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Rankings and map of wastewater spills in Quebec

Rankings and map of wastewater spills in Quebec

A tool to understand the scale of wastewater spills

The Wastewater Discharge Index presents the annual ranking of municipalities, from worst to best, according to the intensity of discharges per capita. Les déversements refers to untreated water discharged into rivers.

This exercise makes it possible to distinguish municipalities which have improved since the previous year from those where the situation has deteriorated, and to encourage elected officials to correct the problems. The ranking is made from the map of wastewater spills.

Ranking of cities and municipalities according to the spill intensity index per capita

Comparez les villes et municipalités selon leur taille (petite, moyenne ou grande). Seules les municipalités de plus de 2000 habitants apparaissent dans le palmarès pour un total de 726 municipalités. 

carteRankMunicipalityRegionIntensité/Hab 2024Nb déversementsDébordements par temps sec (interdit)Dépassements de normes par temps de pluieNb ouvragesQuality of the measurementDérivations
1Map264Les Îles-de-la-MadeleineGaspésie--Îles-de-la-Madeleine0,010,71601314A+0Medium734
3Map276PerforatedGaspésie--Îles-de-la-Madeleine000006N / A1Small0
5Map15Grande-RivièreGaspésie--Îles-de-la-Madeleine16,657,16616189AT0Small57060
6Map11ChandlerGaspésie--Îles-de-la-Madeleine21,1314,436704832A+24Small314419
7Map276Port-Daniel--GasconsGaspésie--Îles-de-la-Madeleine000004N / AN / ASmall0
10Map51GaspeGaspésie--Îles-de-la-Madeleine6,4289,245701226AT0Medium289194
24Map84Sainte-Anne-des-MontsGaspésie--Îles-de-la-Madeleine3,421,2994016A+0Small21247
33Map12PaspébiacGaspésie--Îles-de-la-Madeleine19,159,31040013AT0Small59254
35Map73BonaventureGaspésie--Îles-de-la-Madeleine3,910,621004A+0Small10598
40Map21New RichmondGaspésie--Îles-de-la-Madeleine12,345,6420011A+0Small45610
44Map276mariaGaspésie--Îles-de-la-Madeleine000003N / AN / ASmall0
45Map173Carleton-sur-MerGaspésie--Îles-de-la-Madeleine0,682,727029AT0Small2739
62Map276CausapscalLower St. Lawrence000008N / AN / ASmall0
67Map256AmquiLower St. Lawrence0,040,240010A+0Small232
92Map129MataneLower St. Lawrence1,252,72470027A+0Medium52651
111Map235Mont JoliLower St. Lawrence0,121,74008A+0Small1717
113Map276Sainte LuceLower St. Lawrence000008N / AN / ASmall0
121Map142Saint-Anaclet-de-LessardLower St. Lawrence1,13,38002A+0Small3311
122Map171RimouskiLower St. Lawrence0,7139,45030040AT0Medium139363
135Map267Three pistolsLower St. Lawrence0,0101014A+0Small42
143Map276Saint AntoninLower St. Lawrence000005N / AN / ASmall0
152Map61Rivière-du-LoupLower St. Lawrence5,51103311421A+0Medium110008
156Map28ThawsLower St. Lawrence10,559,244028F0Small59236
168Map164Témiscouata-sur-le-LacLower St. Lawrence0,777,6650513A+0Small7611
173Map165PohénégamookLower St. Lawrence0,771,9310016A+0Small1923
177Map276St. PascalLower St. Lawrence000003N / AN / ASmall0
180Map242Saint-Alexandre-de-KamouraskaLower St. Lawrence0,10,21002A+0Small219
190Map125La PocatièreLower St. Lawrence1,58,333076A+0Small8289
196Map157La MalbaieNational Capital0,8921,8650522A+0Small21805
199Map276ClermontNational Capital000004N / AN / ASmall0
