/-0.060575,51.58111,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
Markfield Park (Stonebridge Brook) CSO
River Lea, London
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220 Datapoints
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17 Observations
- Monitored since: 29 June 2024
- Last observation on: 01 February 2026
- Data collector: Philly Nicholls
Latest water quality data added
568,617 datapoints at 9,414 locations
+469 new locations added in the last 30 days
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View trends at this location
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/0.020547,51.627561,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationWhitehall Plain
The Ching, Buckhurst Hill
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608 Datapoints
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57 Observations
- Monitored since: 14 July 2024
- Last observation on: 01 February 2026
- Data collector: Alistair Young
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/0.025535,51.634055,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationFootbridge near Rangers Road
Ching Brook, Buckhurst Hill
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592 Datapoints
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57 Observations
- Monitored since: 14 July 2024
- Last observation on: 01 February 2026
- Data collector: Mo Tausif
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/0.025654,51.63776,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationDownstream of Connaught Water
The Ching, Buckhurst Hill
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749 Datapoints
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60 Observations
- Monitored since: 23 November 2023
- Last observation on: 01 February 2026
- Data collector: Alistair Young
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/-87.801554,41.676871,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationWest College Drive (Rt 83) & S. 75 th Ave Palos Heights,Il 60463
Lake Katherine Nature Center/Cal Sag Channel, Palos Heights
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69 Datapoints
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10 Observations
- Monitored since: 20 November 2024
- Last observation on: 01 February 2026
- Data collector: Kathy Janik
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/-87.694112,41.957612,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationRiverbank Neighbors - Berteau
Chicago River, Chicago
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61 Datapoints
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9 Observations
- Monitored since: 18 November 2024
- Last observation on: 01 February 2026
- Data collector: Sean Carino
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/-88.13182,41.720857,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationWest Branch of the Dupage River at Weigand Riverfront Park
West Branch of the Dupage River, Naperville
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14 Datapoints
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3 Observations
- Monitored since: 23 November 2025
- Last observation on: 01 February 2026
- Data collector: Erin Bellassai
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/-90.678549,40.447836,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationKilljordan creek
Stream, Macomb
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4 Datapoints
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1 Observations
- Monitored since: 31 January 2026
- Last observation on: 31 January 2026
- Data collector: Jumoke Ogunremi
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/-88.12681,41.740342,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationWest Branch Dupage River
WBDR, Naperville
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49 Datapoints
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8 Observations
- Monitored since: 07 December 2023
- Last observation on: 31 January 2026
- Data collector: Fred Girard
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/-87.846235,41.928919,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationRiver Grove at Grand Ave
Des Plaines River, River Grove
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50 Datapoints
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8 Observations
- Monitored since: 17 February 2022
- Last observation on: 31 January 2026
- Data collector: Candice N. Garcia
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/-87.968055,41.90504,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationSalt Creek Greenway Trail (just south of North Avenue)
Salt Creek, Villa Park
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18 Datapoints
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1 Observations
- Monitored since: 31 January 2026
- Last observation on: 31 January 2026
- Data collector: Robert Wagner
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/-88.116062,41.714489,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationDuPage River Park - Small Pond - Site 2
Pond, Naperville
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98 Datapoints
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9 Observations
- Monitored since: 30 November 2024
- Last observation on: 31 January 2026
- Data collector: Leah Gladkowski
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/-87.533433,41.640838,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationForest Preserves of Cook County - Burnham, Illinois
Powderhorn Lake, Burnham
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19 Datapoints
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3 Observations
- Monitored since: 15 November 2025
- Last observation on: 31 January 2026
- Data collector: David Schmid
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/-88.179081,41.976848,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationWinding Creek
Winding Creek, Bartlett
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86 Datapoints
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13 Observations
- Monitored since: 10 December 2023
- Last observation on: 31 January 2026
- Data collector: Karen Liebold
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/-87.64309,41.629013,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationForest Preserves of Cook County - Kickapoo Woods
Little Calumet River, Harvey
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70 Datapoints
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10 Observations
- Monitored since: 26 November 2024
- Last observation on: 31 January 2026
- Data collector: David Schmid
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/-74.576677,45.052084,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationGlen Walter
St Lawrence River, Summerstown
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44 Datapoints
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4 Observations
- Monitored since: 02 December 2025
- Last observation on: 31 January 2026
- Data collector: John Lounsberry
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/-88.134856,41.754183,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationDuPage River, West Branch
DuPage River, West Branch, Naperville
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38 Datapoints
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10 Observations
- Monitored since: 24 November 2024
- Last observation on: 31 January 2026
- Data collector: BRENDAN BANASZAK
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/-60.8747,45.6608,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationSt. Peter's Lions Club Marina
Bras d'Or Lake , St. Peter'S
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31 Datapoints
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3 Observations
- Monitored since: 30 November 2025
- Last observation on: 31 January 2026
- Data collector: Melanie MacNeil
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/-79.213292,43.03917,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationWelland Canal at Port Robinson Ferry
Welland Canal, Port Robinson
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387 Datapoints
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19 Observations
- Monitored since: 30 December 2024
- Last observation on: 31 January 2026
- Data collector: Gabrielle Parent-Doliner
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/-88.165777,41.772796,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationJefferson Ave Bridge, Naperville, West Branch DuPage River
West Branch DuPage River, Naperville
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75 Datapoints
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9 Observations
- Monitored since: 01 December 2024
- Last observation on: 31 January 2026
- Data collector: Julie Kulak
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