Avon Water Water Body Moderate ecological status
Attributes Water Body ID GB107042011300 Water Body Type River Hydromorphological designation not designated artificial or heavily modified NGR SZ2688998316 Catchment area 44.753 km2 Surveillance Water Body No Length 24.756 km Catchment area 4475.329 ha Classifications Classification Item 2019 Ecological Moderate Biological quality elements Moderate Invertebrates High Macrophytes and Phytobenthos Combined Moderate Phytobenthos Sub Element Moderate Physico-chemical quality elements Moderate Ammonia (Phys-Chem) High Dissolved oxygen High Phosphate Moderate Temperature High pH High Hydromorphological Supporting Elements Supports good Hydrological Regime Supports good Morphology Supports good Specific pollutants High Triclosan High Chemical Fail Priority hazardous substances Fail Benzo(a)pyrene Good Benzo(b)fluoranthene Good Benzo(g-h-i)perylene Good Benzo(k)fluoranthene Good Di(2-ethylhexyl)phthalate (Priority hazardous) 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 Fail Nonylphenol Good Perfluorooctane sulphonate (PFOS) Good Polybrominated diphenyl ethers (PBDE) Fail Priority substances Good Cypermethrin (Priority) Good Fluoranthene Good Other Pollutants Does not require assessment
Why do all water bodies have a chemical status of fail?
Investigations into classification status Classification Element Cycle Year Status Outcome Macrophytes and Phytobenthos Combined 2 2014 Moderate Di(2-ethylhexyl)phthalate (Priority hazardous) 2 2013 Fail Uncertain there is a problem Phosphate 2 2013 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 Point source Private Sewage Treatment Domestic General Public Phosphate Details RNAG Diffuse source Transport Drainage Urban and transport Macrophytes and Phytobenthos Combined Details RNAG Point source Sewage discharge (continuous) Water Industry Phosphate Details RNAG Diffuse source Poor Livestock Management Agriculture and rural land management Macrophytes and Phytobenthos Combined Details RNAG Diffuse source Transport Drainage Urban and transport Phosphate Details RNAG Diffuse source Poor Livestock Management Agriculture and rural land management Macrophytes and Phytobenthos Combined Details RNAG Diffuse source Poor Livestock Management Agriculture and rural land management Phosphate Details RNAG Natural Drought No sector responsible Macrophytes and Phytobenthos Combined Details RNAG measures delivered to address reason, awaiting recovery Not applicable No sector responsible Mercury and Its Compounds Details RNAG measures delivered to address reason, awaiting recovery Not applicable No sector responsible Polybrominated diphenyl ethers (PBDE) Details RNAG Point source Private Sewage Treatment Domestic General Public Macrophytes and Phytobenthos Combined Details RNAG Point source Sewage discharge (continuous) Water Industry Macrophytes and Phytobenthos Combined 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 3 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 2 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 2 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 4 0 0 3 0
Objectives Classification Item Status Year Reasons Ecological Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Biological quality elements Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Invertebrates Good 2015 Macrophytes and Phytobenthos Combined Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Physico-chemical quality elements Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Ammonia (Phys-Chem) Good 2015 Dissolved oxygen Good 2015 Phosphate Good 2027 - Low confidence Disproportionately expensive: Disproportionate burdens Temperature Good 2015 pH Good 2015 Hydromorphological Supporting Elements Supports good 2015 Hydrological Regime Supports good 2015 Supporting elements (Surface Water) Not assessed 2015 Specific pollutants High 2015 Triclosan High 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 Benzo(b)fluoranthene Good 2015 Benzo(g-h-i)perylene Good 2015 Benzo(k)fluoranthene Good 2015 Di(2-ethylhexyl)phthalate (Priority hazardous) 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 2040 Natural conditions: Chemical status recovery time Nonylphenol Good 2015 Perfluorooctane sulphonate (PFOS) Good 2015 Polybrominated diphenyl ethers (PBDE) Good 2063 Natural conditions: Chemical status recovery time Priority substances Good 2015 Cypermethrin (Priority) Good 2015 Fluoranthene Good 2015 Other Pollutants Does not require assessment 2015
Protected areas PA Name Id Directive More information Solent Maritime UK0030059 Special Area of Conservation Natural England Solent & Southampton Water UK9011061 Special Protection Area Natural England Solent & Southampton Water UK11063 Ramsar Site Natural England Pennington UKSW41 Shellfish Water Directive The New Forest UK0012557 Special Area of Conservation Natural England New Forest UK11047 Ramsar Site Natural England Avon Water NVZ S525 Nitrates Directive
Monitoring sites which have been used to classify this water body Shows which sites were used for classification for which years within
each cycle.
Monitoring Site Cycle 1 Cycle 2 Cycle 3 LYMORE TRIB G0004228 2009 2015, 2016, 2019 2019 AVON WTR EFFORD MILL G0004218 2009, 2011, 2014, 2012, 2010, 2013 2014, 2015, 2013, 2016, 2019 2019 ARNEWOOD MANOR G0004225 2009 2015, 2016, 2019 2019 160871 160871 2014, 2016, 2015 43229 43229 2012, 2010, 2013, 2011, 2014 2019, 2013, 2014 2019 41985 41985 2010, 2009, 2011 42055 42055 2010, 2009, 2011 43209 43209 2011