Treatment For Coliform Bacteria In Well Water

So, you just got your well water test results back, and there it is—the dreaded word: coliform. Not to be dramatic, but it sounds like something that should be wearing a tiny lab coat and plotting a sequel to The Blob. Don’t panic. It’s not a death sentence; it’s just a very polite way of saying your water has invited some gross microscopic party guests over for a swim.

What Even Is Coliform?

Coliform bacteria are basically the janitors of the bacterial world—they hang out in soil, decaying plants, and animal intestines. They’re not usually dangerous themselves, but if they show up in your water, they’re like a flashing neon sign that says, “Hey, something nastier might have crash-landed here.” Think of them as the messy roommate who leaves the front door open—the actual problem is the raccoon that wanders in.

The surprise fact? A single drop of well water can host millions of these little guys. That’s like having a bacteria mosh pit in your drinking glass. But hey, at least they’re not charging for tickets.

Step One: Don’t Drink It Like It’s Fine Wine

First things first—don’t drink the water. I know, shocking advice. You don’t need to bathe in hand sanitizer, but boiling water for 1 minute will kill coliform dead as a doornail. Also, don’t brush your teeth with it. That’s just giving the bacteria a free tooth massage. Better yet, buy a few jugs of store-bought water while you sort this out. Your tap is on a time-out.

Shock Chlorination: The Nuclear Option

The most common treatment is shock chlorination, which sounds like a punk band but is actually just dumping a massive dose of bleach down your well. It’s like giving your water a hot, chemical bath—imagine your well screaming, “I’VE BEEN BLEACHED!” You pour in enough chlorine to smell like a swimming pool, let it sit for 12 to 24 hours, then flush it all out. It’s violent. It’s dramatic. And it works—unless your well is cracked or your septic tank is leaking, in which case you’re just bleaching the local earthworm parade.

Pro tip: Don’t do this when you’re wearing white clothes. I learned that lesson the hard way, and now my favorite shirt looks like a distressed art piece called “Regret.” Also, run your hoses until you can’t smell chlorine anymore—otherwise, your first post-treatment shower will feel like you’re bathing in a hospital.

Continuous Disinfection: The Overachiever’s Path

If chlorine shocks give you anxiety (or if the bacteria keep coming back like an ex with boundary issues), you can install a continuous disinfection system. This is basically a little machine that drips chlorine or pumps UV light into your water 24/7. A UV system is like zapping the bacteria with a tiny ray gun—it scrambles their DNA so they can’t reproduce. No babies, no bacteria. It’s Terminator for microbes, and it won’t make your water taste like a swimming pool.

But here’s the catch: UV doesn’t work if the water is cloudy. You need a sediment filter first, because bacteria love to hide behind dirt like a kid behind a couch cushion. Also, UV bulbs need replacing every year. Set a reminder, or you’ll end up with bacteria that have learned to do the hula under the light.

How To Filter Coliform Bacteria In Well Water - Woodham Camery

Don’t Forget the Source

Treating coliform is like putting a Band-Aid on a leaking pipe—it’s only half the battle. You have to figure out why they got in. Was the well cap cracked? Did a slug crawl down your vent pipe? Is your septic tank too close? That last one is the bacterial equivalent of your neighbor’s backyard barbecue smoke wafting into your bedroom. Move your septic tank at least 50 feet from the well, or you’re basically living in a petri dish.

And here’s a fact that will make you laugh and cry: 20% of private wells in the U.S. have coliform bacteria. That’s one in five. So if you have it, you’re not alone—you’re part of a grossly exclusive club. The membership card smells faintly of chlorine.

Are There Really “Good” Bacteria?

Look, coliform itself isn’t evil—it’s just a messenger. But if you test positive for E. coli, that’s a different story. That means poop got in your water. Yes, poop. And not cute puppy poop—like, from a mammal that shouldn’t be anywhere near your kitchen sink. At that point, stop reading this article and call a licensed well contractor. We’re not messing around.

The Takeaway: You Got This

Treating coliform bacteria in well water is entirely doable—it just needs a bit of science, some bleach, and maybe a sense of humor. You’ll shock the well, flush it, filter it, and if you’re feeling fancy, install a UV star destroyer. Within a few days, your water will be clear, safe, and taste like… well, water. Just remember: test your water every year or at least after a heavy rain—because bacteria are like freeloaders; they show up when the party gets wet.

Now go forth, brave well owner. Boil your water, shock your well, and maybe don’t invite coliform to the next barbecue. They never bring a good dip anyway.