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Verona, Wis.
 

GAP Water

GAP Water Samples in 3 Easy Steps!

1.  Pick up water bottle supplies - Until October, stop by the UW Hancock Agricultural Research Station or the WPVGA office in Antigo during business hours, Monday-Friday and get the supplies you need.

UW Hancock Ag Research Station, N3909 County Rd V, Hancock, WI 54943
Wisconsin Potato and Vegetable Growers Association, 700 5th Ave, Antigo, WI 54409

2.  Drop off samples - Starting in June, head back to Hancock or Antigo to drop-off your samples in the AgSource Laboratories labeled refrigerator.

  • Hancock-Mondays 12 noon-4:00 pm, or Tuesday mornings 8am
  • Antigo-Wednesdays 8:30 am-4:00 pm  

3.  Receive your water test results - Reports will be sent in 1-2 days via email or USPS.  

Be sure to collect water samples just before you head to drop off location because there is a maximum 30 hour sample life. Keep your samples cool.

Thank you to Hancock Ag Research Station and the WPVGA office for partnering as a local GAP water pick up/drop off site. 

Resources & Forms

GAP Water Sample Submission Form
GAP Water Sampling Guide
Online Supply Order Form
FDA Final Produce Rule
USDA GAP Program

Questions?
Call Jean Bernius (715)-240-0444 or AgSource Laboratories in Marshfield, Wis., (715)-898-1402 or marshfield@agsource.com.

Sampling Instructions for GAP Water Testing

Start with the appropriate container.  Containers for water sampling should hold at least 100ml. The interior should be sterile and the container should be sealed to prevent contamination.  When received from the lab, bottles contain a thiosulfate preservative.  Do not empty this out.  Be extra careful not to overfill the bottle, as this may cause the preservative to run out.

Keep the bottle sterile. Do not put your fingers inside the sterile bottle and do not put the sterile bottle lid on the ground.  Try to hold the lid while you collect your water sample.  If the bottle or lid is touched or contaminated, just ask the laboratory for another sterile bottle.

Irrigation Water from a Well

Collect the sample as close to the water source as possible. This means collecting the sample from the outlet that is closest to the well.

Prior to collecting, the rim of the outlet (valve, spigot, etc.) should be sanitized. This can be done using a flame or chlorine-containing wipe. Wiping the valve with an alcohol wipe is also acceptable. 

Let the system run. Water should be allowed to flow out of the outlet long enough to flush the system. A good rule of thumb is to run the system at least 3-5 minutes longer than is necessary to empty the volume of stagnant water remaining from the last use.

Fill the container at least 3/4 full and close the bottle as quickly as possible.

Surface water, such as ponds and lakes

Try to sample at a depth of 6-12 inches. If a dock or other structure is not available for access to deeper water, one can attach sample container to a pole.

Care should be taken not to sample too close to the bottom, as sediments may be collected with the sample. If you need to walk into the water, sampling should be done ahead of the muddy front that is stirred up by motion. Remember that excess rainfall can also stir up bottom sediments and alter test results. Samples should not be taken immediately after rainfall.

Best practice is to collect the sample during a time when the water would normally be used for irrigating. If irrigating from flowing surface water, such as a creek or stream, and it is necessary to wade into the water, be sure to sample from the upstream side, again to avoid collecting stirred up sediments.

Water used for Postharvest (similar to collection from an irrigation well)

Select an outlet close to where water lines come into the packing facility.

All attachments such as aerators or garden hoses should be removed.

The outside rim of the outlet should then be sanitized with alcohol or a bleach-containing wipe.

Water should run through the outlet for 3-5 minutes.

Fill the sample container, taking care to make sure that the container is open for as little time as possible.

Remember to label your samples!

Select an outlet close to where water lines come into the packing facility.

All attachments such as aerators or garden hoses should be removed.

The outside rim of the outlet should then be sanitized with alcohol or a bleach-containing wipe.

Water should run through the outlet for 3-5 minutes.

Fill the sample container, taking care to make sure that the container is open for as little time as possible.

 
 
   
 
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