205Map276Baie-Saint-PaulNational Capital000005N / AN / ASmall0
213Map276Saint PamphileChaudière-Appalaches000003N / AN / ASmall0
224Map183Saint-Jean-Port-JoliChaudière-Appalaches0,551,94007A+0Small1896
225Map138L'IsletChaudière-Appalaches1,14,313015A+0Small4337
234Map248Cap Saint IgnaceChaudière-Appalaches0,080,34006A+0Small260
235Map133MontmagnyChaudière-Appalaches1,213,1570413A+0Medium13103
250Map233St. ClairChaudière-Appalaches0,120,46004AT0Small433
251Map276Saint AnselmeChaudière-Appalaches000007N / AN / ASmall0
252Map255Saint-HenriChaudière-Appalaches0,040,23006A+0Small230
254Map276Saint GervaisChaudière-Appalaches000001N / AN / ASmall0
255Map216Saint-RaphaëlChaudière-Appalaches0,240,615003A+0Small559
257Map5Saint-Charles-de-BellechasseChaudière-Appalaches27,267,985083A+0Small67891
258Map253BeaumontChaudière-Appalaches0,060,418006A+0Small350
266Map276Saint-Pierre-de-l'Île-d'OrléansNational Capital000000N / AN / ASmall0
270Map209Saint-Ferréol-les-NeigesNational Capital0,294,4160012AT2Small4430
273Map223BeaupréNational Capital0,161,98007AT2Small1861
274Map227Sainte-Anne-de-BeaupréNational Capital0,142110013AT2Small2000
276Map199L'Ange-GardienNational Capital0,377,1321026A+0Small7129
277Map202BoischatelNational Capital0,367,1321022A+0Small7129
281Map274Sainte-Catherine-de-la-Jacques-CartierNational Capital00,12009A+0Small50
287Map276Stoneham-and-TewkesburyNational Capital000001N / AN / ASmall0
288Map276Lac BeauportNational Capital000000N / AN / ASmall0
289Map212Sainte-Brigitte-de-LavalNational Capital0,262,14005A+0Small2102
292Map161QuebecNational Capital0,85963,2168923174232AT129Large963158
296Map170Levi'sChaudière-Appalaches0,71834,71133346103AT223Large834688
300Map276Saint-ElzéarChaudière-Appalaches000002N / AN / ASmall0
301Map106Sainte MarieChaudière-Appalaches2,229,328008A+0Medium29335
304Map276ScottChaudière-Appalaches000009N / AN / ASmall0
305Map250Saint BernardChaudière-Appalaches0,070,27006A+0Small183
306Map276St. IsidoreChaudière-Appalaches000002N / AN / ASmall0
307Map195Saint-Lambert-de-LauzonChaudière-Appalaches0,392,717009A+0Small2671
309Map237St. VictorChaudière-Appalaches0,110,310005A+0Small278
311Map35BeaucevilleChaudière-Appalaches8,654,210811312A+0Small54227
313Map155Saint-Joseph-de-BeauceChaudière-Appalaches0,916,19094A+0Small6119
321Map166St. ProsperChaudière-Appalaches0,722,68002A+0Small2585
327Map263Lac-EtcheminChaudière-Appalaches0,010,24027A+0Small167
333Map181Saint-Gédéon-de-BeauceChaudière-Appalaches0,571,29002A+0Small1223
338Map276Saint-MartinChaudière-Appalaches000002N / AN / ASmall0
340Map228Saint-Côme--LinièreChaudière-Appalaches0,140,46003A+0Small444
342Map131Saint GeorgesChaudière-Appalaches1,280,4770212A+5Medium80414
345Map177Saint-Éphrem-de-BeauceChaudière-Appalaches0,631,519086A+0Small1492
353Map239Megantic lakeEstrie0,110,67004A+0Small608
377Map265AdstockChaudière-Appalaches0,010,13002A+0Small65
379Map17Thetford MinesChaudière-Appalaches16,5849,61214066129A+0Medium849589
383Map95East BroughtonChaudière-Appalaches2,86,1180103A+0Small6060
387Map276St. FerdinandCentre-du-Québec000003N / AN / ASmall0
389Map196princevilleCentre-du-Québec0,372,36008A+0Small2320
391Map114PlessisvilleCentre-du-Québec1,74,555008A+0Small4547
402Map276Saint-GillesChaudière-Appalaches000003N / AN / ASmall0
