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<p>The Environment Agency hold data for storm overflows, which includes combined sewer
overflows, storm discharges at sewage treatment inlet works, storm tank overflows
and storm overflows at pumping stations.</p><p> </p><p>As of 31 December 2019 the
numbers of storm overflows and percentage monitored by each Water and Sewerage Company
were:</p><p> </p><table><tbody><tr><td><p>Company</p></td><td><p>Total number of storm
overflow discharges</p></td><td><p>Number Monitored in 2019 (regulatory and non-regulatory)</p></td><td><p>Percentage
Monitored in 2019 (regulatory and non-regulatory)</p></td></tr><tr><td><p>Anglian
Water</p></td><td><p>1646</p></td><td><p>709</p></td><td><p>43</p></td></tr><tr><td><p>Dŵr
Cymru Welsh Water</p></td><td><p>2318</p></td><td><p>2110</p></td><td><p>91</p></td></tr><tr><td><p>Northumbrian
Water</p></td><td><p>1518</p></td><td><p>1487</p></td><td><p>98</p></td></tr><tr><td><p>Severn
Trent</p></td><td><p>2954</p></td><td><p>2308</p></td><td><p>78</p></td></tr><tr><td><p>Hafren
Dyfrdwy</p></td><td><p>59</p></td><td><p>48</p></td><td><p>81</p></td></tr><tr><td><p>South
West Water</p></td><td><p>1209</p></td><td><p>759</p></td><td><p>63</p></td></tr><tr><td><p>Southern
Water</p></td><td><p>986</p></td><td><p>986</p></td><td><p>100</p></td></tr><tr><td><p>Thames
Water</p></td><td><p>472</p></td><td><p>377</p></td><td><p>80</p></td></tr><tr><td><p>United
Utilities</p></td><td><p>2273</p></td><td><p>1649</p></td><td><p>73</p></td></tr><tr><td><p>Wessex
Water</p></td><td><p>1289</p></td><td><p>628</p></td><td><p>49</p></td></tr><tr><td><p>Yorkshire
Water</p></td><td><p>2246</p></td><td><p>2185</p></td><td><p>97</p></td></tr><tr><td><p>TOTALS</p></td><td><p>16970</p></td><td><p>13246</p></td><td><p>78</p></td></tr></tbody></table><p>
</p><p>The numbers monitored were supplied to the Environment Agency from the Water
and Sewerage Companies in England and Wales.</p><p> </p><p>Further monitoring is planned
for the period 2020 to 2025 with more than a 1,000 monitoring installations.</p>
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