Lower Brent Water Body

Moderate ecological status

Attributes

  • Water Body IDGB106039023590
  • Water Body TypeRiver
  • Hydromorphological designationheavily modified
  • NGRTQ1599182665
  • Catchment area71.827 km2
  • Surveillance Water BodyYes
  • Length20.475 km
  • Catchment area7182.744 ha

Classifications

Classification Item2019
EcologicalModerate
Biological quality elementsBad
FishPoor
InvertebratesBad
Macrophytes and Phytobenthos CombinedGood
Macrophytes Sub ElementModerate
Phytobenthos Sub ElementGood
Physico-chemical quality elementsModerate
Acid Neutralising CapacityHigh
Ammonia (Phys-Chem)Moderate
Dissolved oxygenBad
PhosphatePoor
TemperatureHigh
pHHigh
Hydromorphological Supporting ElementsSupports good
Hydrological RegimeSupports good
Supporting elements (Surface Water)Moderate
Mitigation Measures AssessmentModerate or less
Specific pollutantsHigh
ChlorothalonilHigh
CopperHigh
PendimethalinHigh
TriclosanHigh
ChemicalFail
Priority hazardous substancesFail
Benzo(a)pyreneGood
Benzo(b)fluorantheneGood
Benzo(g-h-i)peryleneFail
Benzo(k)fluorantheneGood
Dioxins and dioxin-like compoundsGood
Heptachlor and cis-Heptachlor epoxideGood
Hexabromocyclododecane (HBCDD)Good
HexachlorobenzeneGood
HexachlorobutadieneGood
HexachlorocyclohexaneGood
Mercury and Its CompoundsGood
NonylphenolGood
Perfluorooctane sulphonate (PFOS)Good
Polybrominated diphenyl ethers (PBDE)Fail
QuinoxyfenGood
Tributyltin CompoundsGood
Priority substancesGood
AclonifenGood
AlachlorGood
BifenoxGood
CybutryneGood
Cypermethrin (Priority)Good
Dichlorvos (Priority)Good
FluorantheneGood
TerbutrynGood
Other PollutantsDoes not require assessment

Why do all water bodies have a chemical status of fail?

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 TypeSWMIActivityCategoryClassification ElementMore information
RNAGPhysical modificationUrbanisation - urban developmentUrban and transportFishDetails
RNAGPhysical modificationInland boating and structuresNavigationFishDetails
RNAGPhysical modificationFlood protection - structuresUrban and transportFishDetails
RNAGPoint sourceMisconnectionsDomestic General PublicInvertebratesDetails
RNAGDiffuse sourceUrbanisation - urban developmentUrban and transportInvertebratesDetails
RNAGDiffuse sourceUrbanisation - urban developmentUrban and transportMacrophytes and Phytobenthos CombinedDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryMacrophytes and Phytobenthos CombinedDetails
RFDPoint sourceMisconnectionsDomestic General PublicInvertebratesDetails
RNAGDiffuse sourceUrbanisation - urban developmentUrban and transportDissolved oxygenDetails
RFDDiffuse sourceUrbanisation - urban developmentUrban and transportInvertebratesDetails
RNAGPoint sourceMisconnectionsDomestic General PublicMacrophytes and Phytobenthos CombinedDetails
RNAGPhysical modificationUrbanisation - urban developmentUrban and transportInvertebratesDetails
RNAGPhysical modificationOther (not in list, must add details in comments)Urban and transportMitigation Measures AssessmentDetails
RNAGDiffuse sourceUrbanisation - urban developmentUrban and transportAmmonia (Phys-Chem)Details
RNAGPhysical modificationInland boating and structuresNavigationInvertebratesDetails
RNAGUnknown (pending investigation)Unknown (pending investigation)Sector under investigationBenzo(g-h-i)peryleneDetails
RNAGPhysical modificationFlood protection - structuresUrban and transportInvertebratesDetails
RNAGPhysical modificationOther (not in list, must add details in comments)Local and Central GovernmentMitigation Measures AssessmentDetails
RNAGPoint sourceMisconnectionsDomestic General PublicAmmonia (Phys-Chem)Details
RNAGPhysical modificationOther (not in list, must add details in comments)RecreationMitigation Measures AssessmentDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryAmmonia (Phys-Chem)Details
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGPoint sourceSewage discharge (intermittent)Water IndustryPhosphateDetails
RNAGPoint sourceMisconnectionsDomestic General PublicPhosphateDetails
RNAGDiffuse sourceUrbanisation - urban developmentUrban and transportPhosphateDetails
RNAGPoint sourceUse of restricted substanceNavigationTributyltin CompoundsDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryDissolved oxygenDetails
RNAGDiffuse sourceContaminated water body bed sedimentsUrban and transportTributyltin CompoundsDetails
RNAGPoint sourceMisconnectionsDomestic General PublicDissolved oxygenDetails