404Map146Saint AgapitChaudière-Appalaches14,513002A+0Small4465
406Map276Laurier StationChaudière-Appalaches000006N / AN / ASmall0
411Map176Saint ApollinaireChaudière-Appalaches0,634,54003A+2Small4453
413Map262Holy CrossChaudière-Appalaches0,0104015A+0Small37
417Map276NeuvilleNational Capital000006N / AN / ASmall0
418Map219Red BridgeNational Capital0,185,518102619A+0Small5457
419Map39DonnaconaNational Capital8,360,61620411A+0Small60618
420Map136Cap-SantéNational Capital1,2429009A+0Small4028
421Map71St. BasilNational Capital410,6105117A+0Small10631
422Map276PortneufNational Capital000009N / AN / ASmall0
423Map272Deschambault-GrondinesNational Capital001002A+0Small20
425Map232Saint-Marc-des-CarrièresNational Capital0,120,4191111A+0Small366
433Map184Saint RaymondNational Capital0,556,526006A+0Medium6524
443Map2St. TiteMauricie65,3241,4476007A+0Small241369
447Map54Sainte-ThècleMauricie6,215,128002A+0Small15071
454Map101ShawiniganMauricie2,4585,1164946878A+0Medium585116
456Map116Trois-RivièresMauricie1,61133,9105341764A+3Large1133851
462Map151Saint MauriceMauricie0,943,216001A+0Small3201
469Map206BécancourCentre-du-Québec0,3217,43101216VS0Medium17436
490Map59VictoriavilleCentre-du-Québec5,8276,76600134A+0Medium276669
491Map159WarwickCentre-du-Québec0,884,210044AT0Small4186
500Map276DaveluyvilleCentre-du-Québec000005N / AN / ASmall0
508Map152Val-des-SourcesEstrie0,946,46012AT0Small6410
509Map87DanvilleEstrie3,212,220003B0Small12164
514Map160Cookshire EatonEstrie0,8513,947028E0Small13919
515Map269Ascot CornerEstrie0,0103005A+0Small41
516Map75East AngusEstrie3,914,81440713A+0Small14757
522Map163WeedonEstrie0,844,448007A+0Small4423
524Map276stokeEstrie000001N / AN / ASmall0
525Map127Saint-François-Xavier-de-BromptonEstrie1,33,210004A+0Small3156
526Map270Saint-Denis-de-BromptonEstrie0,010,12011A+0Small67
537Map102WindsorEstrie2,316,41231012AT0Small16378
539Map67richmondEstrie4,113,5700111A+2Small13486
543Map148SherbrookeEstrie1834,215260110147AT112Large834207
549Map186CoaticookEstrie0,488,5219616816A+0Small8533
554Map271ComptonEstrie001004A+0Small16
555Map230WatervilleEstrie0,130,33002A+0Small281
564Map276Sainte-Catherine-de-HatleyEstrie000000N / AN / ASmall0
565Map145MagogEstrie155,722412123B366Medium55749
568Map276EastmanEstrie000003N / AN / ASmall0
572Map276OrfordEstrie000005N / AN / ASmall0
581Map276dunhamMontérégie000001N / AN / ASmall0
582Map276suttonMontérégie000002N / AN / ASmall0
585Map273Lac-BromeMontérégie00,120014A+0Small67
586Map153BromontMontérégie0,9218,8300310A+0Medium18803
587Map26CowansvilleMontérégie11194970024A+0Medium193955
589Map34BrighamMontérégie8,71941000026A+0Small193992
593Map13FarnhamMontérégie17,1163,9108008A+0Small163907
595Map226Saint-Alphonse-de-GranbyMontérégie0,140,913003A+0Small915
596Map72GranbyMontérégie4271,22330522A+0Medium271227
597Map45WaterlooMontérégie7,333,9280011A+0Small33861
599Map276SheffordMontérégie000001N / AN / ASmall0
601Map218Roxton PondMontérégie0,180,82014F0Small755
607Map121Acton ValeMontérégie1,6121231229A+0Small12023
608Map111UptonMontérégie24,343056A+0Small4250
616Map276WickhamCentre-du-Québec000001N / AN / ASmall0
617Map276Saint-Germain-de-GranthamCentre-du-Québec000001N / AN / ASmall0
618Map77DrummondvilleCentre-du-Québec3,8297,757503076A+0Medium297671
