Is my water safe?
By Pat Burt – Wild West District Agriculture & Natural Resources Agent
Water is one of the four things that all of us need in order to survive. If you have forgotten the other 3 from learning them in school, they are air, food, and shelter. While we need water to survive, if water is not safe to drink it can make us sick or even kill us. So, knowing that your water is safe is important.
If you are on a public water system, there are both state and federal rules and regulations that your system must follow and should be doing the testing already to make sure your water is safe and of good quality for human consumption. If something is unsafe in the public water supply, your water system team should be taking necessary means to correct the problem and notify the public if necessary. The public water system has a yearly Consumer Confidence Report that is available to the public if requested for the previous year.
For those that are on private wells, you do not have the same rules and regulations as a public water system. There are regulations for well construction but as far as routine sampling, that is something left up to the owner or user of the well. Should a private well user sample their well? It certainly is a good idea and the Center for Disease Control recommends that you test private wells at least once a year for total coliform bacteria, nitrates, total dissolved solids, and pH levels. If you suspect other contaminants, you should test for those as well.
Coliform bacteria are not usually harmful to humans and are naturally occurring in the environment, although some, such as E.coli can cause mild to serious illness if present. Coliform bacteria can be found in soil, human and animal waste, surface water, and plants. They are tested for because they may indicate the presence of other potentially harmful bacteria.
Some faucets are better than others to use for sampling. If at all possible, you want to avoid these sampling sites:
- Outdoor faucets
- Faucets connected to water softeners, pressure tanks or other treatment
- Faucets that have swing spouts
- Faucets that are too close to the ground or the bottom of the sink
Sometimes, you do not have the “perfect” sampling point. In these scenarios you need to go with the best option and try to try to make things the best scenario that you can. For example, if you are taking an outside sample, do it when you do not have wind, rain, etc. that could contaminate your water sample.
How to take a drinking water sample:
Read the instructions from the lab you will be using. Make sure that you will have plenty of time between when you take the sample and when the lab will receive it (holding time) to make sure that the sample will reach them before the holding time for the analyte expires. For a coliform bacteria sample, there is only a 30 hour holding time. Some labs will allow up to 48 hours if the test is a non-regulatory sample. Also, some labs will not except samples arriving on Fridays and weekends or may charge more for them.
Here is an example from Servi-Tech on procedures for taking water samples for household suitability testing:
POLICY STATEMENT FOR BACTERIA TESTING
In order for coliform bacteria results to comply with State Health Department guidelines:
Samples must be analyzed within 30 hours of collection for regulatory
samples. Samples from private sources can be analyzed up to 48 hours of
collection, but will be flagged to indicate that the samples were analyzed past the regulatory holding time. The shorter time elapsed between collection and analysis of the sample, the more reliable the results. Samples needed for regulatory compliance must be shipped chilled. (The reliability of the results will be improved if shipped with blue ice in an insulated container.) Only samples collected in pressure-sterilized containers with Sodium Thiosulfate preservative (either in powder or pellet form) supplied by Servi-Tech Laboratories will be analyzed for coliform bacteria. There is no charge for containers supplied by the lab.
COLLECTING SAMPLES FOR DRINKING WATER ANALYSES
How to Take a Drinking Water Sample
1. For all analyses, wash hands with soap and water before collecting sample. Let cold tap run at full force for at least 3 to 5 minutes to clear the line.
2. For bacteria analysis:
a. Avoid collecting samples from outside sill-cock, frost-free hydrants, taps with aerators or charcoal filter attachments, or hot water faucets.
b. Disinfect the faucet by applying heat or dipping in a bleach solution (1-part water to 1-part bleach). Do not use heat on plastic or soldered screens. Let the tap run for 3 to 5 minutes to flush any residual chlorine from the line.
c. Completely remove the seal from the container with this orange “STERILE” label and carefully open the lid. Do not touch the inside of the container or the lid. Do not lay the lid down.
d. Slow the flow of water to a stream free of bubbles and take the sample without turning the faucet on and off.
e. Slowly fill the container with water to the fill line or no higher than the shoulder of the bottle. Do not rinse the powder or pellet (whichever is present) out of the container. Do not splash or allow the container to overflow. Replace the lid.
3. Fill the non-sterile container(s) if testing for other parameters.
4. Tighten the lids securely on all bottles to prevent them from opening during shipment.
5. Place the containers in the shipping box.
- Complete the information on the information sheet. Place the information sheet in the shipping box. Close, seal, and send the box promptly.
7. Collect and send bacteria samples early in the week. The required holding time for bacteria on regulatory water samples is 30 hours. Bacteria analysis for all other samples must be started within 48 hours of collection. Bacteria samples received on Friday or after 3:00 pm on Thursday will have a weekend surcharge.
After the sample(s) are analyzed, your report will indicate if your analytes are in the safe drinking water range. If the coliform bacteria sample comes back absent of the coliform drinking level, that is what you want. If it comes back positive, you may want to redo your sampling to make sure you did not somehow contaminate the sample. Should it come back with coliform bacteria being present again, you will need to look to see if you can identify anything that might have caused the problem. Did you have a repair on the line and did they disinfect your line upon completion? Do you have a hose that may have been left in a bucket of water and that water somehow go siphoned into your well? (You can eliminate the risk of this by having a device on your hose that prevents backflow of this sort). You will need to “shock” your well in order to disinfect the well. Here are directions on how to shock your well: https://bookstore.ksre.ksu.edu/download/shock-chlorination-for-private-water-systems_MF911 . Hopefully, after shocking your well, the coliform bacteria will no longer be present. You will also want to look at the other analytes to see what their levels are.
There are additional water tests that you can do if you are curious or have a concern about other analytes being in your water. Not all labs perform all tests, so if you want to do some of these other tests, you will need to find a lab that is certified to be able to do that testing.
Household water suitability kits for Servi-Tech can be picked up at any of the Wild West District Extension offices. Test kits are free and you can contact Servi-Tech for testing prices at 800-557-7509 or 620-227-7509. Servi-Tech does have weekly pickups in Hugoton at Skyland Grain and for Sublette and Liberal at the respective extension offices.