| 1 | Male' Water & Sewerage Company PVT LTD | Maldives | Malé | Ma Fen Building | Male | 20375 | N/A | 1995 | $98,362,843,814 | 1,000 | N/A | N/A | C-0067/1995 |
| 2 | Environmental Services Solutions LIMITED | Hongkong | Kwun Tong District | Rm 01 7/f Nanyang Plz | Kwun Tong District | N/A | N/A | 1998 | $11,648,868,429 | 150 | N/A | N/A | 22137483 |
| 3 | Sanear Saneamento De Aracatuba SA | Brazil | San Bernardo del Campo | Av. Imperatriz Leopoldina 150 | São Paulo | 09770-270 | N/A | 1997 | $4,494,620,924 | 17 | N/A | N/A | 01182340000143 |
| 4 | Beijing Enterprises Water Group LIMITED | Hongkong | Wan Chai District | Rm 6706-07 67/f Central Plz | Wan Chai District | N/A | N/A | 1993 | $3,349,741,460 | 68 | N/A | N/A | 16802939 |
| 5 | Luoyang Tuohuang Feiqi Resource Multipurpose Utilization CO., LTD. | China | Luoyang | No. 108109, Building 8, Block A, Shanghai International Trade Ci | Henan | 471000 | N/A | 2019 | $3,342,265,276 | 2 | N/A | N/A | 410325000044135 |
| 6 | Abwasserentsorgung Brunsbuttel GMBH (abg) | Germany | Brunsbüttel | Koogstr. 61-63 | Dithmarschen | 25541 | brunsbuettel.***** | 2014 | $3,185,976,000 | 2 | N/A | N/A | 25421B901ME |
| 7 | New Waterbusiness Tilburg B.V. | Netherlands | Tilburg | Dr. Hub van Doorneweg 195 | Noord-brabant | 5026 RE | equansrefrigeration.***** | 2019 | $1,410,024,216 | 20 | N/A | N/A | 60823658 |
| 8 | Atm B.V. | Netherlands | Zevenbergen | Vlasweg 12 | Noord-brabant | 4782 PW | atm.***** | 2013 | $1,322,003,493 | 200 | N/A | N/A | 20047607 |
| 9 | Japan Sewage Works Agency | Japan | Bunkyo-ku | 2-31-27, Yushima | Tōkyō | 113-0034 | N/A | 1972 | $1,312,950,996 | 1,567 | N/A | N/A | 2011105003406 |
| 10 | Supertank Transport B.V. | Netherlands | Harderwijk | Amperestraat 5 | Gelderland | 3846 AN | enviem.***** | 2023 | $1,128,983,804 | 20 | N/A | N/A | 72403551 |
| 11 | Dc Water And Sewer Authority | USA | Washington | 5000 Overlook Ave Sw | District of Columbia | 20032 | dcwater.***** | 1997 | $977,982,000 | 1,000 | N/A | N/A | N/A |
| 12 | Cajun Industries, LLC | USA | Baton Rouge | 15635 Airline Hwy | East Baton Rouge | 70817 | cajunusa.***** | 1973 | $931,064,552 | 1,000 | N/A | N/A | 30209260D |
| 13 | Tus Environmental Science And Technology Development Co.,ltd. | China | Yichang | No.77, Lvluo Rd., Xiling District | Hubei | 443000 | N/A | 1993 | $723,842,026 | 42,617 | N/A | N/A | 420000000030220 |
| 14 | Lanes Group LIMITED | Unitedkingdom | Lower Wortley | Ring Road | Leeds, West Yorkshire | LS12 6AB | lanesfordrains.***** | 1999 | $606,896,713 | 3,610 | N/A | N/A | 03784486 |
| 15 | Veolia Energy Solutions PTY LTD | Australia | Sydney | L 4 65 Pirrama Rd | New South Wales | 2009 | veolia.***** | 2008 | $520,980,980 | 6,220 | N/A | N/A | 129471558 |
| 16 | Veolia Australia Gp PTY LTD | Australia | Sydney | L 4 65 Pirrama Rd | New South Wales | 2009 | veolia.***** | 2016 | $520,980,980 | 6,220 | N/A | N/A | 616575234 |
| 17 | Veolia Water Services (anz) PTY LTD | Australia | Sydney | L 4 65 Pirrama Rd | New South Wales | 2009 | veolia.***** | 1995 | $520,980,980 | 6,220 | N/A | N/A | 069471334 |