619Map251Saint-Cyrille-de-WendoverCentre-du-Québec0,070,75004A+0Small682
635Map93Saint-Léonard-d'AstonCentre-du-Québec2,86,942004A+0Small6923
639Map30NicoletCentre-du-Québec9,479,11820810A+0Small79127
644Map198PierrevilleCentre-du-Québec0,371,628002A+0Small1618
647Map217MaskinongéMauricie0,20,513002A+0Small473
648Map48LouisevilleMauricie6,949,31660514A+0Small49290
649Map168YamachicheMauricie0,712,117055A+0Small2053
658Map112Saint-Alexis-des-MontsMauricie1,95,526003A+0Small5464
662Map276St. BonifaceMauricie000001N / AN / ASmall0
663Map266Saint-Étienne-des-GrèsMauricie0,010,13002A+0Small51
665Map83LavaltrieLanaudière3,448,4503228A+0Medium48384
666Map126LanoraieLanaudière1,47,120002A+0Small7124
668Map3BerthiervilleLanaudière37,5163560416B0Small162997
670Map276Saint-Ignace-de-LoyolaLanaudière000003N / AN / ASmall0
672Map201Saint-BarthélemyLanaudière0,360,72013A+0Small726
677Map49Saint-Gabriel-de-BrandonLanaudière6,617,622003A+0Small17631
685Map180Sainte-Victoire-de-SorelMontérégie0,581,45001A+0Small1425
687Map275Saint-Roch-de-RichelieuMontérégie001005A+0Small5
689Map24Sorel TracyMontérégie11,3841,719241196058AT0Medium841689
690Map40Sainte-Anne-de-SorelMontérégie8335,258063121AT0Small335176
694Map147St. PiusMontérégie15,849006A+0Small5751
695Map7St. DamaseMontérégie24,561,7111052A+8Small61729
696Map225St. MagdaleneMontérégie0,151,11002A+0Small1092
697Map244Sainte-Marie-MadeleineMontérégie0,10,811163A+0Small777
698Map128La PrésentationMontérégie1,33,150024A+0Small3122
699Map60Saint HyacintheMontérégie5,7645,3109104549A+0Medium645319
700Map178Saint DominicMontérégie0,621,610056A+0Small1605
702Map276St. LiboireMontérégie000001N / AN / ASmall0
711Map276Guardian AngelMontérégie000004N / AN / ASmall0
712Map276Saint-Paul-d'AbbotsfordMontérégie000001N / AN / ASmall0
713Map100Saint-CésaireMontérégie2,435,366006AT0Small35315
715Map98RougemontMontérégie2,428,147003A+0Small28126
716Map63MarievilleMontérégie5,3594020614AT12Medium59046
717Map23RichelieuMontérégie11,563170004AT0Small63023
718Map243Saint-Mathias-sur-RichelieuMontérégie0,10,410007A+0Small443
722Map69GlueMontérégie410,712004A+0Small10661
724Map276Saint-Paul-de-l'Île-aux-NoixMontérégie000000N / AN / ASmall0
727Map207St. AlexanderMontérégie0,310,84002A+0Small798
728Map16Sainte-Anne-de-SabrevoisMontérégie16,61697,6142606058A+19Small1697637
729Map276Saint-Blaise-sur-RichelieuMontérégie000000N / AN / ASmall0
730Map36Saint-Jean-sur-RichelieuMontérégie8,61697,7142906055A+19Medium1697743
731Map268Mont-Saint-GrégoireMontérégie0,0101004A+0Small29
733Map105ChamblyMontérégie2,371,136005AT0Medium71078
734Map192CarignanMontérégie0,424,62022AT0Medium4628
735Map97Saint-Basile-le-GrandMontérégie2,7165,252105A+0Medium165159
736Map81McMastervilleMontérégie3,5104,42067AT0Small104350
737Map4Otterburn ParkMontérégie35472,5112063AT0Small472536
738Map117Saint Jean BaptistMontérégie1,65,222004A+0Small5216
739Map8Mont-Saint-HilaireMontérégie22,1603,81940620AT0Medium603818
740Map19BeloeilMontérégie14,24257080629AT0Medium424976
741Map247Saint-Mathieu-de-BeloeilMontérégie0,080,22026A+0Small224
742Map276Saint-Marc-sur-RichelieuMontérégie000004N / AN / ASmall0
744Map208Saint-Denis-sur-RichelieuMontérégie0,31,919005A+0Small1905
746Map9BrossardMontérégie21,53214,77703723AT97Medium3214713
747Map74St. LambertMontérégie3,982012803713AT97Medium819988
