/-88.03261,41.531262,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
Hickory 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
Latest water quality data added
596,507 datapoints at 9,444 locations
+601 new locations added in the last 30 days
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View trends at this location
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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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/-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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2,925 Datapoints
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207 Observations
- Monitored since: 19 September 2018
- Last observation on: 17 April 2026
- Data collector: William W Mitchell
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/-88.001456,41.784994,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationCreek under Fairmount Ave, east side of bridge
Creek under Fairmount Ave, Downers Grove
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137 Datapoints
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17 Observations
- Monitored since: 19 November 2024
- Last observation on: 17 April 2026
- Data collector: Tom Prince
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/-89.526472,32.707,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationHighway 35 Bridge
Pearl River, Carthage
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2,971 Datapoints
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212 Observations
- Monitored since: 03 October 2018
- Last observation on: 17 April 2026
- Data collector: William W Mitchell
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/0.019402,51.625457,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationD/S Whitehall Rd
The Ching, Buckhurst Hill
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807 Datapoints
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84 Observations
- Monitored since: 19 July 2024
- Last observation on: 17 April 2026
- Data collector: Kat Kavanagh
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/-0.087242,51.004992,16,0,0/380x220@2x?access_token=pk.eyJ1Ijoid2F0ZXJyYW5nZXJzIiwiYSI6ImNtMG5zdzhhMjAxMnkya3IzZHVybzlxMDEifQ.3GdXd13tReOaKwengLTZTg)
View trends at this locationSSV1 Scrase Valley
Scrase Stream , Haywards Heath
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40 Datapoints
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2 Observations
- Monitored since: 15 March 2026
- Last observation on: 17 April 2026
- Data collector: Samantha Smithson
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