North Wey at Alton Water Body

Moderate ecological status

Attributes

  • Water Body IDGB106039017800
  • Water Body TypeRiver
  • Hydromorphological designationheavily modified
  • NGRSU7204739286
  • Catchment area54.231 km2
  • Surveillance Water BodyNo
  • Length2.802 km
  • Catchment area5423.05 ha

Classifications

Classification Item2019
EcologicalModerate
Biological quality elementsGood
InvertebratesGood
Macrophytes and Phytobenthos CombinedGood
Macrophytes Sub ElementGood
Physico-chemical quality elementsModerate
Ammonia (Phys-Chem)High
Dissolved oxygenModerate
PhosphateGood
TemperatureHigh
pHHigh
Hydromorphological Supporting ElementsSupports good
Hydrological RegimeDoes not support good
Supporting elements (Surface Water)Moderate
Mitigation Measures AssessmentModerate or less
Specific pollutantsHigh
ArsenicHigh
Chromium (VI)High
CopperHigh
ZincHigh
ChemicalFail
Priority hazardous substancesFail
Benzo(a)pyreneGood
Dioxins and dioxin-like compoundsGood
Heptachlor and cis-Heptachlor epoxideGood
Hexabromocyclododecane (HBCDD)Good
HexachlorobenzeneGood
HexachlorobutadieneGood
Mercury and Its CompoundsGood
Perfluorooctane sulphonate (PFOS)Good
Polybrominated diphenyl ethers (PBDE)Fail
Priority substancesGood
Cypermethrin (Priority)Good
FluorantheneGood
Nickel and Its CompoundsGood
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
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)Details
RNAGFlowGroundwater abstractionWater IndustryDissolved oxygenDetails
RNAGPoint sourceSewage discharge (intermittent)Water IndustryDissolved oxygenDetails
RNAGPhysical modificationUrbanisation - urban developmentUrban and transportDissolved oxygenDetails
RNAGPhysical modificationOther (not in list, must add details in comments)Urban and transportMitigation Measures AssessmentDetails
RNAGFlowGroundwater abstractionWater IndustryHydrological RegimeDetails

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
Navigation0000000
Urban and transport1000000
Water Industry0001000
Local & central government0000000
Domestic general public0000000
Recreation0000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000000
Sector under investigation0000000
Total1001000

Objectives

Classification ItemStatusYearReasons
EcologicalGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline
Biological quality elementsGood2021Disproportionately expensive: Disproportionate burdens
InvertebratesGood2015
Macrophytes and Phytobenthos CombinedGood2021Disproportionately expensive: Disproportionate burdens
Physico-chemical quality elementsGood2015
Ammonia (Phys-Chem)Good2015
Dissolved oxygenGood2015
PhosphateGood2015
TemperatureGood2015
pHGood2015
Hydromorphological Supporting ElementsSupports good2015
Hydrological RegimeDoes not support good2015Disproportionately expensive: Unfavourable balance of costs and benefits;
Technically infeasible: No known technical solution is available
Supporting elements (Surface Water)Good2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline
Mitigation Measures AssessmentGood2027 - Low confidenceDisproportionately expensive: Disproportionate burdens;
Technically infeasible: Practical technical constraints prevent implementation of the measure by an earlier deadline
Specific pollutantsHigh2015
ArsenicHigh2015
Chromium (VI)High2015
CopperHigh2015
ZincHigh2015
ChemicalGood2063Natural conditions: Chemical status recovery time
Priority hazardous substancesGood2063Natural conditions: Chemical status recovery time
Benzo(a)pyreneGood2015
Dioxins and dioxin-like compoundsGood2015
Heptachlor and cis-Heptachlor epoxideGood2015
Hexabromocyclododecane (HBCDD)Good2015
HexachlorobenzeneGood2015
HexachlorobutadieneGood2015
Mercury and Its CompoundsGood2015
Perfluorooctane sulphonate (PFOS)Good2015
Polybrominated diphenyl ethers (PBDE)Good2063Natural conditions: Chemical status recovery time
Priority substancesGood2015
Cypermethrin (Priority)Good2015
FluorantheneGood2015
Nickel and Its CompoundsGood2015
Other PollutantsDoes not require assessment2015

Protected areas

PA NameIdDirectiveMore information
Lower Thames (Cookham Egham Teddington)SWSGZ4016Safeguard Zone
North Wey (Alton to Tilford) NVZS678Nitrates Directive
Kingsclere and GreywellG145Nitrates Directive
WeySWSGZ4015Safeguard Zone

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
WEY ( NORTHERN ARM ) ABOVE CAKER STREAM PWER00912010, 2014, 2009, 2013, 2012, 20112015, 2014, 2013, 2016
156302 15630220142016, 2019, 2014, 20152019
35571 355712010, 2011, 2013, 20142014, 2013, 2016, 2015, 20192019
34351 343512011

Upstream water bodies

    Downstream water bodies