748Map33BouchervilleMontérégie8,9385,218203722AT97Medium385204
749Map66Saint-Bruno-de-MontarvilleMontérégie4,2298,9120008A+0Medium298942
750Map18LongueuilMontérégie14,95352,540203731AT97Large5352450
751Map174Sainte-JulieMontérégie0,6720,18016A+0Medium20123
752Map249Saint AmableMontérégie0,0813027A+0Medium972
753Map52VarennesMontérégie6,3135,777299A+0Medium135699
754Map65VerchèresMontérégie4,526,1720147A+0Small26134
756Map38ContrecoeurMontérégie8,475,1158058AT0Small75059
757Map229CharlemagneLanaudière0,1315,8200517AT0Small15802
758Map172RepentignyLanaudière0,7140,412901041B1Medium140390
759Map210Saint SulpiceLanaudière0,2813034A+0Small957
760Map197The AssumptionLanaudière0,3768,610601740AT0Medium68563
761Map89L'ÉpiphanieLanaudière326,71100329A+0Small26741
763Map47St.PaulLanaudière7422,715752910AT0Small422683
764Map130CrabtreeLanaudière1,2568058AT59Small5000
766Map57JolietteLanaudière6455,233452914A+0Medium455235
767Map246St. ThomasLanaudière0,090,31011F0Small301
768Map50Notre-Dame-des-PrairiesLanaudière6,6422,31525257A+0Small422253
769Map55Saint-Charles-BorroméeLanaudière6,1422,81535267AT0Medium422787
770Map276Saint-Ambroise-de-KildareLanaudière000003N / AN / ASmall0
771Map44Our Lady of LourdesLanaudière7,4422,31545276A+0Small422300
772Map276Sainte-MélanieLanaudière000000N / AN / ASmall0
774Map276Saint-Félix-de-ValoisLanaudière000002N / AN / ASmall0
775Map182Saint-Jean-de-MathaLanaudière0,562,526401A+0Small2526
776Map276Sainte-BeatrixLanaudière000004N / AN / ASmall0
777Map276Saint-Alphonse-RodriguezLanaudière000000N / AN / ASmall0
779Map175RawdonLanaudière0,677,670056A+0Medium7594
780Map276ChertseyLanaudière000004N / AN / ASmall0
783Map276Saint DonatLanaudière000001N / AN / ASmall0
784Map276Saint-CômeLanaudière000001N / AN / ASmall0
786Map276St. DamianLanaudière000000N / AN / ASmall0
788Map276Saint-Michel-des-SaintsLanaudière000003N / AN / ASmall0
804Map86Saint JacquesLanaudière3,213,2124304A+0Small13247
806Map29Holy SpiritLanaudière10,320,823013AT0Small20781
807Map80Saint-Roch-de-l'AchiganLanaudière3,638,5621501A+0Small38502
809Map92Saint-Lin--LaurentidesLanaudière2,864,5150005A+0Medium64514
810Map149St. CallistusLanaudière16,333024A+0Small6284
811Map258Sainte-JulienneLanaudière0,030,318023A+0Medium290
812Map276Saint-LiguoriLanaudière000000N / AN / ASmall0
813Map99TerrebonneLanaudière2,4291,942201157AT2Large291928
814Map150MascoucheLanaudière155,53700749AT2Medium55460
815Map96LavalLaval2,73619,319456847152AT198Large3619270
817Map118MontrealMontreal1,66163,71584277149AT0Large6163677
834Map200Saint-MathieuMontérégie0,364,3170114B0Small4280
835Map215Saint-PhilippeMontérégie0,242,39042A+0Small2292
836Map20The MeadowMontérégie14,1963,71050975AT55Medium963740
837Map46CandiacMontérégie7688,5310993AT55Medium688484
838Map70DelsonMontérégie4276,1210997AT55Small276142
839Map42Saint CatherineMontérégie7,6597,5330974AT55Medium597517
840Map31St. ConstantMontérégie9,2912,5580975AT55Medium912540
841Map260St. IsidoreMontérégie0,020,11014A+0Small60
842Map62MercierMontérégie5,578,260683A+0Medium78177
843Map85ChateauguayMontérégie3,2162,15381627A+12Medium162136
844Map276LeryMontérégie000000N / AN / ASmall0
850Map78HemmingfordMontérégie3,67,341021A+0Small7291
851Map193Sainte ClotildeMontérégie0,4117003A+0Small986
