EC-GPS Water Logger

Water security for Indigenous communities is an urgent issue. Approximately one third of Indigenous communities in Canada are currently grappling with safe drinking water access, compromised environmental water quality, and associated health issues. Surface water monitoring is often limited in rural and remote regions. This is in part due to the difficulty of accessing remote sites. Even when monitoring is conducted it is usually expensive and intermittent , with results that can be difficult for communities to interpret. There is a need for low-cost, appropriate technology that enables communities to conduct fresh water monitoring.

Our Innovation

This manual describes how to build a cheap, portable, robust surface water monitoring device. The device is called a “data logger.” It uses open-source technology: anyone can use this Manual to build the device. The logger has a simple design, and can be easily built and repaired with mail-order parts, hence well adapted for use by rural and remote communities. The device can be easily transported by users who are traveling on land or water, or installed at a stationary point.  The approximate assembly time is 3–5 hours. The approximate cost is $600, substantially cheaper than commercially available data loggers.

What does the data logger test?

The logger records electrical conductivity (which is a proxy indicator for contamination) and GPS location. This allows users to collect water data at a precise location, and later return for additional water testing if necessary.  This device is not intended as a substitute for lab tests or more sophisticated water monitoring. Rather, the device is designed to enable users to identify specific areas that require more detailed testing.


The idea for this logger originated at a Water Bush Camp organized by Caleb Behn (then-Executive Director of Keepers of the Water), in the traditional territory of Halfway River, Saulteau, and West Moberly First Nations at Carbon Lake in 2015. The logger is an adapation of a device built by Dr. Mark Johnson (UBC) to log and monitor water in remote and humid environments in the tropics1  While the data loggers previously developed by Dr. Johnson’s group were stationary, the vast reaches of the north inspired a mobile unit that might be towed by a boat and used to sweep for potential contamination.  Teddy Eyster, an MSc student working with Dr. Johnson, worked to adapt the monitor for mobile use and test the device in two locations in NWT and Manitoba. This manual was then written by a collective of authors associated with the Sustainable Water Governance and Indigenous Law Project, housed at UBC on the traditional, ancestral, and unceded territory of the Musqueam people.


The Manual was funded by the Sustainable Water Governance and Indigenous Law project, a partnership grant funded by the Social Sciences and Humanities Research Council of Canada (Principal Investigator Dr. Karen Bakker (UBC)). Co-funding was provided by Brinkman Forest, with matching funding from MITACS. More information at:

For a short video about the logger, please click below.

For complete step-by-step instructions to build the logger, see the full EC-GPS Water Logger Manual.

For a high-resolution, printable version, please contact

Arduino Sketch for EC-GPS Water Logger
Additional sketches for troubleshooting

Step-by-step instructional videos are below.