Lower River Carnon Water Body
Poor ecological status
Get Lower River Carnon data
Attributes
- Water Body IDGB108048001231
- Water Body TypeRiver
- Hydromorphological designationnot designated artificial or heavily modified
- NGRSW7718441813
- Catchment area10.298 km2
- Surveillance Water BodyYes
- Catchment area1029.773 ha
- Length5.03 km
Classifications
| Classification Item | 2019 | 2022 |
|---|---|---|
| Ecological | Poor | Poor |
| Biological quality elements | Poor | Poor |
| Invertebrates | Poor | Poor |
| Macrophytes and Phytobenthos Combined | High | High |
| Macrophytes Sub Element | High | High |
| Phytobenthos Sub Element | High | High |
| Physico-chemical quality elements | Moderate | Moderate |
| Acid Neutralising Capacity | High | High |
| Ammonia (Phys-Chem) | Moderate | Moderate |
| Dissolved oxygen | High | High |
| Phosphate | Moderate | Moderate |
| Temperature | High | High |
| pH | Moderate | Moderate |
| Hydromorphological Supporting Elements | Supports good | Supports good |
| Hydrological Regime | Supports good | Supports good |
| Specific pollutants | Moderate | Moderate |
| Arsenic | Moderate | Moderate |
| Chlorothalonil | High | High |
| Copper | Moderate | Moderate |
| Iron | High | High |
| Manganese | High | High |
| Pendimethalin | High | High |
| Zinc | Moderate | Moderate |
| Chemical | Fail | Does not require assessment |
| Priority hazardous substances | Fail | Does not require assessment |
| Benzo(a)pyrene | Good | |
| Cadmium and Its Compounds | Fail | |
| 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 | Fail | |
| Perfluorooctane sulphonate (PFOS) | Good | |
| Polybrominated diphenyl ethers (PBDE) | Fail | |
| Quinoxyfen | Good | |
| Priority substances | Fail | Does not require assessment |
| Aclonifen | Good | |
| Alachlor | Good | |
| Bifenox | Good | |
| Cybutryne | Good | |
| Cypermethrin (Priority) | Good | |
| Dichlorvos (Priority) | Good | |
| Fluoranthene | Good | |
| Lead and Its Compounds | Good | |
| Nickel and Its Compounds | Fail | |
| Other Pollutants | Good | Does not require assessment |
| Aldrin, Dieldrin, Endrin & Isodrin | Good | |
| para - para DDT | Good |
Investigations into classification status
| Classification Element | Cycle | Year | Status | Outcome |
|---|---|---|---|---|
| Lead and Its Compounds | 2 | 2013 | Fail | Quite certain there is a problem |
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 | Abandoned mine | Mining and quarrying | Cadmium and Its Compounds | Details |
| RNAG | Point source | Sewage discharge (intermittent) | Water Industry | Phosphate | Details |
| RNAG | Diffuse source | Abandoned mine | Mining and quarrying | Nickel and Its Compounds | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Cadmium and Its Compounds | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Zinc | Details |
| RNAG | Point source | Sewage discharge (continuous) | Water Industry | Phosphate | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Nickel and Its Compounds | Details |
| RNAG | Diffuse source | Abandoned mine | Mining and quarrying | Zinc | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | pH | Details |
| RNAG | Natural | Natural mineralisation | No sector responsible | Nickel and Its Compounds | Details |
| RNAG | Natural | Natural mineralisation | No sector responsible | Zinc | Details |
| RNAG | Point source | Sewage discharge (continuous) | Water Industry | Ammonia (Phys-Chem) | Details |
| RNAG | Natural | Natural mineralisation | No sector responsible | Copper | Details |
| RNAG | Diffuse source | Groundwater | Waste treatment and disposal | Ammonia (Phys-Chem) | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Copper | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Invertebrates | Details |
| RNAG | Diffuse source | Abandoned mine | Mining and quarrying | Copper | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Invertebrates | Details |
| RNAG | Diffuse source | Abandoned mine | Mining and quarrying | Arsenic | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Invertebrates | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Arsenic | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Invertebrates | Details |
| RNAG | Natural | Natural mineralisation | No sector responsible | Cadmium and Its Compounds | Details |
