We have rust colored deposits growing on painted white cement block basement walls..anyone know what this is?

it forms little tiny balls the size of be-be's and form miny clustersWe have rust colored deposits growing on painted white cement block basement walls..anyone know what this is?
It has to be seepage coming from your water system. I'm guessing it's on the inside of the the basement wall, not the outside.





Do you have a sprinkler system to water your lawn? Even treated city water can make rust stains on light-colored surfaces. If your lawn slopes toward your house instead of away from it, the water can seep into your basement through the blocks if they weren't properly backplastered. Easiest way to fix this would be to add some topsoil to your yard where it's low around the house so the water drains away from the house.





If you don't have sprinklers or low spots, is the problem near where your water enters your house? There may be a leaky water main out there. If that might be the case, call your city water department and have them check it out. They won't pay for cleaning up your basement, but they might be able to stop it from getting any worse.We have rust colored deposits growing on painted white cement block basement walls..anyone know what this is?
Could be mold from dampness. If you don't already have a dehumidifier I suggest you get one. Get one to handle the square footage.





Also check the hair line cracks in the wall. Another thing you can do, is make sure the water/rain is diverted away from the house foundation.


You can extend your rain cutters by using black hosing that goes around the down spouts.


They'll know what you need at any of the home improvement stores.





You're going to have to wash the wall down with bleach to get rid of the mold.
Metal ties are sometimes used to hold the blocks together or to the outside wall.These sound as if they are now wet and rusting do try to look at one area to identify if I am correct.I am not sur of the remedy and if this were the case the advice of a builder of structural engineer maybe a way foreword.