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Document ID ca-on-or4emel-2021-06-11 Title O. Reg. 459/21: EFFLUENT MONITORING AND EFFLUENT LIMITS - INDUSTRIAL MINERALS SECTOR URL https://www.ontario.ca/laws/regulation/r21459 Jurisdiction /ca/on Subdomain(s) none Language Status completed Analyzed at 2026-05-12 03:45:26.920288+00:00 Relevance inventory_targeted_fetch

Q Qualitative Requirements (0)

No qualitative requirements.

P Quantitative Requirements (5)

Req ID Category Intent Legal Status Name Subdomain(s) Limit Type Limit Value Context Conditions Confidence
#R001designoperationalmandatoryPrivate sewer residential properties limitwastewaterrequirement<= 5 residential propertiesPrivate sewers servicing residential properties that discharge to a municipal sewer service connectionMust discharge to a municipal sewer service connectionhigh
#R002chemicaloperationalmandatoryNitrogen oxides emission limit for stop log liftersotherrequirement< 9.2 grams per kWhEquipment (e.g., stop log lifters) that uses propane or natural gas used to manage water levels by adding or removing logs at a damApplies to equipment using propane or natural gas at dams defined under the Lakes and Rivers Improvement Acthigh
#R003operationaloperationalmandatoryFoundation drainage water taking daily limitotherrequirement<= 379000 litres per dayFoundation drainage systems that are used to maintain dry building foundationsRequirement for exemption from requiring a Permit to Take Water (PTTW)high
#R004designoperationalmandatorySanitary sewage pumping station lot limitwastewaterrequirement1 lot or parcel of landSanitary sewage pumping stations serving one lot or parcel of land that discharge to a sanitary sewerMust discharge to a sanitary sewer for exemption eligibilityhigh
#R005designoperationalmandatoryStormwater management works lot limitwastewaterrequirement1 lot or parcel of non-industrial landStorm water management works that is designed to service one lot or parcel of non-industrial landIncludes discharge to a conveyance ditchhigh

D Definitions (59)

Req ID Category Name Context Confidence
#D001EROEnvironmental Registry of Ontariohigh
#D002Cumulative impactsthe combined effect of numerous single developments.high
#D003deleterious substanceAny substance with a potentially harmful chemical, physical (including temperature) or biological effect on fish or fish habitathigh
#D004Enhanced protectioncorresponds to the end-of-pipe storage volumes required for the long-term average removal of 80% of suspended solids.high
#D005Normal protectioncorresponds to the end-of-pipe storage volumes required for the long-term average removal of 70% of suspended solids.high
#D006Basic protectioncorresponds to the end-of-pipe storage volumes required for the long-term average removal of 60% of suspended solids.high
#D007active channelthat part of the channel which conveys the dry weather flow and flow from frequent precipitation events.high
#D008erosive forcesforces tending to dislodge and transport boundary materials and they are related to the volume and rate at which sediment and water are delivered to the stream.high
#D009bankfull flow stagewhen water fills the active channel without spilling out onto the floodplain.high
#D010first orderEach fingertip, or headwater channel, is designated as a segment of the first order.high
#D011MTOMinistry of Transportationhigh
#D012MOEMinistry of the Environmenthigh
#D013SWMPStormwater Management Practiceshigh
#D014SSSuspended Solidshigh
#D015SCSSoil Conservation Servicehigh
#D016SWMStormwater Managementhigh
#D017SWAMPStormwater Assessment and Monitoring Performancehigh
#D018DRCDistributed Runoff Controlhigh
#D019SIStability Indexhigh
#D020RGARapid Geomorphic Assessmenthigh
#D021ANSIArea of Natural or Scientific Interesthigh
#D022ESAEnvironmentally Sensitive Areahigh
#D023LODLarge Organic Debrishigh
#D024active storage componentthat portion of a facility that drains after an eventhigh
#D025Habitat compensationtypically involves the replacing of damaged habitat with newly created habitat or improving the productive capacity of other aquatic habitat at or near the area of impact.high
#D026long-term average suspended solids removalsrefer to the removal by the SWM facility of suspended solids from the site runoff for the entire range of rainfall events on that site for a long period of time, at least 10 years.high
#D027thalwegthe deepest point in a channel’s cross- sectionhigh
#D028TPtotal phosphorushigh
#D029CDACatchment Drainage Areahigh
#D030BFLBankfullhigh
#D031Entrenchment Ratioprovides an indication of the flow conveyance capacity of the active channel.high
#D032Stability Index ValueA stable stream has an innate ability to absorb a certain amount of change in the sediment-flow regime before the threshold of adjustment is reached.high
#D033mmmillimetreshigh
#D034hahectarehigh
#D035cubic metreshigh
#D036m³/hacubic metres per hectarehigh
#D037E.Escherichiahigh
#D038DEVdevelopmenthigh
#D039km²squared kilometreshigh
#D040m³/scubic metres per secondhigh
#D041m³/s/hacubic metres per second per hectarehigh
#D042mmetreshigh
#D043m/kmmetres per kilometrehigh
#D044water surplusexcess of precipitation over evapotranspirationhigh
#D045Hybrid Wet Pond/Wetland systemshave 50-60% of their permanent pool volume in deeper portions of the facility (e.g., forebay, wet pond).high
#D046infiltration factordetermined by summing a factor for topography, soils and cover.high
#D047n/anot applicablehigh
#D048overcontrolControlling post-development peak flow rates through storage to values less than pre-development conditionshigh
#D049i.e.that ishigh
#D050e.g.for examplehigh
#D051etcand so onhigh
#D052<less thanhigh
#D053less than or equal tohigh
#D054greater than or equal tohigh
#D055CDADEVCatchment Drainage Area of the Developmenthigh
#D056TEntrenchment Ratiohigh
#D057DBFLBankfull Depthhigh
#D058Distributed Runoff Control (DRC)The preservation of the balance between the erosive and resisting forces about the channel perimeter such that the stream is just able to move its sediment load.high
#D059headwater channelEach fingertip, or headwater channel, is designated as a segment of the first order.high