Lee at Hertford Castle

Where and when

Last sampled

21 Sep 2026, 13:2517 days ago · time as the Environment Agency records it (UK clock time; the source gives no time zone)

Samples banked

6 since 9 Apr 2026 Imported periods: 1 Oct 2023 – 8 Oct 2026. Samples outside them are not shown here.

Latest sample

River / running surface water Environmental monitoring statutory (EU directives) · results completed 23 Sep 2026

Where

National Grid 532399, 212453As published, to the nearest 1 m. Open in a map

River, by its own name

Lee

River, by the map

River LeaPlaced on the river its name gives, 5 m from the line.

Next gauge downstream

Tumbling Bay Weir On the Amwell Loop · 5.2 km along the river

Nearest gauge upstream

Waterhall On the River Lee · 4.6 km along the riverPanshanger On the River Mimram · 5.2 km along the river

Why it was sampled

Environmental monitoring statutory (EU directives) (6 samples)

Results here were completed a median of 3 days after the sample was taken (2 to 5 days, 6 samples).

Main measurements, river water

Everything measured here

12 determinands, each kept by its code, unit and sample material: results in different units or on different materials are never mixed. A “below” result is under the laboratory's detection limit, not zero.