Hoe Stream (Pirbright to River Wey confluence at Woking) Water Body

Moderate ecological status

Attributes

  • Water Body IDGB106039017900
  • Water Body TypeRiver
  • Hydromorphological designationnot designated artificial or heavily modified
  • NGRSU9987456695
  • Catchment area3590.749 ha
  • Length14.662 km
  • Catchment area35.907 km2
  • Surveillance Water BodyNo

Classifications

Classification Item20192022
EcologicalModerateModerate
Biological quality elementsModerateModerate
FishGoodGood
InvertebratesHighHigh
Macrophytes and Phytobenthos CombinedModerateModerate
Macrophytes Sub ElementModerateModerate
Phytobenthos Sub ElementModerateModerate
Physico-chemical quality elementsModerateModerate
Ammonia (Phys-Chem)HighHigh
Dissolved oxygenGoodHigh
PhosphateModeratePoor
TemperatureHighHigh
pHHighHigh
Hydromorphological Supporting ElementsSupports goodSupports good
Hydrological RegimeSupports goodHigh
MorphologySupports goodSupports good
Specific pollutantsHighHigh
IronHighHigh
TriclosanHighHigh
ChemicalFailDoes not require assessment
Priority hazardous substancesFailDoes not require assessment
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)Fail
Polybrominated diphenyl ethers (PBDE)Fail
Priority substancesFailDoes not require assessment
Cypermethrin (Priority)Fail
FluorantheneGood
Other PollutantsDoes not require assessmentDoes 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
RNAGPoint sourceSewage discharge (continuous)Water IndustryPhosphateDetails
RNAGPoint sourceSewage discharge (continuous)Water IndustryMacrophytes and Phytobenthos CombinedDetails
RNAGUnknown (pending investigation)Unknown (pending investigation)Sector under investigationPerfluorooctane sulphonate (PFOS)Details
RNAGmeasures delivered to address reason, awaiting recoveryNot applicableNo sector responsiblePolybrominated diphenyl ethers (PBDE)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 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 transport0000000
Water Industry0200000
Local & central government0000000
Domestic general public0000000
Recreation0000000
Waste treatment and disposal0000000
Other0000000
No sector responsible0000000
Sector under investigation0000000
Total0200000

Objectives

Classification ItemStatusYearReasons
EcologicalGood2039Natural conditions: Ecological recovery time;
Technically infeasible: No known technical solution is available
Biological quality elementsGood2039Natural conditions: Ecological recovery time
FishGood2015
InvertebratesGood2015
Macrophytes and Phytobenthos CombinedGood2039Natural conditions: Ecological recovery time
Physico-chemical quality elementsGood2027Technically infeasible: No known technical solution is available
Ammonia (Phys-Chem)Good2015
Dissolved oxygenGood2015
PhosphateGood2027Technically infeasible: No known technical solution is available
TemperatureGood2015
pHGood2015
Hydromorphological Supporting ElementsSupports good2015
Hydrological RegimeSupports good2015
Supporting elements (Surface Water)Not assessed2015
Specific pollutantsHigh2015
IronHigh2015
TriclosanHigh2015
ChemicalGood2063Natural conditions: Chemical status recovery time;
Technically infeasible: Cause of adverse impact unknown;
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
Dioxins and dioxin-like compoundsGood2015
Heptachlor and cis-Heptachlor epoxideGood2015
Hexabromocyclododecane (HBCDD)Good2015
HexachlorobenzeneGood2015
HexachlorobutadieneGood2015
Mercury and Its CompoundsGood2015
Perfluorooctane sulphonate (PFOS)Good2039Technically infeasible: No known technical solution is available
Polybrominated diphenyl ethers (PBDE)Good2063Natural conditions: Chemical status recovery time
Priority substancesGood2039Technically infeasible: Cause of adverse impact unknown
Cypermethrin (Priority)Good2039Technically infeasible: Cause of adverse impact unknown
FluorantheneGood2015
Other PollutantsDoes not require assessment2015

Protected areas

PA NameIdDirectiveMore information
Lower Thames (Cookham Egham Teddington)SWSGZ4016Safeguard Zone
WeySWSGZ4015Safeguard Zone
Thursley, Ash, Pirbright & ChobhamUK0012793Special Area of ConservationNatural 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.

Monitoring SiteCycle 1Cycle 2Cycle 3
35942 359422009
RIVER WEY/WEY COMBINED/HOE STREAM/OLD WOKING CRICKET CLUB/ 378672013, 2014, 20122013, 2016, 2019, 2014, 20152019
34653 346532014, 2013, 2012, 2011, 2010, 20092015, 2013, 2016, 2014
HOE STREAM AT NEWARK PRIORY PWER03232015, 2016
157577 1575772014, 2012, 20132015, 2016, 2014
157489 1574892014, 2012, 2013
RIVER WEY/WEY COMBINED/HOE STREAM/MAYFORD MEADOWS/ 378662013, 2014, 20122013, 2016, 2019, 2014, 20152019
STANFORD BROOK AT RICKFORD MILL PWER00162013, 2011, 2014, 2012, 2010, 20092013, 2015, 2016, 2014, 20192022, 2019
RIVER WEY/WEY COMBINED/NEWARK PRIORY/ 103892013, 2012, 2009
STANFORD BROOK AT SMARTS HEATH LANE PWER01292014, 2012, 2013, 20092015, 2014, 2013, 2016