Bacteriological Testing

The City of Tecumseh laboratory is certified by the Michigan Department of Environment, Great Lakes and Energy (EGLE) to perform modified coliform bacteria testing.

There is an $18.00 fee for each sample that is analyzed, including resamples. Fee must be paid at City Hall before results can be released. Samples may be brought into the wastewater treatment plant Monday through Thursday from 7:00 am to 3:30 pm and Fridays from 7:00 am to 12:00 noon in order for the sample to set up prior to the weekend.  Sampling bottles may be picked up at either the wastewater treatment plant (710 E. Chicago Blvd.) or Tecumseh City Hall (309 E. Chicago Blvd.) Samples must be received within 30 hours of collection. Please bring it in promptly upon collecting sample or refrigerate the sample overnight. Once the sample is prepared, results are available after 24 hours.


  • Sample must be taken from a cold-water tap, and the line must be cleared by maintaining a steady water flow for at least two to five minutes or until the temperature stabilizes.

  • Always remove the aerator or screen from the faucet that you take the sample from.  Then, either flame the faucet with a lighter or torch (don’t try it if it’s PVC pipe) or place a small cup of bleach around the end of the faucet to get rid of any bacteria that may be on the outside of the faucet.

  • DO NOT take the water sample through a hose.

  • Please do not pour water from another container into the sample bottle, as the sample bottles are sterilized to maintain the integrity of the analysis.

  • Please do not rinse out the bottle.  The tablet inside is sodium thiosulfate, which is used to neutralize any excess chlorine in the sample.

  • We would prefer that the water not go through a water softener or in-line filter.
  • Carefully open the sterile bottle and fill it to the 100 ml line with water. Do not touch the mouth of the bottle or the inside of the cap.  Do not lay the cap down on anything.
  • If the sample is from a new well, please make sure the well was chlorinated correctly before testing the water.  Just putting the chlorinated water in the well and running it out is not enough.  The chlorinated water should sit in the well and the plumbing at least overnight, better if it can sit for 24 hours and then be run out.  There is no set amount of time to run the chlorinated water out; a good rule of thumb is to run it until you can’t smell the chlorine any longer.
  • Please fill out the water sample paperwork as completely as possible.