The Water Quality Advisory, which has been in place for City of Cranbrook water customers since April 9, was officially lifted effective Friday, May 2.

Turbidity levels have been sitting at about 1 NTU since April 9, 2025, but testing over the past 48 hours confirms that the turbidity levels in Phillips Reservoir have dropped below 1 NTU allowing the Water Quality Advisory to be lifted.

Turbidity is a measure of water clarity or how much matter is suspended in the water, like soil particles.

Increased turbidity can make it harder for the chlorination to do its job. Turbidity, which occurs when there is run-off from snow melt and rain events, is common when you are dealing with a surface water system like the city is with the Phillips Reservoir.

This increase in turbidity is likely because of the transition to spring weather encouraging a fast lake turnover which has stirred up sediment.

Both the City of Cranbrook and Interior Health Authority appreciate the patience and understanding of those impacted by this Water Quality Advisory.

Find more information about water quality and the city’s overall water system.

City of Cranbrook

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