The Water Framework Directive is a piece of European legislation that states that all UK waterbodies (rivers, lakes, seas) must be in ‘good ecological status’ by 2027.
| Waterbody | Overall Waterbody Classification | Reasons for Failure | Hydromorphological Supporting Elements | Supporting Elements (Surface Water) | |
| Mimram (Whitwell to Codicote Bottom) | Moderate | Macrophytes and Phytobenthos Combined (Moderate) | Hydrological Regime | Does Not Support Good | Not Assessed |
| Phosphate (Moderate) | Morphology | Supports Good | |||
| Mimram (Codicote Bottom to Lee) | Moderate | Fish (Moderate) | Hydrological Regime | Does Not Support Good | Not Assessed |
| Morphology | Supports Good | ||||