Water Quality Reports - Decew

The Decew Falls Water Treatment Plant provides water to St. Catharines and portion of Thorold, Lincoln and Niagara-on-the-Lake.

Current Status

The values below represent the water quality leaving the water treatment plant on the date indicated with the exception of pH which is for distribution water.

These values are updated on a monthly basis and measured by a laboratory that is certified by the Ministry of Environment, Conservation and Parks.

ParameterValueSample DateRangeTarget in Range
Alkalinity85 mg/LMarch 3, 202530 - 500 mg/LTarget in range Safe and within our expected range
Hardness105 mg/LMarch 3, 2025100 - 150 mg/LTarget in range Safe and within our expected range
pH7.54 April 4, 20256.5-8.5Target in range Safe and within our expected range
E. ColiNot detectedMarch 24, 20250 counts/100 mLTarget in range Safe and within our expected range
Total ColiformsNot detectedMarch 24, 20250 counts/100 mLTarget in range Safe and within our expected range
LeadNot detectedFeb. 5, 20250-0.01 mg/LTarget in range Safe and within our expected range
Chloride30.6 mg/LMarch 3, 20250 - 250 mg/LTarget in range Safe and within our expected range
Sodium13.2 mg/LFeb. 5, 20250-20 mg/LTarget in range Safe and within our expected range
Sulphate36.9 mg/LMarch 3, 20250 - 500 mg/LTarget in range Safe and within our expected range
FluorideNot detectedMarch 3, 20250 - 1.5 mg/LTarget in range Safe and within our expected range
Vinyl ChlorideNot detectedFeb. 5, 20250-0.001 mg/LTarget in range Safe and within our expected range
Calcium28.8 mg/LMarch 3, 2025 No current standards or guidelines for this parameter
Magnesium8 mg/LMarch 3, 2025 No current standards or guidelines for this parameter

For more information about the quality of water in your local distribution system, contact your area municipality.

Reports

Under Ontario Regulation 170/03, Niagara Region and the area municipalities are responsible for providing water quality reports.

2024

2023

2022

2021

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