/-88.387628,41.831276,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
Lake Run at Nelson Lake in Dick Young Forest Preserve
Lake Run, Batavia
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98 Datapoints
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18 Observations
- Monitored since: 28 November 2023
- Last observation on: 09 March 2026
- Data collector: Maureen Mrenna
Latest water quality data added
580,204 datapoints at 9,352 locations
+563 new locations added in the last 30 days
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View trends at this location
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/-87.702865,41.945966,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationClark Park Boathouse
Chicago River , Chicago
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49 Datapoints
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6 Observations
- Monitored since: 11 January 2023
- Last observation on: 09 March 2026
- Data collector: Susanna Lang
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/-88.160541,41.697109,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationSpringbrook Water Reclamation Center Upstream
DuPage River, Bolingbrook
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118 Datapoints
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19 Observations
- Monitored since: 15 November 2023
- Last observation on: 09 March 2026
- Data collector: Amy Wrigley
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/-88.140178,41.757642,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationBridge over river on Gartner Road near Edgewater Drive
West Branch DuPage River, Naperville
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47 Datapoints
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6 Observations
- Monitored since: 24 December 2024
- Last observation on: 09 March 2026
- Data collector: Antara Prasad
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/-87.933068,41.825396,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationfullersburg woods
Salt Creek, Oak Brook
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36 Datapoints
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14 Observations
- Monitored since: 11 November 2023
- Last observation on: 09 March 2026
- Data collector: Linda Cise
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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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77 Datapoints
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11 Observations
- Monitored since: 07 December 2023
- Last observation on: 09 March 2026
- Data collector: Fred Girard
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/-79.998452,43.087931,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationLower LaFortune Park
Grand River, Caledonia
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63 Datapoints
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5 Observations
- Monitored since: 05 December 2025
- Last observation on: 09 March 2026
- Data collector: Kiersten Garside
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/-79.254562,42.963895,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationWelland International Flatwater Centre
Welland Canal , Welland
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203 Datapoints
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16 Observations
- Monitored since: 10 January 2025
- Last observation on: 09 March 2026
- Data collector: Michelle West
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/-0.112069,51.632232,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationGrovelands Park Lake Outfall by cafe and dam
Salmons Brook/Houndsden Gutter/Grovelands Stream, London
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494 Datapoints
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97 Observations
- Monitored since: 23 April 2023
- Last observation on: 09 March 2026
- Data collector: Alistair Young
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/-0.116322,51.630718,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationGrovelands Park Lake Entry
Salmons Brook/Houndsden Gutter/Grovelands Stream, London
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575 Datapoints
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110 Observations
- Monitored since: 23 April 2023
- Last observation on: 09 March 2026
- Data collector: Alistair Young
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/-0.111863,51.633371,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationGrovelands Park Stream below dam
Salmons Brook/Houndsden Gutter/Grovelands Stream, London
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474 Datapoints
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87 Observations
- Monitored since: 30 July 2023
- Last observation on: 09 March 2026
- Data collector: Alistair Young
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/-0.115829,51.630991,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationGrovelands Park Lake Downstream of reedbeds
Salmons Brook/Houndsden Gutter/Grovelands Stream, London
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346 Datapoints
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50 Observations
- Monitored since: 12 August 2024
- Last observation on: 09 March 2026
- Data collector: Philly Nicholls
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/-0.189478,51.617261,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationFolly pre confluence
Folly Brook, London
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274 Datapoints
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17 Observations
- Monitored since: 05 February 2025
- Last observation on: 09 March 2026
- Data collector: Dianne Murphy
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/-0.188778,51.616235,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationOutfall at RMI Site
Dollis Brook , London
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208 Datapoints
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12 Observations
- Monitored since: 15 June 2025
- Last observation on: 09 March 2026
- Data collector: Judith Howlett
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/-0.188847,51.616455,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationRiverside Park (Upstream)
Dollis Brook, London
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400 Datapoints
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34 Observations
- Monitored since: 20 May 2023
- Last observation on: 09 March 2026
- Data collector: Alistair Young
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/-0.189024,51.616017,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationRiverside Park (Downstream)
Dollis Brook, London
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356 Datapoints
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32 Observations
- Monitored since: 20 May 2023
- Last observation on: 09 March 2026
- Data collector: Alistair Young
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/-1.053336,51.271694,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationBartons Mill
River Loddon, Basingstoke
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133 Datapoints
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11 Observations
- Monitored since: 15 January 2025
- Last observation on: 09 March 2026
- Data collector: Josh Bowes
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/-87.833252,41.913146,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationEvans Field - Des Plaines River -Trail Marker 215
Des Plaines River , River Grove
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105 Datapoints
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12 Observations
- Monitored since: 29 November 2024
- Last observation on: 08 March 2026
- Data collector: Serena Pesch
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/-79.27537,43.190155,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationHenley Island Boathouse
Martindale Pond, St. Catharines
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192 Datapoints
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19 Observations
- Monitored since: 29 October 2024
- Last observation on: 08 March 2026
- Data collector: Nengi Dublin-Green
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/-88.036537,41.883241,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationHill Ave Bridge
East Branch DuPage River, Lombard
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113 Datapoints
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20 Observations
- Monitored since: 17 November 2023
- Last observation on: 08 March 2026
- Data collector: Joe Wywrot
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