Skip to content
Welsh Government
Data Provider: Welsh Government National Statistics 13. River quality - Percentage of river lengths of good chemical or biological quality (ENV)

The table below shows what percentage of river lengths in Wales (surveyed as part of the general quality assessment (GQA) scheme) are classified as being of good, fair, poor or bad chemical/biological quality. Chemical quality is based on three indicators of pollution: biochemical oxygen demand, dissolved oxygen and ammonia.

Chart corresponding to the data table
None
[Collapse]AreaData do not exist for each indicator against all the time periods and areas available in this dataset.[Filtered]
-
[Collapse]Area 1[Filtered]
-
[Collapse]Area 2[Filtered]
-
[Collapse]Area 3[Filtered]
-
Area 4[Filter]
Measure1
PeriodData do not exist for each indicator against all the time periods and areas available in this dataset.[Filtered]
[Collapse]IndicatorEach series of indicators is related to an indicator heading against which no data are stored, but which are used to link to the relevant indicator report, and increase the readability of tables.[Filtered]
-
-
[Collapse]Indicator 1
-
-
[Collapse]Indicator 2
-
-
Indicator 3
Click here to sort1990Click here to sort1994Click here to sort1995Click here to sort1996Click here to sort1997Click here to sort1998Click here to sort1999Click here to sort2000Click here to sort2001Click here to sort2002Click here to sort2003Click here to sort2004Click here to sort2005Click here to sort2006Click here to sort2007Click here to sort2008Click here to sort2009
[Collapse]Percentage of river length of given chemical and biological water quality:Metadata for this indicator can be found in the relevant indicator report (see <a href=~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available~The data item is not yet available
Percentage of river length of given chemical and biological water quality:Metadata for this indicator can be found in the relevant indicator report (see <a href=[Collapse]- Good or fair chemical quality97.698.398.598.798.698.998.898.698.498.298.398.498.298.198.298.198.6
- Good or fair chemical quality[Expand]- Good chemical quality86.391.893.293.793.194.193.793.492.592.292.594.494.795.395.494.894.7
[Expand]- Fair chemical quality11.36.55.35.05.54.85.15.25.96.05.84.03.52.82.83.33.9
[Expand]- Poor chemical quality1.61.41.41.21.31.11.01.31.31.51.61.51.61.71.61.81.3
[Expand]- Bad chemical quality0.80.20.10.10.10.10.20.10.30.20.20.10.20.20.30.10.1
[Collapse]- Good or fair biological quality98.3..|The data item is not available99.7..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available98.8..|The data item is not available99.299.299.199.199.199.399.399.3
- Good or fair biological quality[Expand]- Good biological quality78.5..|The data item is not available87.0..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available78.3..|The data item is not available78.579.379.480.082.086.988.087.1
[Expand]- Fair biological quality19.8..|The data item is not available12.7..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available20.5..|The data item is not available20.719.919.719.117.112.411.312.2
[Expand]- Poor biological quality1.6..|The data item is not available0.2..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available1.0..|The data item is not available0.60.60.90.90.90.70.70.7
[Expand]- Bad biological quality0.2..|The data item is not available-The data item is not exactly zero, but estimated as zero or less than half the final digit shown..|The data item is not available..|The data item is not available..|The data item is not available..|The data item is not available0.2..|The data item is not available0.20.2-The data item is not exactly zero, but estimated as zero or less than half the final digit shown-The data item is not exactly zero, but estimated as zero or less than half the final digit shown-The data item is not exactly zero, but estimated as zero or less than half the final digit shown-The data item is not exactly zero, but estimated as zero or less than half the final digit shown-The data item is not exactly zero, but estimated as zero or less than half the final digit shown-The data item is not exactly zero, but estimated as zero or less than half the final digit shown

Metadata

Envt0001: State of the Environment Report Indicators

Knowledge & Analytical Services, Welsh Government

Last updated: 25 Jul 2012
Was added to StatsWales: 24 Jul 2008

Next update: Jul 2013

Source: See notes against each indicator for source details
Contact: stats.environment@wales.gsi.gov.uk

The State of the Environment report presents data on the indicators that monitor progress against the Welsh Government's Environment Strategy. The full set of data, analysis, and notes on all of the indicators are available here through our StatsWales website. On StatsWales, the indicators are presented in a series of online reports which are also linked to data tables which users can then manipulate and/or download.

The statistics come from a range of sources in Wales and across the UK, which are updated at different times and intervals. The StatsWales reports will be updated twice a year in July and December and these updates will be highlighted through a pre-announced headline statistics published on our website. A statistical bulletin showing the status of each indicator will be produced annually in July to provide a snapshot of progess across all the indicators.

The contribution of data and information by organisations which monitor the environment is gratefully acknowledged. Although most indicators are currently measured, some further work is planned to develop the other indicators and in some cases to identify more appropriate indicators, as indicated in the StatsWales reports.

The symbol '-' is used where the data is less than half the final digit shown. This may or may not be a real zero.

Unless otherwise stated, the data in these tables and indicator reports are classed as National Statistics.

State of the Environment

Name

Envt0001