Fire Hydrant colours/coding
City hydrant standard colour is yellow. Fire Hydrant tops and caps can be one of four colours, each hydrant top and cap colour represents the flow of water in gallons per minute. The majority of caps are blue. Colour coding is performed as per Ontario Fire Code.
Original Article Source Credits: Toronto , https://www.toronto.ca/
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Link to Original Article: https://www.toronto.ca/311/knowledgebase/kb/docs/articles/toronto-water/district-operations/program-maintenance/fire-hydrant-colourscoding.html