/-88.068874,41.801727,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
Saint Joseph Creek
Saint Joseph Creek, Lisle
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200 Datapoints
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21 Observations
- Monitored since: 02 December 2023
- Last observation on: 19 April 2026
- Data collector: Robert Swirsky
Latest water quality data added
596,550 datapoints at 9,436 locations
+602 new locations added in the last 30 days
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View trends at this location
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/-88.529334,41.824729,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationSouth of Kaneville
Welch Creek, Elburn
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121 Datapoints
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20 Observations
- Monitored since: 03 December 2023
- Last observation on: 19 April 2026
- Data collector: Scott Meister
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/-1.022029,51.320131,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationLongbridge Mill
River Loddon, Sherfield On Loddon
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272 Datapoints
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17 Observations
- Monitored since: 21 February 2025
- Last observation on: 19 April 2026
- Data collector: Josh Bowes
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/-88.03261,41.531262,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationHickory Creek River at Highland Park Drive
Hickey Creek River, Joliet
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112 Datapoints
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12 Observations
- Monitored since: 16 November 2024
- Last observation on: 18 April 2026
- Data collector: Kathy Janik
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/-88.292574,42.166684,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationMain Street
Crystal Creek, Algonquin
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114 Datapoints
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14 Observations
- Monitored since: 25 November 2024
- Last observation on: 18 April 2026
- Data collector: JoAnn Schindler
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/-88.290297,42.16626,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationDam 62
Fox River, Algonquin
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126 Datapoints
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13 Observations
- Monitored since: 25 November 2024
- Last observation on: 18 April 2026
- Data collector: JoAnn Schindler
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/-76.886573,44.096323,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationPrinyer’s Cove Park & Boat Launch
Adolphus Reach on Lake Ontario, Picton
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343 Datapoints
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33 Observations
- Monitored since: 25 September 2020
- Last observation on: 18 April 2026
- Data collector: Don Ross
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/-76.885371,44.088371,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationPrinyer’s Cove Source
Prinyer’s Cove on Lake Ontario, Picton
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278 Datapoints
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27 Observations
- Monitored since: 10 August 2021
- Last observation on: 18 April 2026
- Data collector: Don Ross
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/-0.030985,51.60745,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationFolly Lane EA monitoring point
The Ching, London
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749 Datapoints
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50 Observations
- Monitored since: 23 March 2025
- Last observation on: 18 April 2026
- Data collector: Harrison Tremain
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/-88.35469,41.659687,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationMorgan Creek at Morgan Creek Park
Morgan Creek, Oswego
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156 Datapoints
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20 Observations
- Monitored since: 30 November 2023
- Last observation on: 17 April 2026
- Data collector: Alyssa Theodor
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/-88.353252,41.686011,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationWaubonsie Creek
Waubonsie Creek, Oswego
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162 Datapoints
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20 Observations
- Monitored since: 30 November 2023
- Last observation on: 17 April 2026
- Data collector: Mary Theodor
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/-88.353617,42.043986,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationSandy Creek in Elgin Township Wetland preserve
Sandy Creek, Elgin
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68 Datapoints
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10 Observations
- Monitored since: 19 December 2023
- Last observation on: 17 April 2026
- Data collector: Holly Hudson
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/-88.135098,41.754418,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationPioneer Park Canoe launch
West DuPage River, Naperville
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64 Datapoints
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14 Observations
- Monitored since: 29 November 2024
- Last observation on: 17 April 2026
- Data collector: Mike Watson
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/-88.05162,41.829657,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationRound Meadow Lake
Round Meadow Lake in Hidden Lake Forest Preserve in DuPage County, IL, Glen Ellyn
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173 Datapoints
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19 Observations
- Monitored since: 14 December 2023
- Last observation on: 17 April 2026
- Data collector: Jane Barnett
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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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684 Datapoints
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62 Observations
- Monitored since: 14 July 2024
- Last observation on: 17 April 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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681 Datapoints
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63 Observations
- Monitored since: 14 July 2024
- Last observation on: 17 April 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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821 Datapoints
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65 Observations
- Monitored since: 23 November 2023
- Last observation on: 17 April 2026
- Data collector: Alistair Young
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/-76.989377,43.934881,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationLittle Bluff Conservation Area
Lake Ontario, Picton
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596 Datapoints
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53 Observations
- Monitored since: 16 April 2017
- Last observation on: 17 April 2026
- Data collector: Don Ross
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/-88.071096,41.639601,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationIsle la Cache Canoe Launch
Des Plaines River, Romeoville
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27 Datapoints
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6 Observations
- Monitored since: 10 November 2025
- Last observation on: 17 April 2026
- Data collector: Sharon Dyrkacz
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/-89.642172,32.665102,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationOld Highway 13 Bridge
Pearl River, Lena
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2,942 Datapoints
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208 Observations
- Monitored since: 19 September 2018
- Last observation on: 17 April 2026
- Data collector: William W Mitchell
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