Guidelines for Consuming Late Season Produce Exposed to Floodwater

Heavy rains and the flowing water that results can
contaminate plants growing in the garden and
create a food safety hazard. As floodwater moves
into your garden, it can carry raw sewage
overflow, farm and domestic animal waste, river or pond water, and agricultural run-off, all of
which can be sources of human pathogens such as norovirus,
Salmonella, and pathogenic E. coli.
Gardeners and other people who mishandle and/or consume fresh produce exposed to floodwater
are at risk of gastrointestinal illnesses, with accompanying symptoms such as vomiting, stomach
cramps and diarrhea.
The flooding and heavy rains late in the 2018 growing season (August 2018) present a problem
for the home gardener. Many crops are at, or approaching, peak ripeness and it’s not feasible to let
produce mature for another 2-3 months while pathogens die through natural exposure to sunlight
and the environment. The question then becomes: how do I salvage as much garden produce as
possible from a garden exposed to late-season flooding?
If rain, and only rain, fell on the garden, you can continue to enjoy the bounty of the season.
However, if your garden was reached by flood waters from a nearby stream or lake, or if flowing
water carried animal waste or possible contaminants from nearby fields or compost piles, garden
produce may be risky to consume.
Discard produce that has come into direct contact with floodwater
What to do if flood waters entered your garden? The most conservative approach is to destroy
any produce that comes into direct contact with floodwater. And whether exposed directly or
indirectly to floodwater, any produce that is meant to be eaten raw
should not be consumed. This
means that crops such as lettuce and other leafy greens should discarded. While some thickskinned crops may be able to be salvaged (see below), any soft fruits such as raspberries or
blackberries which are impossible to clean should also be discarded and soft-skinned crops such
as tomatoes, peppers, and eggplants should be destroyed. Cantaloupe and other netted melons
present a higher risk to human health and the safest action is to discard these crops as well.
Clean and cook salvaged produce
There are fruits and vegetables that may be salvaged if they can be cleaned and are cooked before
eating. Wait at least 72 hours after standing water recedes before harvesting. Then thoroughly
clean and cook produce before eating.
Root crops, including carrots, parsnips, beets or potatoes should be cleaned to remove dirt and
contaminants by rinsing in clean potable (safe for drinking) water, followed by rinsing in a dilute
bleach solution, and then given a final rinse in clean water. Soap should not be used for rinsing
produce, just plain, clean water. These crops should be peeled and cooked before consuming.

Prepare the dilute bleach solution by mixing a scant tablespoon of regular, unscented bleach (not
concentrated and without fragrances) to one gallon of potable water. Dip water-washed produce
in the dilute bleach solution for 2 minutes prior to the final water-rinse.
Winter squash, winter melons, and pumpkins with their thick rinds can be washed and rinsed in
potable water, then sanitized in the dilute bleach solution described for root crops and rinsed.
Allow to air dry prior to peeling and cooking.
The change in the weather and cooler temperatures makes it impossible to recommend
consuming any produce items raw
where there is any risk of exposure to flood waters, even from
splashing. So, plan to cook any produce that you will harvest from flooded gardens for the
remainder of the season.
Any produce that is not fit for eating should not be preserved by canning, freezing or drying.
Salvaged produce should not be offered for sale at farmers’ markets or roadside stands. And for
food-safety sake, do not donate salvaged produce to food banks or food pantries.
Prevent contamination as you prepare salvaged produce
Good habits in the kitchen will help ensure that you are not spreading contamination as you prepare
salvaged produce. Wash your hands after handling produce exposed to floodwater; use soap and
water and scrub for at least 30 seconds. Dry hands with a disposable paper towel. Be sure to clean
counter tops, cutting boards and utensils that have been used to prepare salvaged produce for
cooking, or eating after cooking.
In order to prevent the spread of contaminants within the garden, remove soil, plant debris, and
sap from garden tools and harvesting containers used to handle produce from flooded fields. Rinse
tools and containers with clean water and then sanitize with a disinfectant such as Lysol, or a dilute
bleach solution. Allow to air dry.
28 August 2018
B. Ingham. bhingham@wisc.edu

Sharing is Caring - Click Below to Share