  Using a field-portable, smartphone fluorometer to assess water quality based
on the pH response of a designer probe, a map of pH of public tap water sites
has been obtained. A custom designed Android application digitally processed
and mapped the results utilizing the GPS service of the smartphone. The map
generated indicates no disruption in pH for all sites measured. All the data
are assessed to fall inside the upper limit of local government regulations and
are consistent with authority reported measurements. The work demonstrates a
new security concept: environmental forensics utilizing the advantage of
real-time analysis for the detection of potential water quality disruption at
any point in the city. The concept can be extended on national and global
scales to a wide variety of analytes.
