home Water Analysis!

Protect Your Family’s Water — Book a Free In-Home Water Analysis

Velora Water (Vaughan) specializes in custom whole-home and reverse osmosis systems tailored to Markham / York Region water.

www.velorawater.com — Serving Markham, Vaughan, and the GTA

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 York Region / Markham reports. Tap water quality can vary by home. Professional on-site testing recommended.

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