Thames (Leach to Evenlode) Water Body
Poor ecological status
Get Thames (Leach to Evenlode) data
Attributes
- Water Body IDGB106039030333
- Water Body TypeRiver
- Hydromorphological designationheavily modified
- NGRSP4497808846
- Catchment area7929.363 ha
- Length49.788 km
- Catchment area79.294 km2
- Surveillance Water BodyNo
Classifications
| Classification Item | 2019 |
|---|---|
| Ecological | Poor |
| Biological quality elements | Poor |
| Fish | Poor |
| Invertebrates | High |
| Physico-chemical quality elements | Moderate |
| Acid Neutralising Capacity | High |
| Ammonia (Phys-Chem) | High |
| Dissolved oxygen | High |
| Phosphate | Moderate |
| Temperature | Moderate |
| pH | High |
| Hydromorphological Supporting Elements | Supports good |
| Hydrological Regime | Does not support good |
| Supporting elements (Surface Water) | Moderate |
| Mitigation Measures Assessment | Moderate or less |
| Specific pollutants | High |
| Arsenic | High |
| Copper | High |
| Iron | High |
| Manganese | High |
| Permethrin | High |
| Toluene | High |
| Triclosan | High |
| Zinc | High |
| Chemical | Fail |
| Priority hazardous substances | Fail |
| Benzo(a)pyrene | Good |
| Cadmium and Its Compounds | Good |
| Dioxins and dioxin-like compounds | Good |
| Heptachlor and cis-Heptachlor epoxide | Good |
| Hexabromocyclododecane (HBCDD) | Good |
| Hexachlorobenzene | Good |
| Hexachlorobutadiene | Good |
| Hexachlorocyclohexane | Good |
| Mercury and Its Compounds | Good |
| Perfluorooctane sulphonate (PFOS) | Fail |
| Polybrominated diphenyl ethers (PBDE) | Fail |
| Tributyltin Compounds | Good |
| Trifluralin (Priority hazardous) | Good |
| Priority substances | Good |
| 1,2-dichloroethane | Good |
| Atrazine | Good |
| Benzene | Good |
| Cypermethrin (Priority) | Good |
| Fluoranthene | Good |
| Lead and Its Compounds | Good |
| Nickel and Its Compounds | Good |
| Pentachlorophenol | Good |
| Simazine | Good |
| Trichlorobenzenes | Good |
| Trichloromethane | Good |
| Other Pollutants | Good |
| Aldrin, Dieldrin, Endrin & Isodrin | Good |
| Carbon Tetrachloride | Good |
| DDT Total | Good |
| Tetrachloroethylene | Good |
| Trichloroethylene | Good |
| para - para DDT | Good |
Investigations into classification status
| Classification Element | Cycle | Year | Status | Outcome |
|---|---|---|---|---|
| Fish | 2 | 2015 | Poor |
Reasons for not achieving good (RNAG) and reasons for deterioration (RFD)
All reasons (RFDs and RNAGs) attributed to the classification elements in this water body.
| Reason Type | SWMI | Activity | Category | Classification Element | More information |
|---|---|---|---|---|---|
| RNAG | Diffuse source | Poor nutrient management | Agriculture and rural land management | Phosphate | Details |
| RNAG | Physical modification | Other (not in list, must add details in comments) | Water Industry | Fish | Details |
| RNAG | Physical modification | Barriers - ecological discontinuity | Other | Fish | Details |
| RNAG | Invasive non-native species | North american signal crayfish | No sector responsible | Fish | Details |
| RNAG | Physical modification | Barriers - ecological discontinuity | Other | Fish | Details |
| RNAG | Flow | Surface water abstraction | Water Industry | Hydrological Regime | Details |
| RNAG | Physical modification | Other (not in list, must add details in comments) | Recreation | Mitigation Measures Assessment | Details |
| RNAG | Physical modification | Inland boating and structures | Navigation | Fish | Details |
| RNAG | Unknown (pending investigation) | Unknown (pending investigation) | Sector under investigation | Perfluorooctane sulphonate (PFOS) | Details |
| RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Polybrominated diphenyl ethers (PBDE) | Details |
| RNAG | Physical modification | Other (not in list, must add details in comments) | Navigation | Mitigation Measures Assessment | Details |
| RNAG | Point source | Sewage discharge (continuous) | Water Industry | Phosphate | Details |
Reasons for not achieving good status by business sector
The issues preventing waters reaching good status and the sectors identified as contributing to them. The numbers in the table are individual counts of the reasons for not achieving good status with a confidence status of 'confirmed' and 'probable', where the latest classification is less than good status. There may be more than one reason in a single water body. Note, table does not include reasons for deterioration.
