Click on a monitoring station name to view live and historical river data
| Station | Parameter | River | Town |
|---|---|---|---|
| Bishops Stortford, Grange Paddocks | Bishops Stortford, Grange Paddocks Level (Stage) | River Stort | Bishop'S Stortford |
| Borehamwood | Borehamwood Level (Stage) | Borehamwood Brook | Borehamwood |
| Bragbury Park | Bragbury Park Level (Stage) | Stevenage Brook | Stevenage |
| Braughing | Braughing Level (Stage) | River Quin | Ware |
| Buntingford | Buntingford Level (Stage) | River Rib | Buntingford |
| Cheshunt, Rosedale Way | Cheshunt, Rosedale Way Level (Stage) | Rags Brook | Waltham Cross |
| Cheshunt, Trinity Lane | Cheshunt, Trinity Lane Level (Stage) | Theobalds Brook | Waltham Cross |
| Cheshunt, Windmill Lane | Cheshunt, Windmill Lane Level (Stage) | Small River Lee | Waltham Cross |
| Colney Street | Colney Street Level (Stage) | River Ver | St. Albans |
| Croxley Green | Croxley Green Level (Stage) | River Gade | Rickmansworth |
| Dane End | Dane End Level (Stage) | River Beane | Ware |
| Fulling Mill | Fulling Mill Level (Stage) | River Mimram | Welwyn |
| Furneux Pelham | Furneux Pelham Level (Stage) | River Ash | Buntingford |
| Harlow Mill | Harlow Mill Level (Stage) | River Stort | Harlow |
| Harpenden | Harpenden Level (Stage) | River Lee | Harpenden |
| Hemel Hempstead, Bury Mill | Hemel Hempstead, Bury Mill Level (Stage) | River Gade | Hemel Hempstead |
| Hemel Hempstead, Old Fishery Lane | Hemel Hempstead, Old Fishery Lane Level (Stage) | River Bulbourne | Hemel Hempstead |
| Hemel Hempstead, Two Waters Road | Hemel Hempstead, Two Waters Road Level (Stage) | River Bulbourne | Hemel Hempstead |
| Hertford, Hartham Park | Hertford, Hartham Park Level (Stage) | River Beane | Hertford |
| Hitchin Gs | Hitchin Gs Level (Stage) | Hitchin | |
| Hoddesdon, Rye Bridge | Hoddesdon, Rye Bridge Flow | River Lee | Hoddesdon |
| Hoddesdon, Rye Bridge | Hoddesdon, Rye Bridge Level (Stage) | River Lee | Hoddesdon |
| Lilley Bottom Obh | Lilley Bottom Obh Level (Groundwater) | Hitchin | |
| Little Hadham | Little Hadham Level (Stage) | River Ash | Ware |
| London Colney | London Colney Level (Stage) | River Colne | St. Albans |
| Mardock | Mardock Level (Stage) | River Ash | Ware |
| Markyate | Markyate Level (Downstream Stage) | River Ver | St. Albans |
| Markyate | Markyate Level (Stage) | River Ver | St. Albans |
| Mimmshall Brook | Mimmshall Brook Level (Stage) | Mimmshall Brook | Potters Bar |
| Moor Lane | Moor Lane Level (Stage) | River Colne | Watford |
| North Mymms | North Mymms Level (Stage) | Mimmshall Brook | Hatfield |
| Panshanger | Panshanger Level (Stage) | River Mimram | Hertford |
| Pishiobury Brook | Pishiobury Brook Level (Stage) | Pishiobury Brook | Harlow |
| Radlett | Radlett Level (Stage) | Radlett Brook | Radlett |
| Redbourn | Redbourn Level (Downstream Stage) | River Ver | St. Albans |
| Redbourn | Redbourn Level (Stage) | River Ver | St. Albans |
| Redbourn | Redbourn Level (Downstream Stage) | River Red | St. Albans |
| Redbourn | Redbourn Level (Stage) | River Red | St. Albans |
| Rickmansworth | Rickmansworth Level (Downstream Stage) | River Chess | Rickmansworth |
| Rickmansworth | Rickmansworth Level (Stage) | River Chess | Rickmansworth |
| River Hill Obh | River Hill Obh Level (Groundwater) | St. Albans | |
| River Lee At Feildes Weir (Gauged) | River Lee At Feildes Weir (Gauged) Level (Stage) | Harlow | |
| Rye Meads Effluent At Rye Meads | Rye Meads Effluent At Rye Meads Level (Stage) | Hoddesdon | |
| Shaftenhoe End Rrb | Shaftenhoe End Rrb Level (Groundwater) | Royston | |
| Tumbling Bay Weir | Tumbling Bay Weir Level (Stage) | Amwell Loop | Ware |
| Wadesmill | Wadesmill Level (Stage) | River Rib | Ware |
| Walkern | Walkern Level (Stage) | River Beane | Stevenage |
| Waterhall | Waterhall Level (Stage) | River Lee | Hertford |
| Watford | Watford Level (Downstream Stage) | River Colne | Watford |
| Watford | Watford Level (Stage) | River Colne | Watford |
| Watton At Stone | Watton At Stone Level (Stage) | River Beane | Hertford |
| Whitwell | Whitwell Level (Stage) | River Mimram | Hitchin |