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You can find practice-specific water quality results from STEP-associated projects over a 25-year period (1997 - 2021). Additional results will be added to this database on an ongoing basis. Click on any of the LID BMPs below to see how the removal efficiencies of these practices compares to the CWQG requirements for [[Phosphorus]] and [[TSS]]
→Nutrients
MANAGEMENT POLICIES GUIDELINES - PROVINCIAL WATER QUALITY OBJECTIVES OF THE MINISTRY OF ENVIRONMENT AND ENERGY. July, 1994. Reprinted February 1999. ISBN 0-7778-8473-9 rev. https://dr6j45jk9xcmk.cloudfront.net/documents/3016/moeprovincialwaterqualityobjectivesen.pdf</ref>]]
MANAGEMENT POLICIES GUIDELINES - PROVINCIAL WATER QUALITY OBJECTIVES OF THE MINISTRY OF ENVIRONMENT AND ENERGY. July, 1994. Reprinted February 1999. ISBN 0-7778-8473-9 rev. https://dr6j45jk9xcmk.cloudfront.net/documents/3016/moeprovincialwaterqualityobjectivesen.pdf</ref>]]
===Practice-specific Water Quality===
===STEP stormwater practice effluent quality monitoring results===
The whisker plot figures show effluent stormwater effluent quality monitoring results from STEP monitoring projects over a 25-year period (1997 - 2021) for sites within Greater Toronto Area regions and municipalities. Median concentrations of Total Suspended Solids (TSS) in untreated stormwater and oil and grit separator (OGS) outlet locations were found to typically exceed 30 mg/L. Median TSS concentrations at stormwater detention pond and chamber system outlet locations was found to be below 30 mg/L, but exceeded the guideline value in 36% of the monitored storm events. Median TSS concentrations at bioretention, permeable pavement and infiltration trench outlet locations were all below 30 mg/L. TSS concentration in effluent from bioretention was found to exceed 30 mg/L in only 15% of the monitored storm events, and in only 12% of monitored events for permeable pavements.
Click on the links below for LID BMP-specific pages and figures.
*[[Bioretention: Performances|Bioretention: Performance]]
*[[Bioretention: Performances|Bioretention: Performance]]