Water main construction, renewal and repair are routine water utility activities. Main breaks are
common, especially for utilities in climates with alternating freeze-thaw cycles occurring from fall
to spring. Main breaks have been known to cause a range of water quality and quantity issues,
including intrusion of external chemical and biological contaminants during the failure event, as
well as during construction, repair and re-commissioning processes. The water utility typically
receives all customer complaints associated with the failure event, which can include loss of
pressure, excess turbidity, color, taste and odor, or total interruption of water service. The local
health authority may, or may not, receive water utility notification of the failure event or
consequences. Potential public health consequences from the exposure event often remain
unresolved. One dilemma for water utilities and public health professionals is the level and type of
notification and actions needed to best maintain municipal water infrastructure, while ensuring
protection of the public's health from all consequences of the failure event.
An infrastructure failure event can result in an elevated exposure potential for the affected local
neighborhood to transient contaminants introduced by the failure, as well as through loss of system
pressure. This exposure may result in clinical, or sub-clinical, manifestations of waterborne illness
in some, or all, of a locally exposed population if timely and adequate precautions are not taken.
Without public health notification, localized outbreaks may remain undetected but still inflict a
burden on the public health care system for treatment of waterborne disease even when the
etiologic agent and possible route(s) of exposure remain a mystery. There may also be public
health regulatory issues regarding consequences of water quality issues, or water supply
disruptions/shortages for affected users, as users may include private and institutional utility
customers normally supplied by the failed mains.
Capital Health Regional Health Authority, in Edmonton, Alberta, Canada, together with the
Regional Water Customer Group of utilities, comprised of 45 independent small to medium sized
water utilities, and EPCOR are actively working towards developing and implementing joint
agency criteria and protocols for notification of significant water infrastructure failures or
incidents, especially in known sensitive areas of the community such as hospitals, schools, longterm
care facilities, and others. This includes development of a collaborative framework for joint
policy and decision making to determine the most appropriate level of assessment and response to
the failure event, including joint agency response if required. Includes 21 references.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 320 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 06/01/2007 |
