Water Runoff Toxicity from New Concrete

Jun 5, 2012
5
0
#1
Anyone know what the effects are to plants (grass & young trees/shrubs) with regard to water running off of new concrete?
The water appears amber/green and is very "slimy" to the touch which means the pH is on the base side (probably 2 - 3 if I guessed). It is highly irritating to the skin.

Have approx 1000 sq ft of concrete pool patio that collects in the middle and runs off to one end into my grass right near a new tree.
The earth worms hate it and make a mad dash away from the area.

Any info is helpful, thanks!
 

JohnT

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Apr 4, 2007
9,446
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SW Indiana
#2
Low pH is acidic, but you are correct that concrete is basic. 12 or 13 if my memory serves me. Any effect is going to be very temporary.