About this organization
Thames21's water monitoring programme relies on citizen scientists to collect crucial data on river health, focusing on water quality
Read moreRecent locations
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Dataset: Lea Guardians
Whitehall Outfall 5b - River Ching
467 datapoints on 39 dates (March 14 2025 → January 18 2026)
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Dataset: Lea Guardians
Whitehall Outfall 5a - River Ching
471 datapoints on 39 dates (March 14 2025 → January 18 2026)
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Dataset: Lea Guardians
Newgate Street - The Ching
612 datapoints on 69 dates (July 19 2024 → January 18 2026)
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Dataset: Lea Guardians
D/S Whitehall Rd - The Ching
639 datapoints on 71 dates (July 19 2024 → January 18 2026)
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Dataset: Lea Guardians
Whitehall Outfalls - The Ching
644 datapoints on 70 dates (July 19 2024 → January 18 2026)
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Dataset: Lea Guardians
Grovelands Park Lake Entry - Salmons Brook/Houndsden Gutter/Grovelands Stream
554 datapoints on 107 dates (April 23 2023 → January 16 2026)
Recent photos
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Maryon Wilson Park , 10 January 2026
Dataset: Marsh Dykes & Thamesmead Water Quality Group -
Slade Pond Inlet, 12 January 2026
Dataset: Marsh Dykes & Thamesmead Water Quality Group -
Slade Pond Outfall, 12 January 2026
Dataset: Marsh Dykes & Thamesmead Water Quality Group -
Whetstone Stray , 14 January 2026
Dataset: Brent Catchment Water Quality Working Group