water quality and customer contacts for 2014. water quality events 2010 -2014 and category 3 and...
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Water Quality and Customer Contacts for 2014
Water quality events 2010 -2014 and category 3 and above events
2010 2011 2012 2013 20140
10
20
30
40
50
60
Process Network Other
Year
Nu
mb
er
Network water quality events
Third party damage Planned works Signal failure Mains burst Increased demand 0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Discoloured water event reasons
Network improvement programmes
• Improvements to network risk assessment process.
• Including review of information to be included for dynamic risk assessments (all works).
• Planned work RA is now split into 2 sections: Initial planning phase and return to normal operation.
• Increased use of hydraulic modelling.
• Improved utilization of online turbidity instruments, pressure monitors and loggers.
• Guidance briefed out via classroom based training.
Overall water quality performance (MZC)
2010 2011 2012 2013 201499.94%
99.95%
99.96%
99.97%
99.98%
Company vs industry average figures* Mean Zonal Compliance (MZC)
MZC Industry average
Year
Pe
rce
nta
ge
co
mp
lian
ce
*Data obtained from DWI Chief Inspectors Report
Improvements for taste and odour compliance
Earth / musty – raw water algae. • Algal management plans – source to tap.• Risk based sampling for geosmin and 2MIB
on raw and final.• Onsite taste and odour procedure. • Purchase of temporary PAC rigs.
» Pencil shavings – black alkathene.• Investigate material of service pipe.• Replace Company’s side. • Advise customer to replace their
side if present. • Resample.
Disinfection Control Index
2010 2011 2012 2013 20140
2
4
6
8
10
12
14 WTW coliform bacteria infringements
Year
Num
ber
Measures taken to improve our coliform bacteria compliance at WTW • Sample tap replacement programme.• Sample line replacement programme is on-going. • Optimum flushing time for sample lines. • Increased site audits.• Review of effectiveness of disinfection processes. • Training and awareness for site personnel
Customer contacts
2010 2011 2012 2013 20140
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
Discoloured water contacts - brown/black/orange Total no of Illness contacts Total no of taste and odour contactsTotal no of contacts
Year
To
tal
nu
mb
er o
f c
ust
om
er c
on
tact
s
Any questions?