Real time distribution system water quality monitoring systems can play an
important role in complementing existing security measures to protect critical
infrastructures within the water distribution system. Information from on-line monitors,
when used in conjunction with data from epidemiological studies, syndromic surveillance
systems and multiple streams of operational data (including hydraulic models, acoustic
monitors and/or automated meter readers) can provide water utilities with an effective
system for developing early responses to unanticipated changes in drinking water quality.
Naturally there are logistical issues associated with developing such a comprehensive
distribution monitoring system. For example identification of appropriate parameters for
monitoring purposes, sensor maintenance and calibration frequencies, selection of ideal
monitoring stations within the distribution system, reliability of data communications to
the central monitoring location, effective mechanisms for data management and selection
of criteria that define water quality anomalies while minimizing the occurrence of false
positives. American Water has been tackling each of these challenges individually and,
although significant challenges remain, a picture is beginning to emerge of
an "ideal" infrastructure of a real time monitoring system that would help to enhance the
water utility operators ability to respond to water quality anomalies that may have a
public health impact to its consumers. An important criterion for the real time monitoring
system is that the architecture needs to be sufficiently flexible to accommodate new or
more sophisticated technologies as they emerge. Tailoring this design to meet system
specific needs followed by continuous real time monitoring of water quality parameters
and automated grab sampling for event verification using more sophisticated equipment
or analyses, will allow both operational optimization and improved responsiveness to
intentional and/or accidental contamination events that may be of public health concern. Includes 17 references, figures.