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Water conductivity monitoring

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Conductivity is a measure of a solution's ability to conduct electricity, as measured in Siemens per meter (S/m). (lead image by @ddileona)

This page is under development, please add background info:

  • Info about regulations
  • Info about ecological or human health impacts
  • Advocacy leverage points
  • Constraints we're working within: cost, complexity, sensitivity, time

Also see resources on this page:



Here's a list of different conductivity sensors and measurement systems. Also see below for some Do-It-Yourself approaches to measuring conductivity, and this page for more information.


Activities for people to test methods (these develop over time)

Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.

Existing work

Title Author Updated Likes Comments
Building the new Coqui @natevw almost 4 years ago 0
Pros/cons to cheap handheld water meters for pH, TDS, conductivity? @warren almost 4 years ago 3
Water sampling workshop with a "Mega-Coqui" kit with One Cranston @warren almost 4 years ago 1
Build a sound-generating Coqui conductivity sensor (new version!) @warren over 4 years ago 5
Could we just use the PWM feature of an Arduino to generate the 50% duty cycle we need for the Coqui or for a water conductivity meter? @roberts_ecofarm almost 5 years ago 1
Inexpensive conductivity probe Step 1 - Sensor Probe design (revised) @roberts_ecofarm almost 5 years ago 2
Inexpensive conductivity probe for drinking water monitoring network @roberts_ecofarm almost 5 years ago 4
Voltage generation for conductivity sensor @roberts_ecofarm almost 5 years ago 2
DIY conductivity Sensors @roberts_ecofarm almost 5 years ago 6
DIY Science Lesson with the Coqui @pdhixenbaugh about 5 years ago 25
What probes to get with data loggers? @pdhixenbaugh about 5 years ago 4
Adding a jack to the Coqui @imvec over 5 years ago 1
Modified TDS sensor as Conductivity Sensor? @MadTinker over 5 years ago 9
Road Salt and Salmon @acjames76 over 5 years ago 0
Substitution for conductivity meter @Ag8n over 5 years ago 7
conductivity sensor electrolysis a concern in moving water? @MadTinker over 5 years ago 3
7 Ways to Measure, Monitor, and Evaluate Water Quality @anngneal over 4 years ago 2
In addition to testing for pH, what other water quality testing have you utilized, such as turbidity, conductivity, dissolved oxygen (DO), etc.? Can you share your experience with these? @gilbert almost 6 years ago 0
Anyone with experience using 316L welding rods for conductivity sensor probes? @MadTinker about 6 years ago 0
AstroPlant RPi sensory system @Sidney_AstroPlant about 6 years ago 10
Build a Coquí: A Simple Water Conductivity Sensor (version 1) @akshaya over 4 years ago 18
Riffle Device: Water Conductivity Sensor @rebeccah about 7 years ago 7
Mapping Lead-Free Water @smmontgom about 7 years ago 0