852Map276Saint-Patrice-de-SherringtonMontérégie000002N / AN / ASmall0
853Map276NapiervilleMontérégie000004N / AN / ASmall0
854Map276Saint-Cyprien-de-NapiervilleMontérégie000004N / AN / ASmall0
857Map276Saint MichelMontérégie000002N / AN / ASmall0
858Map124Saint-RémiMontérégie1,513,288022A+0Small13211
861Map10St. ChrysostomMontérégie21,157,51450212A+0Small57515
864Map32OrmstownMontérégie9,133,61440154A+0Small33558
865Map276HinchinbrookeMontérégie000001N / AN / ASmall0
867Map1HuntingdonMontérégie91,6230780189A+0Small230000
870Map276Saint-AnicetMontérégie000001N / AN / ASmall0
875Map188Sainte-MartineMontérégie0,472,6220210A+0Small2638
876Map41BeauharnoisMontérégie8212,6681012427AT0Medium212648
880Map14Salaberry-de-ValleyfieldMontérégie16,7707,468003040AT69Medium707437
882Map276Rivière-BeaudetteMontérégie000001N / AN / ASmall0
884Map185St. PolycarpMontérégie0,541,34034A+0Small1292
885Map211St. ZotiqueMontérégie0,262,37013A+0Small2340
886Map103The hillsidesMontérégie2,342,42110911A+0Small42443
887Map143Coteau-du-LacMontérégie1,138,2300119A+0Small38192
891Map276L'Île-PerrotMontérégie000003N / AN / AMedium0
892Map123Notre-Dame-de-l'Île-PerrotMontérégie1,576,614801422AT19Medium76589
893Map144PincourtMontérégie1,13070006AT19Medium30015
895Map179Vaudreuil-DorionMontérégie0,5824159107A+0Medium23992
898Map276HudsonMontérégie000002N / AN / ASmall0
899Map191Saint LazareMontérégie0,459,516024A+0Medium9531
903Map162RigaudMontérégie0,856,8340013A+0Small6759
906Map27Saint-EustacheLaurentians10,5475,9268331324A+95Medium475860
907Map25Two-MountainsLaurentians11,1692,11550206A+0Medium692104
908Map221Sainte-Marthe-sur-le-LacLaurentians0,1711,18066A+0Medium11052
910Map276Saint-Joseph-du-LacLaurentians000003N / AN / ASmall0
911Map205OkayLaurentians0,331,92003A+0Small1927
914Map240BoisbriandLaurentians0,12,820014A+50Medium2781
915Map134Sainte-ThérèseLaurentians1,2134,227006A+0Medium134208
916Map154BlainvilleLaurentians0,91134,3280211A+0Medium134252
917Map109RosemèreLaurentians276,6220612A+15Medium76637
918Map120LorraineLaurentians1,651,48055A+15Small51364
919Map43Bois-des-FilionLaurentians7,675,5118076AT0Small75549
920Map135Sainte-Anne-des-PlainesLaurentians1,217,649005A+0Medium17584
921Map115MirabelLaurentians1,7818,3433203191A+0Medium818331
923Map64Saint-JérômeLaurentians5,1695,21990148A+0Medium695227
924Map236Hagia SophiaLaurentians0,1227002AT0Medium2049
925Map190PrévostLaurentians0,466,123066A+0Medium6101
928Map261Saint-André-d'ArgenteuilLaurentians0,020,11003F0Small122
929Map6The fallLaurentians26,2351,9773011720A+0Medium351890
933Map222Brownsburg-ChathamLaurentians0,161,238003A+0Small1178
939Map276Sainte-Marguerite-du-Lac-MassonLaurentians000003N / AN / ASmall0
940Map241Sainte-AdèleLaurentians0,15,5200018AT0Medium5517
941Map108PiedmontLaurentians2,129,624056VS0Small29578
943Map132St. SaviourLaurentians1,229,624057VS0Medium29578
947Map276Saint-Adolphe-d'HowardLaurentians000001N / AN / ASmall0
948Map276Val MorinLaurentians000001N / AN / ASmall0
949Map276Val DavidLaurentians000001N / AN / ASmall0
952Map141Sainte-Agathe-des-MontsLaurentians1,111,928005A+0Medium11869
954Map276Saint-Faustin--Lac-CarréLaurentians000000N / AN / ASmall0
963Map252Mont TremblantLaurentians0,061,8111110A+1Medium1782
965Map254The beautifulLaurentians0,060,11016A+0Small134