| RNAG | Diffuse source | Poor Livestock Management | Agriculture and rural land management | Phosphate | Details |
| RNAG | Point source | Abandoned mine | Mining and quarrying | Invertebrates | Details |
| RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Polybrominated diphenyl ethers (PBDE) | Details |
| RNAG | measures delivered to address reason, awaiting recovery | Not applicable | No sector responsible | Mercury and Its Compounds | 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 | 16 |
| Navigation | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Urban and transport | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Water Industry | 0 | 2 | 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 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Total | 0 | 2 | 0 | 0 | 0 | 1 | 16 |
Objectives
| Classification Item | Status | Year | Reasons |
|---|---|---|---|
| Ecological | Poor | 2021 | Disproportionately expensive: Disproportionate burdens; Technically infeasible: No known technical solution is available |
| Biological quality elements | Poor | 2021 | Disproportionately expensive: Disproportionate burdens; Technically infeasible: No known technical solution is available |
| Invertebrates | Poor | 2021 | Disproportionately expensive: Disproportionate burdens; Technically infeasible: No known technical solution is available |
| Macrophytes and Phytobenthos Combined | Good | 2015 | |
| Physico-chemical quality elements | Moderate | 2015 | Disproportionately expensive: Disproportionate burdens; Technically infeasible: No known technical solution is available |
| Acid Neutralising Capacity | Good | 2015 | |
| Ammonia (Phys-Chem) | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| Dissolved oxygen | Good | 2015 | |
| Phosphate | Good | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| Temperature | Good | 2015 | |
| pH | Moderate | 2021 | Disproportionately expensive: Disproportionate burdens; Technically infeasible: No known technical solution is available |
| Hydromorphological Supporting Elements | Supports good | 2015 | |
| Hydrological Regime | Supports good | 2015 | |
| Supporting elements (Surface Water) | Not assessed | 2015 | |
| Specific pollutants | High | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| Arsenic | High | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| Chlorothalonil | High | 2015 | |
| Copper | High | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| Iron | High | 2015 | |
| Manganese | High | 2015 | |
| Pendimethalin | High | 2015 | |
| Zinc | High | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| Chemical | Good | 2063 | Disproportionately expensive: Disproportionate burdens; Natural conditions: Chemical status recovery time |
| Priority hazardous substances | Good | 2063 | Disproportionately expensive: Disproportionate burdens; Natural conditions: Chemical status recovery time |
| 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 | 2027 - Low confidence | Disproportionately expensive: Disproportionate burdens |
| 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 | 2040 | Natural conditions: Chemical status recovery time |
| Perfluorooctane sulphonate (PFOS) | Good | 2015 | |
| Polybrominated diphenyl ethers (PBDE) | Good | 2063 | Natural conditions: Chemical status recovery time |
| Quinoxyfen | Good | 2015 | |
| Priority substances | Good | 2033 | Disproportionately expensive: Disproportionate burdens |
| Aclonifen | Good | 2015 | |
| Alachlor | Good | 2015 | |
| Bifenox | Good | 2015 | |
| Cybutryne | Good | 2015 | |
| Cypermethrin (Priority) | Good | 2015 | |
| Dichlorvos (Priority) | Good | 2015 | |
| Fluoranthene | Good | 2015 | |
| Lead and Its Compounds | Good | 2015 | |
| Nickel and Its Compounds | Good | 2033 | Disproportionately expensive: Disproportionate burdens |
| Other Pollutants | Good | 2015 | |
| Aldrin, Dieldrin, Endrin & Isodrin | Good | 2015 | |
| para - para DDT | Good | 2015 |
Protected areas
| PA Name | Id | Directive | More information |
|---|---|---|---|
| Truro, Tresillian and Falmouth | ET5 | Nitrates Directive | |
| Carrine Common | UK0012795 | Special Area of Conservation | 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.