How To Treat A Well For Bacteria

So, you tested your well water and found bacteria. Ew, right? Don’t panic. It happens to the best of us—even if you keep your well cap sparkly clean.

Trust me, I’ve been there. You open that test result, see “Total Coliform Present,” and suddenly your morning tap water tastes like swamp tea. Here’s how to kick those little bugs to the curb.

First, the basics: What bit your well?

Bacteria usually sneak in from surface water, a cracked well cap, or a faulty seal. Think of it like a leaky roof—water brings uninvited guests.

You’ll need to shock the well. That’s not a technical term, but it is the main event. We’re talking household bleach, not the fancy industrial stuff. Plain, unscented bleach with 5-6% sodium hypochlorite.

How to shock your well (without losing your mind)

First, turn off the power to your well pump. Safety first, folks—you don’t want to electrify your science project. Then, remove the well cap and peek inside. If you see dirt or bugs, grab a broom later.

Now, pour the bleach. Use a one-gallon jug for every 100 feet of well depth. If you don’t know your depth, guess high—better to over-bleach than under-fight. Pour it slowly, and try not to gag on the chlorine cloud. (Pro tip: wear old shoes. Trust me.)

Next, hook up a garden hose to an outdoor spigot (not your kitchen sink—imagine drinking Clorox lemonade). Run the hose into the well casing, turn on the pump, and let the water recirculate for at least an hour. You’re basically making a bleach smoothie inside your own well.

Let it sit. Get a life for 12-24 hours.

Here’s the hard part: don’t touch the water. No drinking, no showering, no watering your prize petunias. Use bottled water or borrow a friend’s shower. Act like your tap is a dragon guarding a pool of poison.

Bacteria In Well Water

Why wait so long? The bacteria need contact time. Bleach doesn’t kill on contact in 3 seconds—it’s not a ninja. It’s more like a slow, swampy zombie that eats germs over hours. Give it its meal.

Flush, flush, flush (your entire soul)

After the waiting, hook up that garden hose again. Run it away from your house, lawn, and any creek or lake. Bleached water kills plants and fish like a chemical war crime. Send it to a gravel driveway or a patch of dirt you hate.

Run water through every faucet, toilet, and outdoor spigot until you stop smelling chlorine. That usually takes 15-30 minutes per tap. Your nose will get bored. Your arms will get tired. But keep going.

You might see brown or foamy water at first. That’s dead bacteria and mineral deposits. Gross, but good—it means the shock worked. Flush until it runs clear and you can’t smell the bleach anymore.

Now test again (don’t cheat)

Wait at least 7-10 days before retesting. Bacteria can bounce back faster than a bad horror sequel. If you test too soon, the shock might mask a lingering infection. Send a sample to a certified lab—home test kits can miss things.

Iron Bacteria In Well Water

If the test comes back clean, congrats! You’re a household hero. If bacteria reappear, you’ve got a recurring problem. That means you need to find the source: a cracked casing, a buried wire, or a well cap that’s basically a screen door for critters.

When to call a pro (and save your dignity)

Look, I love playing well plumber. But if you’ve shocked your well three times and the bacteria keep sneaking back, hire a licensed well contractor. They have tools like chlorinators, UV lights, and scopes to see inside the well. It’s worth the money.

Also, if you see E. coli on your test, stop fooling around. That’s a serious health risk. Call a pro immediately. Don’t drink the water, don’t take a shower, and don’t let your dog slurp from the hose.

Final pep talk (you’ve got this)

Treating a well for bacteria is like cleaning a giant water bottle that lives underground. It’s messy, it stinks, and it takes a day of your life. But once you taste that clean, chlorine-free water again—oh, it’s glorious.

You’ll feel like a wizard who banished a swamp goblin. And next time someone says “well shock,” you’ll nod knowingly and say, “Yeah, I’ve done that. No big deal.” It is a big deal, but you’re the hero your well needs.

Go forth and disinfect. Your tap water is waiting.