Quick answers

One question, one straight answer, no scrolling past someone's life story. For the full walkthroughs, the guides go deeper.

• How much bleach does it take to shock a well?

  About 3 pints of plain 5.25% bleach per 100 gallons of well water lands near the 200 ppm target extension services publish.

• How long after shocking a well can you drink the water?

  Give the disinfectant its full contact time, usually 12 to 24 hours with no water use, then flush from an outside spigot until a residual test shows zero disinfectant left.

• Why does my well water smell bad after it rains?

  A smell that follows rain means surface water is reaching your well.

• How often should a water well be cleaned?

  Test yearly, and clean when the evidence says to: a positive bacteria test, slime or odor returning, staining getting worse, or fading water pressure.

• Can you shock a well with pool shock?

  Chemically it is the same calcium hypochlorite most well sanitizer packs contain, so it can work, with two big cautions: use only plain calcium hypochlorite labeled safe for potable water, never a pool blend with algaecides, clarifiers, or stabilizer (cyanuric acid), and dose by your well's actual gallons rather than by scoop..

• How long does it take to shock a well?

  Plan on a weekend of mostly waiting: an hour or two of actual work mixing, pouring, and recirculating, then 12 to 24 hours of contact time with the water off, then a few hours of flushing until the residual reads zero.

• Is well water safe to drink?

  Well water is safe when it tests safe, and nobody tests it but you: private wells are the owner's responsibility, not the EPA's.

• How deep is my well?

  The fastest answer is your well's drilling record: most states filed one when the well was drilled, listing total depth, casing diameter, and the static water level.

• Why is my well water brown all of a sudden?

  Sudden brown water is usually stirred-up iron and sediment: heavy pumping or a dropping water table pulling from the silty bottom, rain pushing surface water in, recent well or plumbing work shaking rust loose, or a slug of iron bacteria sloughing off the casing.

• Does shocking a well kill iron bacteria?

  A shock treatment can knock iron bacteria back, and the chemistry decides how far.

• How much does it cost to shock a well?

  Do-it-yourself with store bleach runs $10 to $50 in materials plus your own math and guesswork.

• What is shock chlorination?

  Shock chlorination is disinfecting a well by raising its chlorine level far above drinking-water levels, typically to 100 to 200 ppm, holding it for 12 to 24 hours, then flushing it out.

• Why does my well water stink?

  The smell names the suspect.

• How do you shock a well for iron bacteria?

  The same shock procedure as any well, with two adjustments for the slime: expect the colony's biofilm to consume disinfectant, so verify with a residual test rather than assuming the dose held, and favor a disinfectant that penetrates biofilm.

• How do you shock a well after a positive coliform test?

  Find the entry point first, then shock, then retest.

• How do you disinfect a well?

  Disinfecting a well means dosing its full water system with a disinfectant strong enough to kill the bacteria living there, holding it for the contact time, then flushing it out and proving the result with tests.

• Can you shock a well with hydrogen peroxide?

  Peroxide's home turf is continuous odor treatment, not a one-time shock: injection systems feed it constantly to oxidize sulfur smells.

• How do you flush a well after shocking it?

  Run an outside spigot onto ground that drains away from your septic system, your garden, and any pond or stream, until a residual test shows the disinfectant is gone.

• Can you shock a shallow well or sand point?

  Yes.

• How do I find my well's drilling record?

  Start with your state: most states required the driller to file a completion report listing total depth, casing diameter, and the static water level, and most keep those records searchable online.

• How do you chlorinate a well?

  Chlorinating a well is the traditional shock treatment: figure the gallons of standing water from the well's depth, static water level, and casing diameter, dose plain unscented bleach or potable-grade calcium hypochlorite to 100 to 200 ppm per extension guidance, pour it down the casing, recirculate with a hose, pull it to every tap, hold 12 to 24 hours, then flush outside until a residual test reads zero and retest for bacteria in one to two weeks..

• Does a water filter remove the sulfur smell from well water?

  Some do, and none of them fix the cause.

• Do I need a sediment filter for my well?

  You need one if grit, sand, or rust particles are reaching your fixtures: clogged aerators, a gritty water heater, or a layer that settles in a glass.

• Where can I get my well water tested?

  Start with your county health department, which often tests private wells for coliform and nitrate at low cost, then your state's list of certified drinking water laboratories, then the county extension office, which runs well testing clinics in many states.

• Is chlorine dioxide safe for treating well water?

  Chlorine dioxide is an EPA-registered drinking water disinfectant that municipal water plants run every day, and the EPA sets an allowed level for it in finished drinking water.

• Why is my well water yellow?

  Yellow or tea-colored well water is usually tannins, organic matter dissolved from decaying vegetation, common in shallow wells and near wetlands or peaty ground, or dissolved iron beginning to oxidize.

• How do you get sediment out of well water?

  Catch it with a sediment filter at the pressure tank, sized to the particles that are getting through, and find out why it is entering the well.

• Do I need a UV system for my well?

  A UV system disinfects water continuously at the point it enters the house, which is the right tool when a well keeps testing positive for bacteria despite a sound wellhead and a proper shock treatment, or when the source is a spring or shallow well that will always see surface influence.

• Can you put chlorine tablets in a well?

  Never pool tablets: trichlor tablets carry cyanuric acid, which does not belong in drinking water.