| Significant water management issue | Physical modifications | Pollution from waste water | Pollution from towns, cities and transport | Changes to the natural flow and level of water | Invasive non-native species | Pollution from rural areas | Pollution from abandoned mines |
|---|---|---|---|---|---|---|---|
| Agriculture and rural land management | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
| Industry | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Mining and quarrying | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Navigation | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| Urban and transport | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Water Industry | 1 | 1 | 0 | 0 | 0 | 0 | 0 |
| Local & central government | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Domestic general public | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Recreation | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| Waste treatment and disposal | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Other | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
| No sector responsible | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Sector under investigation | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Total | 4 | 1 | 0 | 0 | 0 | 1 | 0 |
Objectives
| Classification Item | Status | Year | Reasons |
|---|---|---|---|
| Ecological | Moderate | 2015 | Disproportionately expensive: Disproportionate burdens; Disproportionately expensive: Unfavourable balance of costs and benefits; Natural conditions: Ecological recovery time; Technically infeasible: No known technical solution is available; Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline |
| Biological quality elements | Good | 2039 | Disproportionately expensive: Disproportionate burdens; Natural conditions: Ecological recovery time |
| Fish | Good | 2039 | Natural conditions: Ecological recovery time |
| Invertebrates | Good | 2021 | Disproportionately expensive: Disproportionate burdens |
| Physico-chemical quality elements | Moderate | 2015 | Technically infeasible: No known technical solution is available |
| Acid Neutralising Capacity | Good | 2015 | |
| Ammonia (Phys-Chem) | Good | 2015 | |
| Dissolved oxygen | Good | 2015 | |
| Phosphate | Moderate | 2015 | Technically infeasible: No known technical solution is available |
| Temperature | Good | 2015 | |
| pH | Good | 2015 | |
| Hydromorphological Supporting Elements | Supports good | 2015 | |
| Hydrological Regime | Supports good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| Supporting elements (Surface Water) | Good | 2033 | Disproportionately expensive: Unfavourable balance of costs and benefits; Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline |
| Mitigation Measures Assessment | Good | 2033 | Disproportionately expensive: Unfavourable balance of costs and benefits; Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline |
| Specific pollutants | High | 2021 | Disproportionately expensive: Disproportionate burdens |
| Arsenic | High | 2015 | |
| Copper | High | 2015 | |
| Iron | High | 2015 | |
| Manganese | High | 2015 | |
| Permethrin | High | 2015 | |
| Toluene | High | 2015 | |
| Triclosan | High | 2021 | Disproportionately expensive: Disproportionate burdens |
| Zinc | High | 2015 | |
| Chemical | Good | 2063 | Natural conditions: Chemical status recovery time; Technically infeasible: No known technical solution is available |
| Priority hazardous substances | Good | 2063 | Natural conditions: Chemical status recovery time; Technically infeasible: No known technical solution is available |
| Benzo (b) and (k) fluoranthene | Good | 2015 | |
| Benzo (ghi) perelyene and indeno (123-cd) pyrene | Good | 2015 | |
| Benzo(a)pyrene | Good | 2015 | |
| Cadmium and Its Compounds | Good | 2015 | |
| Dioxins and dioxin-like compounds | Good | 2015 | |
| Heptachlor and cis-Heptachlor epoxide | Good | 2015 | |
| Hexabromocyclododecane (HBCDD) | Good | 2015 | |
| Hexachlorobenzene | Good | 2015 | |
| Hexachlorobutadiene | Good | 2015 | |
| Hexachlorocyclohexane | Good | 2015 | |
| Mercury and Its Compounds | Good | 2015 | |
| Perfluorooctane sulphonate (PFOS) | Good | 2039 | Technically infeasible: No known technical solution is available |
| Polybrominated diphenyl ethers (PBDE) | Good | 2063 | Natural conditions: Chemical status recovery time |
| Tributyltin Compounds | Good | 2015 | |
| Trifluralin (Priority hazardous) | Good | 2015 | |
| Priority substances | Good | 2015 | |
| 1,2-dichloroethane | Good | 2015 | |
| Atrazine | Good | 2015 | |
| Benzene | Good | 2015 | |
| Cypermethrin (Priority) | Good | 2015 | |
| Fluoranthene | Good | 2015 | |
| Lead and Its Compounds | Good | 2015 | |
| Nickel and Its Compounds | Good | 2015 | |
| Pentachlorophenol | Good | 2015 | |
| Simazine | Good | 2015 | |
| Trichlorobenzenes | Good | 2015 | |
| Trichloromethane | Good | 2015 | |
| Other Pollutants | Good | 2015 | |
| Aldrin, Dieldrin, Endrin & Isodrin | Good | 2015 | |
| Carbon Tetrachloride | Good | 2015 | |
| DDT Total | Good | 2015 | |
| Tetrachloroethylene | Good | 2015 | |
| Trichloroethylene | Good | 2015 | |
| para - para DDT | Good | 2015 |
Protected areas
| PA Name | Id | Directive | More information |
|---|---|---|---|
| Upper Thames (Leach to Evenlode) | SWSGZ4012 | Safeguard Zone | |
| River Thames | UKENRI17 | Urban Waste Water Treatment Directive | |
| THAMES (LEACH TO EVENLODE) NVZ | S482 | Nitrates Directive | |
| Filchhampstead Brook at Farmoor NVZ | S478 | Nitrates Directive | |
| Farmoor Reservoir | UKENLK168 | Urban Waste Water Treatment Directive | |
| Upper Thames Gravels | G84 | Nitrates Directive | |
| Wadley Stream (Source to Thames at Duxford) NVZ | S470 | Nitrates Directive | |
| Thames (Leach to Evenlode) | UKGB106039030333 | Drinking Water Protected Area |
Monitoring sites which have been used to classify this water body
Shows which sites were used for classification for which years within each cycle.