Water Quality



Lake Sampling Results About Zebra Mussels
Test Your Own Shoreline How To Collect Water Samples






At the Feb 19 LOWA Public Meeting, Greg Stoner presented an update on the presence of zebra mussels in the Lake of the Ozarks. Their presence has been confirmed up to about the eight mile mark of the main channel. It is critical that all boaters and fishermen be aware of this threat to the entire lake and take precautions to prevent the spread to upper regions.

For further information on zebra mussels and for recommendations on how to prevent their spread, go here.

Testing for Quality


*Photo supplied by: S. A. Magnuson, USCGAux Nat'l Photo Corp

Test Your Own Shoreline



The following information is provided by McDuffey Lab:
McDuffey Lab is a state certified drinking water lab, certified by the Department of Natural Resources. All testing is performed in accordance with EPA standards.
We provide test kits for drinking water, lake water, run-off / ground water, and wastewater.
In drinking water we test for Coliform Bacteria (an indicator bacteria which is found in nature, but is not suppose to be found in drinking water). If Coliform Bacteria is present, it states that other harmful bacteria may be present as well, which we then test for E. Coli. The cost of this test is $25 for a 24 hour test or $27 for an 18 hour test.
Other tests that may be done are the Hardness test (stating how hard your drinking water is) for $10, and the Iron test for $7.50 Run-off or ground water: we test for fecal coliform. This may help determine if there is a wastewater leak. This test is $20

Lake water we test for E. Coli. The price is $25. For LOWA members it is $23. A Fecal Coliform can be done a s well as the E. Coli. for $20.

The test kits are available from McDuffey Lab on Monday through Thursday from 8am - 12pm and 1pm - 5pm. On Friday, 8am - 12pm, 1pm - 3pm.
We accept testing for drinking water Monday through Thursday from 8am - 12pm, 1pm - 5pm. No samples accepted on Friday. All wastewater, lake water, and run-off, or ground water is accepted Monday through Thursday Before 2pm. No samples after 2pm or on Friday. Payment for all sample need to be paid in full when samples are dropped off.

Any questions, please feel free to call. (573) 346-2092.
Jennifer Conaway
McDuffey Lab

How To Collect Lake Water Samples For E-Coli Testing

Collection of most environmental samples (water, air, soil) is based on scientific principles. The data obtained from analyzing environmental samples is only as good as the procedures and techniques used to collect them. The basics of collecting a surface water sample for analysis of Escherichia coli (E. coli) are presented here.

Sample Container

First and foremost, the container used for collection of any water sample for any bacterial analysis must be sterilized. It is best to obtain a certified pre-sterilized container from the laboratory that will conduct the analysis. In most cases, the container will be some form of plastic and have some type of seal on the cap to assure its integrity. Most bacterial methods require a minimum of 100 milliliters of water, and most containers manufactured for these samples will have a minimum fill mark indicated.

Sampling Location

The location to collect a sample is ultimately the decision of the sample collector. To avoid undue bias to the sample, however, the sample location should be one that will prevent introduction of debris such sticks, leaves, algae, insects, oil, gasoline, etc. into the sample. Avoid locations where large amounts of floating debris are noticed. Avoid locations very near any pipes or outlets that may be discharging at the time. Water depth should be sufficient to avoid disturbing bottom sediments that may interfere with the sample analysis. For this reason, wading into the water to collect the sample is discouraged. When collecting samples from a dock or boat, try to avoid disturbing algae clinging to the sides that might enter your sample container.

Sample Timing

The methods for E. coli analysis in water have a holding time of six hours. This means that in order to remain viable, a water sample must begin the analytical process at a laboratory within six hours of being collected. Beyond the six-hour period, too many of the organisms may die in the sample container to make analysis meaningful. Also, samples must be kept cool (less than 10° C or 50° F), but not frozen, immediately after collection to the time analysis begins. The entire analytical process for E. coli takes a little more than twenty-four hours, so be sure to check with your laboratory to assure what days of the week are appropriate. Most labs do not operate on weekends and holidays unless special arrangements are made in advance.

Sample Collection Procedure

When collecting the sample, cleanliness is most important. Assure that your hands are clean by washing with soap and potable water prior to sample collection. Commercially available hand sanitizers containing alcohol may be used – be certain to not introduce any of the alcohol into the sample. In waters that you feel unsafe about coming in contact with, wear appropriate protective gloves. Gloves will also protect the integrity of the sample. No matter how clean your hands or gloves may be, do not touch the inside of the sample container or cap.
To collect the sample, hold the container in one hand and remove the cap with the opposite hand. Invert the container (mouth down) and plunge into the chosen location to a suitable depth. Once submerged, upright the container, allow it to fill, and bring to the surface. Immediately replace the cap and place in an insulated cooler with ice. Collecting the sample at least six inches below the surface will help to avoid floating debris. Be sure to mark the container appropriately so that it may be identified not only by you but also by laboratory personnel. Include the date, time, and location of the collection and who collected it. Complete any required paperwork and transport to the laboratory without delay.  

 

 

 

(<<<Back)