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21-WQ-Streams_summary-maps-new

This is a composite image with 6 maps showing the levels of chloride, nitrates and total phosphorus in Ontario stream stations versus thresholds over two time periods (2003-2007 and 2008-2012). The majority of stations are in the Mixedwood Plains Ecozone with a few scattered in the southern portion of the Ontario Shield. Patterns are similar for all three parameters for both time periods. Most stations are below choride thresholds with the exception of urban areas. Most stations in extreme southwestern Ontario are above nitrate thresholds. About half of the stations are above total phosphorus thresholds and these are equally distributed across the province.