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[[File:TP_effluent_comparison.png|thumb|600px|Under the Provincial Water Quality Objectives set out by the Ministry of Environment and Energy in 1994, Total phosphorus effluent leaving a SWM facility should be below a concentration level of 30 μg/L. (0.03 mg/L) (MOEE 1994)<ref>Ministry of the Environment and Energy. 1994. WATER
[[File:TP_effluent_comparison.png|thumb|600px|Under the Provincial Water Quality Objectives set out by the Ministry of Environment and Energy in 1994, Total phosphorus effluent leaving a SWM facility should be below a concentration level of 30 μg/L. (0.03 mg/L) (MOEE 1994)<ref>Ministry of the Environment and Energy. 1994. WATER
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>]]
[[File:STEPTSSTPsummarystats2022.png|thumb|600px|STEP Database Summary Statistics, Total Suspended Solids and Total Phosphorus concentrations, 2022.]]
===STEP stormwater practice effluent quality monitoring results===
===STEP stormwater practice effluent quality monitoring results===
The box plot figures to the right show stormwater effluent quality monitoring results from STEP monitoring projects conducted over a 25-year time period (between 1997 and 2021) at sites within Greater Toronto Area municipalities.<br>
The box plot figures to the right show stormwater effluent quality monitoring results from STEP monitoring projects conducted over a 25-year time period (between 1997 and 2021) at sites within Greater Toronto Area municipalities.<br>