Oss Mere Water Body
Moderate ecological status
Get Oss Mere data
Attributes
- Water Body IDGB31234545
- Water Body TypeLake
- Hydromorphological designationheavily modified
- NGRSJ5661343929
- Altitude105 m
- Mean depth1.2 m
- Surveillance Water BodyNo
- Surface area0.105 km2
- Surface area10.52 ha
- Catchment area82.25 ha
Classifications
Classification Item | 2019 | 2022 |
---|---|---|
Ecological | Moderate | Moderate |
Biological quality elements | Moderate | Moderate |
Macrophytes and Phytobenthos Combined | Moderate | Moderate |
Macrophytes Sub Element | Moderate | Moderate |
Phytoplankton | High | Good |
Physico-chemical quality elements | Moderate | Moderate |
Salinity | High | High |
Total Nitrogen | Moderate | Moderate |
Total Phosphorus | Poor | Bad |
Hydromorphological Supporting Elements | Supports good | Supports good |
Hydrological Regime | High | High |
Supporting elements (Surface Water) | Moderate | Moderate |
Expert Judgement | Moderate | Moderate |
Mitigation Measures Assessment | Moderate or less | Moderate or less |
Chemical | Fail | Does not require assessment |
Priority hazardous substances | Fail | Does not require assessment |
Benzo(a)pyrene | Good | |
Dioxins and dioxin-like compounds | Good | |
Heptachlor and cis-Heptachlor epoxide | Good | |
Hexabromocyclododecane (HBCDD) | Good | |
Hexachlorobenzene | Good | |
Hexachlorobutadiene | Good | |
Mercury and Its Compounds | Fail | |
Perfluorooctane sulphonate (PFOS) | Good | |
Polybrominated diphenyl ethers (PBDE) | Fail | |
Priority substances | Good | Does not require assessment |
Fluoranthene | Good | |
Other Pollutants | Does not require assessment | Does not require assessment |
Investigations into classification status
No data to show
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 pesticide management | Agriculture and rural land management | Phytoplankton | Details |
RNAG | Point source | Farm/site infrastructure | Agriculture and rural land management | Total Phosphorus | Details |
RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Mercury and Its Compounds | Details |
RNAG | Diffuse source | Poor soil management | Agriculture and rural land management | Total Phosphorus | Details |
RNAG | Diffuse source | Poor nutrient management | Agriculture and rural land management | Total Phosphorus | Details |
RNAG | Diffuse source | Poor Livestock Management | Agriculture and rural land management | Total Phosphorus | Details |
RNAG | Diffuse source | Poor pesticide management | Agriculture and rural land management | Total Phosphorus | Details |
RNAG | Point source | Farm/site infrastructure | Agriculture and rural land management | Phytoplankton | Details |
RNAG | Diffuse source | Poor Livestock Management | Agriculture and rural land management | Macrophytes and Phytobenthos Combined | Details |
RNAG | Diffuse source | Poor soil management | Agriculture and rural land management | Phytoplankton | Details |
RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Polybrominated diphenyl ethers (PBDE) | Details |
RNAG | Diffuse source | Poor nutrient management | Agriculture and rural land management | Phytoplankton | Details |
RNAG | Physical modification | Other (not in list, must add details in comments) | Sector under investigation | Mitigation Measures Assessment | Details |
RNAG | Diffuse source | Poor Livestock Management | Agriculture and rural land management | Phytoplankton | 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 | 5 | 0 |
Industry | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Mining and quarrying | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Navigation | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Urban and transport | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Water Industry | 0 | 0 | 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 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Waste treatment and disposal | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Other | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
No sector responsible | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Sector under investigation | 1 | 0 | 0 | 0 | 0 | 0 | 0 |
Total | 1 | 0 | 0 | 0 | 0 | 5 | 0 |
Objectives
Classification Item | Status | Year | Reasons |
---|---|---|---|
Ecological | Moderate | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens; Good status prevented by A/HMWB designated use: Action to get biological element to good would have significant adverse impact on use |
Biological quality elements | Moderate | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens; Good status prevented by A/HMWB designated use: Action to get biological element to good would have significant adverse impact on use |
Macrophytes and Phytobenthos Combined | Moderate | 2015 | Good status prevented by A/HMWB designated use: Action to get biological element to good would have significant adverse impact on use |
Phytoplankton | Moderate | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens; Good status prevented by A/HMWB designated use: Action to get biological element to good would have significant adverse impact on use |
Physico-chemical quality elements | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Salinity | Good | 2015 | |
Total Nitrogen | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Total Phosphorus | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Hydromorphological Supporting Elements | Supports good | 2015 | |
Hydrological Regime | Supports good | 2015 | |
Supporting elements (Surface Water) | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Expert Judgement | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Mitigation Measures Assessment | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
Specific pollutants | Not assessed | 2015 | |
Chemical | Good | 2063 | Natural conditions: Chemical status recovery time |
Priority hazardous substances | Good | 2063 | Natural conditions: Chemical status recovery time |
Benzo(a)pyrene | 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 | |
Mercury and Its Compounds | Good | 2040 | Natural conditions: Chemical status recovery time |
Perfluorooctane sulphonate (PFOS) | Good | 2015 | |
Polybrominated diphenyl ethers (PBDE) | Good | 2063 | Natural conditions: Chemical status recovery time |
Priority substances | Good | 2015 | |
Fluoranthene | Good | 2015 | |
Other Pollutants | Does not require assessment | 2015 |
Protected areas
PA Name | Id | Directive | More information |
---|---|---|---|
River Weaver (Dane to Frodsham) NVZ | S636 | Nitrates Directive | |
Midland Meres & Mosses Phase 2 | UK11080 | Ramsar Site | Natural England |
Monitoring sites which have been used to classify this water body
Shows which sites were used for classification for which years within each cycle.