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Private water well owners should test well after a flood

Well owners in flooded areas should assume their well water is contaminated and have it tested. (Texas Well Owner Network photo)


Private water well owners whose wells flooded from the recent rains should assume that their well water is contaminated until tested, according to Dr. Diane Boellstorff, Texas A&M AgriLife Extension Service water resource specialist, College Station.
“You should not use water from a flooded well for drinking, cooking, making ice, brushing your teeth or even bathing until you are satisfied it is not contaminated,” Boellstorff said.
Boellstorff, who is in Texas A&M University’s soil and crop sciences department, said floodwater might contain substances from upstream, such as manure, sewage from flooded septic systems or wastewater treatment plants, or other contaminants. A septic system near a well also can cause contamination when the soil is flooded.
She said owners should send their water to a laboratory for testing. The Texas Commission on Environmental Quality provides a list of certified laboratories that analyze drinking water samples at  www.tceq.texas.gov/goto/certified_labs. The Texas Department of State Health Services website also lists local public health organizations that may offer well water testing at www.dshs.texas.gov/regions/lhds.shtm.
Drew Gholson, AgriLife Extension program specialist and Texas Well Owner Network coordinator, College Station, said those with private wells possibly contaminated by floodwater should use only bottled, boiled or treated water until water has been tested and found safe.
“To make water safe for drinking, cooking and washing, bring it to a rolling boil for at least one minute and then allow it to cool,” he said.
Gholson, also in the soil and crop sciences department, said if boiling isn’t possible, the water can be disinfected with regular, unscented household bleach.
“Add one-eighth teaspoon, about eight drops, per gallon of water, stir well and let stand for 30 minutes before using,” he explained.
Further details are described in a free AgriLife Extension publication: Disinfecting Water after a Disaster.
Boellstorff said the well may need to be decontaminated to make the water safe to drink again. Instructions for decontaminating a well, including Decontaminating Flooded Water Wells and Shock Chlorination of Wells, are available from AgriLife Extension’s Texas Well Owner Network website at twon.tamu.edu/fact-sheets.
“After a flood, well owners should inspect the well for physical damage and look for signs of leakage,” Gholson said. “If it appears damaged, consult a licensed water well contractor to determine whether repairs are needed.”
Gholson said well owners should also check the well pump and electrical systems.
“If the pump and/or electrical system have been underwater and are not designed to be used underwater, do not turn on the pump,” he said. “There is a potential for electrical shock or damage to the well or pump. Once the floodwaters have receded and the pump and electrical system have dried, a qualified electrician, well driller or pump installer should check the wiring system and other well components.”

September 6, 2017 / Disasters

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