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Field Inquiries

NCCEH field inquiries are based on a real or hypothetical situation related to an environmental health problem. A field inquiry uses a question format to offer context and background to the problem, knowledge to assess the situation and concludes with an approach to solve the problem.

Irrigating Food Crops with Water Containing Cyanobacteria Blooms

Primary inquiry: Small horticulture growers have been watering their crops with surface water containing a cyanobacterial bloom, before selling their crops at local markets. Can irrigation of food crops using surface water affected by cyanobacteria blooms result in bioaccumulation of cyanotoxins in these crops? Can cyanotoxins bioaccumulate to a concentration that might cause a public health...

PDF icon Irrigating_Food_Crops_Water_Containing_Cyanobacteria-Oct_2017.pdf

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Pool Chlorination and Closure Guidelines

Topics: Recreational Water, Water Location: General, Canada 

As an EH director at a local health authority, helping to review provincial guidelines on swimming pools, you want to know if scientific evidence supports pool closure orders when free available chlorine (FAC) is found to be at or above 10 ppm. Should the level be different and are there other factors to be considered for closure, instead of or in addition to FAC? What is Free Available Chlorine...

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