Severn Trent cautioned for supplying water 'unfit for human consumption'
Severn Trent Water has been cautioned by the Drinking Water Inspectorate (DWI) for supplying water that was 'unfit for human consumption'.
The caution relates to an event in March 2016 when consumers in 3,700 properties were advised by Severn Trent not to use their water for 26 hours due to elevated levels of chlorine.
The event occurred at Castle Donington Service Reservoir, Derbyshire, and involved the contents of a sodium hypochlorite storage tank draining into the inlet main to the service reservoir. The DWI’s investigation has concluded that this serious event “was avoidable, and that there were a number of missed opportunities to identify and rectify the problem before the event”.
Severn Trent, which admitted supplying water unfit for human consumption under Section 70 of the Water Industry Act (1991), isolated the chlorine dosing equipment at the service reservoir, and flushed the supply network to remove the affected water. However, the incident resulted in the supply of unwholesome water to some consumers, some of whom rejected the water supplied to them.
The company has replaced the chlorine dosing equipment at the service reservoir site to prevent a recurrence of the event. It has also audited more than 190 similar secondary chlorine dosing rigs currently operational across its asset base, and has instigated corrective actions as necessary.
Other actions taken to further mitigate the risk of a similar event occurring at other sites include a competency assessment of all staff involved in operational activities at service reservoirs and at chlorine booster stations; a review of chlorine booster station alarm settings and telemetry stations for reliability; changes in procedures; a review of the use of GIS systems to more accurately and rapidly identify areas affected in any future event scenario; and a review of alternative supply management arrangements.
- HLG wins contract for Qatar ‘mega reservoir' The Habtoor Leighton Group (HLG) has been awarded a US$608M contract for the construction of Mega Reservoir Primary... Read More >
- Ofwat allows Severn Trent to focus on key critical issues in price review A proposal by Severn Trent Water to limit its response to the draft determinations to just a handful of critical issues... Read More >
- Severn Trent spends £35M for phosphorus removal at Finham STW Severn Trent is investing £35M at its Finham Sewage Treatment Works, near Coventry, to install new innovative technology... Read More >
- New Connections: will reforms help utilities serve developers better? Reforms to the way that water companies charge for new connections are the most visible element of a drive from Ofwat to... Read More >
- Comment: What could retail competition do for customers? Domestic retail competition could provide an opportunity to look again at how we determine the price of water to the... Read More >
- Comment: Sludge all set for reform The opening of the bioresources market presents water companies with an opportunity to do things differently, but what... Read More >
- Interview: Ben Jeffs, Chief Executive, MOSL “The whole industry has really mobilised around market opening, and the water companies deserve credit for that.” Read More >
- Close-Up: Who will be the big fish in the new water retail market? With a £2.5BN new market for non-domestic water retail to open in England in April, joint ventures, incumbents and new... Read More >