| 18 | Seidco General Contracting Company - LLC - Abu Dhabi | United Arab Emirates | Abu Dhabi | Hamdan Street , Reem Island, Marina Square al Tamouh Tower, Floo | Abu Dhabi | N/A | N/A | 1990 | $517,044,500 | 3,500 | N/A | N/A | CN-1102221-1 |
| 19 | Water Agency INC. | Japan | Shinjuku-ku | 3-25, Higashigokencho | Tōkyō | 162-0813 | N/A | 1953 | $512,214,808 | 2,059 | N/A | N/A | 5011101016763 |
| 20 | Guangzhou Sewage Treatment Co.,ltd. | China | Guangzhou | No.501, Linjiang Avenue, Tianhe District | Guangdong | 510000 | N/A | 2003 | $503,134,487 | 2,186 | N/A | N/A | 440101000081870 |
| 21 | Metropolitan ST. Louis Sewer District | USA | Saint Louis | 2350 Market St Ste 300 | St. Louis City | 63103 | stlmsd.***** | 1954 | $475,230,479 | 976 | N/A | N/A | N/A |
| 22 | Affinity Water LIMITED | Unitedkingdom | Hatfield | Tamblin Way | Hertfordshire | AL10 9EZ | affinitywater.***** | 1990 | $459,942,221 | 1,462 | N/A | N/A | 02546950 |
| 23 | Mid-Atlantic Interstate Transmission, LLC | USA | Akron | 76 S Main St | Summit | 44308 | firstenergycorp.***** | 2017 | $440,174,955 | 1 | N/A | N/A | 5707643 |
| 24 | Hampton Roads Sanitation District | USA | Virginia Beach | 1434 Air Rail Ave | Virginia Beach | 23455 | hrsd.***** | 1946 | $426,941,000 | 700 | N/A | N/A | N/A |
| 25 | Vodokanal Sankt-Peterburga, Gup | Russia | Sankt-peterburg | 42 Ul. Kavalergardskaya | Sankt-peterburg | 191015 | vodokanal.***** | 1993 | $405,045,399 | 8,132 | N/A | N/A | 03323809 |
| 26 | American Water Enterprises, LLC | USA | Marlton | 701 Route 73 S | Camden | 08053 | cohassetwater.***** | 2000 | $392,953,139 | 1,400 | N/A | N/A | 2284096 |
| 27 | Yunnan Water Investment CO., LIMITED (unofficial Translation) | Hongkong | Tsim Sha Tsui | Rm 3110-11 31/f the Gateway Bldg Twr 1 Harbour City | Yau Tsim Mong District | N/A | N/A | 2014 | $386,200,412 | 57 | N/A | N/A | 64160696 |
| 28 | Hamburger Stadtentwässerung Anstalt Des Öffentlichen Rechts | Germany | Hamburg | Billhorner Deich 2 | Hamburg, Freie Und Hansestadt | 20539 | hamburgwasser.***** | 2009 | $385,389,497 | 1,100 | N/A | N/A | DE173526990 |
| 29 | Miejskie Przedsiębiorstwo Wodociągów I Kanalizacji W M St Warszawie S A | Poland | Warszawa | Plac Starynkiewicza 5 | Województwo Mazowieckie | 02015 | mpwik.***** | 2003 | $355,006,509 | 2,512 | N/A | N/A | 5250005662 |
| 30 | Rav Water Treatment I B.V. | Netherlands | Rotterdam | Professor Gerbrandyweg 10 | Zuid-holland | 3197 KK | avr.***** | 2020 | $317,621,622 | 20 | N/A | N/A | 58599630 |
| 31 | Sistema Intermunicipal De Los Servicios De Agua Potable Y Alcantarillado | Mexico | Guadalajara | Av. Dr. Roberto Michel No. 461 | Jalisco | 44460 | siapa.***** | 1978 | $310,005,001 | 2,881 | N/A | N/A | SIS780421IR3 |
| 32 | Bord Na Mona Public LIMITED Company | Ireland | Newbridge | Newbridge Post Office | Kildare | W12 ER27 | www2.***** | 1998 | $302,558,379 | 1,247 | N/A | N/A | 297717 |
| 33 | Hubei Yihui Medical Technology CO., LTD. Jingzhou Branch | China | Jinzhou | Jingli Road, Jingzhou District | Hubei | 441200 | N/A | 2016 | $286,949,285 | 0 | N/A | N/A | 421000000240129 |
