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Thames Water Region · Live Intelligence
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WaterWatch surfaces combined sewer overflow data from the Environment Agency and presents it without editorialising. Discharge records, durations, and frequencies — exactly as reported.

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Sites discharging now
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Discharged past 48hrs
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Thames CSO sites monitored
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EA data update interval

What WaterWatch does

One platform. Every overflow. All the data.

Live now

Complete visibility from day one.

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Live discharge map
Every active CSO event plotted in real time, sourced directly from Thames Water EDM sensor data. Updated every 15 minutes.
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Per-site history
Drill into any overflow point for a full record of discharge events — start time, duration, and total hours spilling by month and year.
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Instant alerts
Get notified by email or SMS the moment a discharge event is recorded at a site you follow. Free, no spam, unsubscribe anytime.
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CSV export
Download raw discharge data for any site or date range for your own analysis.
Coming soon
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Site rankings
Every Thames Water CSO site ranked by total spill hours and event count. Sortable by time period.
Coming soon
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Trend data
Year-on-year discharge totals per site. See whether frequency and duration are increasing or improving.
Coming soon
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Intelligent predictions
ML models built on weather forecasts and sensor history — flagging sites likely to overflow before they do.
Coming soon
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Analytics portal
Custom date ranges, multi-site comparisons, and full report exports for researchers and journalists.

How it works

From sensor to your inbox in minutes.

01
🏭
Thames Water logs it
EDM sensors at each CSO site record when discharge starts and stops, reporting to the Environment Agency every 15 minutes.
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We ingest it
WaterWatch pulls the latest readings continuously and detects the moment a site transitions to discharging.
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Map updates live
The discharge map reflects the current state of every monitored site in real time — no refresh needed.
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You get notified
If you're subscribed to a site, we fire an alert the moment it starts or stops discharging.

Our approach

Data as it is. Nothing added.

WaterWatch does not editorialise or layer interpretation on top of the numbers. All data originates from Thames Water's EDM sensor network — the same data they are legally required to submit to regulators. We display what is recorded. You draw your own conclusions.

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Source-attributed
Every data point links back to the Thames Water EDM sensor and permit reference it originated from.
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Numbers, not narratives
We show spill counts, durations, and cumulative hours. No severity scores or hidden weightings.
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Timestamped as reported
Events are shown with the timestamp Thames Water logged them — not when WaterWatch ingested them.
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Limitations disclosed
EDM sensors have documented failure rates. We surface missing or flagged readings rather than silently filling gaps.
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Know the moment it happens.

Subscribe to any CSO site and get an instant alert when discharge starts or stops. Email and SMS supported. Free, no spam, unsubscribe any time.

Or browse the map and click any site to subscribe