975Map234Rivière-RougeLaurentians0,120,514034A+0Small550
980Map259Lac-des-ÉcorcesLaurentians0,020,23013A+0Small157
981Map58Mont LaurierLaurentians684,45190224A+0Medium84368
982Map194New FarmLaurentians0,41,140008A+0Small1100
1001Map203Saint-André-AvellinOutaouais0,361,310054AT0Small1329
1002Map220PapineauvilleOutaouais0,180,44014A+0Small380
1004Map276ThursoOutaouais000007N / AN / ASmall0
1022Map156GatineauOutaouais0,89512,886202899AT15Large512777
1025Map276Val-des-MontsOutaouais000000N / AN / AMedium0
1026Map257CantleyOutaouais0,030,310091A+0Medium331
1027Map276chelseaOutaouais000006N / AN / ASmall0
1028Map276PontiacOutaouais000003N / AN / ASmall0
1029Map276La PêcheOutaouais000004N / AN / ASmall0
1034Map276GracefieldOutaouais000001N / AN / ASmall0
1040Map37ManiwakiOutaouais8,447,61500015A+0Small47591
1075Map213TémiscamingAbitibi-Témiscamingue0,250,71007A+0Small698
1079Map56Ville-MarieAbitibi-Témiscamingue6,115,243076A+0Small15204
1100Map169Rouyn NorandaAbitibi-Témiscamingue0,713051038012656AT1Medium305013
1110Map224macamicAbitibi-Témiscamingue0,150,42016A+0Small413
1115Map90SaarlandAbitibi-Témiscamingue321,673069A+0Small21627
1134Map22AmosAbitibi-Témiscamingue12,1154,469516119A+0Medium154440
1145Map107Val d'OrAbitibi-Témiscamingue2,1419,641901826AT16Medium419621
1147Map119MalarticAbitibi-Témiscamingue1,65,27015A+0Small5226
1148Map276SenneterreAbitibi-Témiscamingue000009N / AN / ASmall0
1157Map53The TuqueMauricie6,268,32670914AT0Medium68302
1167Map158RobervalSaguenay--Lac-Saint-Jean0,898,81070017A+31Small8752
1169Map276Saint PrimeSaguenay--Lac-Saint-Jean000005N / AN / ASmall0
1170Map113Saint-FélicienSaguenay--Lac-Saint-Jean1,938,317601118A+0Medium38287
1178Map140Dolbeau-MistassiniSaguenay--Lac-Saint-Jean1,133,91570014A+0Medium33879
1179Map139AlbanelSaguenay--Lac-Saint-Jean1,123,798009A+0Small23692
1180Map110NormandinSaguenay--Lac-Saint-Jean218,124002A+0Small18079
1190Map231Métabetchouan--Lac-à-la-CroixSaguenay--Lac-Saint-Jean0,1317009A+0Small988
1191Map94HébertvilleSaguenay--Lac-Saint-Jean2,87,245014A+0Small7196
1193Map104Saint BrunoSaguenay--Lac-Saint-Jean2,36,830001A+12Small6775
1194Map238Saint-GédéonSaguenay--Lac-Saint-Jean0,110,21004A+0Small243
1195Map76AlmaSaguenay--Lac-Saint-Jean3,8473,85260426A+0Medium473791
1196Map276Saint NazaireSaguenay--Lac-Saint-Jean000003N / AN / ASmall0
1199Map189The Ascension-of-Our-LordSaguenay--Lac-Saint-Jean0,460,97001A+0Small939
1208Map137SaguenaySaguenay--Lac-Saint-Jean1,21349,920010137164AT110Large1349897
1215Map245Saint FulgenceSaguenay--Lac-Saint-Jean0,090,22013A+0Small183
1216Map167Saint-HonoréSaguenay--Lac-Saint-Jean0,718,633104A+0Small8610
1217Map276Saint-David-de-FalardeauSaguenay--Lac-Saint-Jean000001N / AN / ASmall0
1219Map204St. AmbroseSaguenay--Lac-Saint-Jean0,351,410034A+0Small1381
1232Map88ForestvilleNorth Coast3,1930005E0Small8957
1240Map68Baie ComeauNorth Coast4,1172,2810114A+0Medium172213
1248Map91Sept-ÎlesNorth Coast2,9357,4300013AT0Medium357436
1249Map122Port CartierNorth Coast1,510,19006AT0Small10126
1250Map214FermontNorth Coast0,240,66005A+0Small598
1273Map82Havre-Saint-PierreNorth Coast3,411,616003F0Small11624
1287Map187Lebel-sur-QuévillonNorthern Quebec0,4714012A+0Small1023
1291Map79ChibougamauNorthern Quebec3,627,428035A+0Small27427