| 34 | Metropolitan Sewer District Of Greater Cincinnati | USA | Cincinnati | 1600 Gest St | Hamilton | 45204 | msdgc.***** | 2002 | $284,462,000 | 600 | N/A | N/A | N/A |
| 35 | Sewerage & Water Board Of New Orleans | USA | New Orleans | 625 Saint Joseph St Rm 311 | Orleans | 70165 | swbno.***** | 1899 | $279,233,771 | 950 | N/A | N/A | N/A |
| 36 | Instituto Nacional De Aguas Potables Y Alcantarillados | Dominicanrepublic | Santo Domingo | Calle Guarocuya # 419, Edificio Inapa | Distrito Nacional | N/A | N/A | 1962 | $274,649,234 | 1,800 | N/A | N/A | 401007452 |
| 37 | Xylem Water Solutions UK LTD | Unitedkingdom | Nottingham | Colwick Industrial Estate | Nottingham | NG4 2AN | xyleminc.***** | 1958 | $274,531,048 | 646 | N/A | N/A | 00479504 |
| 38 | Soc De Mantencion Conservacion Y Reparacion S.A | Chile | Santiago | General Gonzalez Balcarce 2061 | Santiago | 8320000 | N/A | 1993 | $252,342,688 | 5,408 | N/A | N/A | 841827007 |
| 39 | Gmb Leidingtechnieken B.V. | Netherlands | Kampen | Dieselstraat 17 | Overijssel | 8263 AE | gmb.***** | 2011 | $250,273,326 | 416 | N/A | N/A | 05033131 |
| 40 | Louisville And Jefferson County Metropolitan Sewer District | USA | Louisville | 700 W Liberty St | Jefferson | 40203 | ihpd.***** | 1946 | $243,290,000 | 600 | N/A | N/A | N/A |
| 41 | Allegheny County Sanitary Authority | USA | Pittsburgh | 3300 Preble Ave | Allegheny | 15233 | alcosan.***** | 1946 | $240,198,345 | 350 | N/A | N/A | N/A |
| 42 | Sapphire Utility Solutions LIMITED | Unitedkingdom | Bamber Bridge | Sapphire Utilities | Lancashire | PR5 6BP | sus.***** | 2013 | $227,100,870 | 923 | N/A | N/A | 08368213 |
| 43 | Stadtentwässerungsbetriebe Köln, AÖR. | Germany | Köln | Ostmerheimer Str. 555 | Köln, Stadt | 51109 | steb-koeln.***** | 2001 | $224,639,342 | 642 | N/A | N/A | DE224970939 |
| 44 | Culligan International Company | Unitedkingdom | Hedsor | Unit 3, Blenheim Rd | Buckinghamshire | HP12 3RS | culligan.***** | 1973 | $214,022,000 | 50 | N/A | N/A | FC007631 |
| 45 | Aquambiente Servicios Para El Sector Del Agua Sau | Spain | Madrid | Calle Santa Leonor 39 | Madrid | 28037 | N/A | 1974 | $212,240,798 | 984 | N/A | N/A | A08332975 |
| 46 | Indah Water Konsortium SDN. BHD. | Malaysia | Kuala Lumpur | Menara Indah Water | Federal Territory of Kuala Lumpur | 60000 | iwk.***** | 1991 | $208,330,446 | 68 | N/A | N/A | 199101001452 |
| 47 | Tokyo Metropolitan Sewerage Service CORPORATION | Japan | Chiyoda-ku | 2-6-3, Otemachi | Tōkyō | 100-0004 | N/A | 1984 | $205,200,314 | 965 | N/A | N/A | 7010001034329 |
| 48 | Evides Afvalwater B.V. | Netherlands | Rotterdam | Schaardijk 150 | Zuid-holland | 3063 NH | evides.***** | 2005 | $197,648,245 | 36 | N/A | N/A | 22038410 |
| 49 | Mts Cleansing Services LIMITED | Unitedkingdom | Upnor | Stanley House | Medway | ME2 4NF | mtscleansing.***** | 1986 | $189,880,899 | 495 | N/A | N/A | 02045340 |
| 50 | Aquanet S A | Poland | Poznań | Ul. Dolna Wilda 126 | Województwo Wielkopolskie | 61492 | aquanet.***** | 2005 | $180,194,901 | 871 | N/A | N/A | 7770003274 |