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 issuePhysical modificationsPollution from waste waterPollution from towns, cities and transportChanges to the natural flow and level of waterInvasive non-native speciesPollution from rural areasPollution from abandoned mines
Agriculture and rural land management0000000
Industry0000000
Mining and quarrying0000000
Navigation2000000
Urban and transport5040000
Water Industry0300000
Local & central government1000000
Domestic general public0040000
Recreation1000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000000
Sector under investigation0000000
Total9380000

Objectives

Classification ItemStatusYearReasons
EcologicalGood2027 - Low confidenceDisproportionately 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 elementsModerate2027 - Low confidenceDisproportionately 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
FishModerate2027 - Low confidenceDisproportionately 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
InvertebratesModerate2027 - Low confidenceDisproportionately 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 CombinedGood2015
Physico-chemical quality elementsGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Acid Neutralising CapacityGood2015
Ammonia (Phys-Chem)Good2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Dissolved oxygenGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
PhosphateGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
TemperatureGood2015
pHGood2015
Hydromorphological Supporting ElementsSupports good2015
Hydrological RegimeSupports good2015
Supporting elements (Surface Water)Good2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Mitigation Measures AssessmentGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens
Specific pollutantsHigh2015
ChlorothalonilHigh2015
CopperHigh2015
PendimethalinHigh2015
TriclosanHigh2015
ChemicalGood2063Natural conditions: Chemical status recovery time;
Technically infeasible: No known technical solution is available
Priority hazardous substancesGood2063Natural conditions: Chemical status recovery time;
Technically infeasible: No known technical solution is available
Benzo(a)pyreneGood2015
Benzo(b)fluorantheneGood2015
Benzo(g-h-i)peryleneGood2033Technically infeasible: No known technical solution is available
Benzo(k)fluorantheneGood2015
Dioxins and dioxin-like compoundsGood2015
Heptachlor and cis-Heptachlor epoxideGood2015
Hexabromocyclododecane (HBCDD)Good2015
HexachlorobenzeneGood2015
HexachlorobutadieneGood2015
HexachlorocyclohexaneGood2015
Mercury and Its CompoundsGood2015
NonylphenolGood2015
Perfluorooctane sulphonate (PFOS)Good2015
Polybrominated diphenyl ethers (PBDE)Good2063Natural conditions: Chemical status recovery time
QuinoxyfenGood2015
Tributyltin CompoundsGood2015
Priority substancesGood2015
AclonifenGood2015
AlachlorGood2015
BifenoxGood2015
CybutryneGood2015
Cypermethrin (Priority)Good2015
Dichlorvos (Priority)Good2015
FluorantheneGood2015
TerbutrynGood2015
Other PollutantsDoes not require assessment2015

Protected areas

No data to show

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 SiteCycle 1Cycle 2Cycle 3
34091 340912009, 2014, 2012, 2010, 2013, 20112016, 2014, 2015, 2013
G.U.C. UPSTREAM OF LOCK 97 PGUR00212009
82178 821782013, 2011
G.U.C. AT EALING ROAD, ALPERTON PGPR00102009
BRENT AT UXBRIDGE ROAD, HANWELL PBRR001120092015, 2019, 20162019
BRENT/TOKYNGTON PARK/ 328692012, 2010, 2013, 2011, 20142019, 2015, 2013, 20142019
34069 340692009, 2014, 2013, 2011, 2010, 20122016, 2019, 2014, 20152019
BRENT UPSTREAM OF WESTERN AVENUE, ALPERT PBRR00152012, 2010, 2014, 2009, 2013, 20112016, 2015, 2014, 2019, 20132019
34006 340062009
33323 333232009
34007 340072014, 2012, 2009, 2013, 2011, 20102016, 2019, 2014, 2015, 20132019
BRENT AT NEASDEN LANE, WEMBLEY PBRR00072009, 20142015, 2019, 2016, 20142019
BRENT/GREENFORD BRIDGE/ 90602012, 2010, 2009, 2013, 2011, 20142019, 2015, 2013, 2016, 20142019
BRENT/HANWELL BRIDGE/ 93502012, 2010, 2009, 2013, 2011, 20142019, 2015, 2013, 2016, 20142019
BRENT / G.U.C. AT LOCK 100, BRENTFORD PBRR00182016, 2015

Downstream water bodies