Map of wastewater discharges

Map of wastewater discharges donne un portrait plus global de la situation: y sont répertoriés le nombre des déversements et leurs durées totales annuelles sur le territoire des municipalités. Celles-ci sont tenues par la loi de fournir ces informations au ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP). La carte interactive s’appuie d’ailleurs sur les données du MELCCFP.

Understand how the map works

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Credits and acknowledgements

The wastewater map is based on the data colligées par le MELCCFP entre 2011 et 2024. L’extraction de données et leur organisation a été rendue possible grâce au AuditEAU, a wastewater management software développé par notre équipe avec l’appui de Charles de Grandpré. La première mouture a bénéficié de la contribution d’étudiant.e.s from UQAM's journalism program and media school, under the supervision of the teacher Jean Hugues Roy.

Wastewater management in Quebec: an issue of adaptation to climate change

Significant quantities of wastewater are discharged into Quebec's rivers every day because they cannot be treated by municipal sewage systems. Heavy rains, insufficient capacity and failure (cross-connections) of sewer systems, under-investment by the government, urban development without consideration for the environment: the causes are multiple.

Climate change is not helping the situation. According to Ouranos, episodes of heavy rain will be more intense and more frequent, resulting in flooding and overflows due to overloading of sewer networks.

What are the solutions to stop spills?

Spill Reduction Objective

Quebec does not have an overall objective for reducing wastewater discharges. The Ministry of the Environment asks municipalities not to increase the number beyond that of 2013 and even gives them until 2030 to do so. Instead, it should encourage them to reduce spills, as some municipalities are already doing! 

Strategic financing of municipal infrastructure

By allocating funding to municipalities based on the impact on their receiving environment rather than on a first-come, first-served basis, the Ministry of Municipal Affairs and Housing (MAMH) would greatly contribute to the solution.

Proper Spill Measures

Measuring spills correctly is essential to have a clear picture of the situation and be able to act at the source. However, nearly 200 municipalities do not do it even though it has been obligatory for almost 10 years. The Ministry of the Environment imposes almost no sanctions. If cities were monitored, they would certainly be more likely to comply with the regulation.

Territory Development

More green infrastructure and less impermeable (concrete) surfaces would reduce pressure on sewer networks. The absorbent power of plants would limit rainwater runoff. Also, the Real estate development must be done in harmony with the capacity of the network. Some cities do not hesitate to impose a moratorium on development, a bold and exemplary gesture!

Make a difference for the environment

Become a member of the Foundation by donating. Your contribution allows our team to continue to mobilize to protect Quebec's rivers and waterways for future generations. 

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