If you moved here in the last two years, your skin already told you something changed.
First week: "the water feels different." First month: "my hair feels like straw." By month three, you're rotating through three different shampoos trying to fix something that's not a shampoo problem.
It's the water. And it has a number.
The Number: 7.2 Grains Per Gallon
Summerville CPW, which serves Nexton, Cane Bay, Carnes Crossroads, Foxbank, and Summerville proper, delivers water at about 7.2 grains per gallon (gpg). That's moderately hard on the USGS scale.
If you moved from:
- New York City: about 1 gpg
- Coastal Florida: 1-3 gpg
- Most of California: variable, but many cities under 5 gpg
- Charleston Water System areas (peninsular Charleston, James Island, West Ashley): about 3.4 gpg
You jumped from soft or moderate to moderately hard. That jump is the whole story.
The Mechanism
Hardness is calcium and magnesium dissolved in the water. Here's what happens when those minerals meet your shampoo:
Soap and shampoo work by binding to oils and rinsing them away. In soft water, soap dissolves completely and rinses clean. In harder water, calcium and magnesium react with the soap molecules and form a sticky residue called soap scum.
That soap scum sits on your hair. As your hair dries, the residue tightens. Your hair feels stiff, coarse, crunchy. It looks dull. Conditioner helps temporarily because it coats over the residue, but the next wash starts the cycle over.
The same mechanism plays out on your skin. Soap residue sits on your skin's surface. For some people, this creates a tight, dry feeling, especially in the Lowcountry's summer humidity when you're showering twice a day.
What This Isn't
This post is about water chemistry, not medicine. I'm a water treatment installer, not a dermatologist.
Dry skin and hair changes can have many causes: seasonal changes, humidity patterns, diet, hormonal shifts, skin conditions, medication side effects. If you're dealing with a persistent skin issue, see your physician or dermatologist. Water hardness is worth mentioning to them as a variable, because it's a variable you can measure and change.
What I can do is give you the number. A free water test tells you exactly how hard your shower water is, in grains per gallon, measured on your counter.
What Transplants from Soft-Water Cities Notice
Here's the timeline we hear from Nexton and Cane Bay transplants:
Week 1: The water feels different. Soap doesn't lather the same. The shower has a slightly different "finish."
Month 1: Hair feels stiff or crunchy. Skin feels tighter after showering. Some people describe it as "waxy."
Month 3: You've tried new shampoo, new soap, new conditioner. The products help a little but the baseline is different from your last city. You start Googling.
Month 6: You've noticed the showerhead crust, the dishwasher spots, the laundry texture. You start wondering if it's the house, the city, or the water.
It's the water. The number is 7.2.
The Soap Connection
If you're spending $60 to $150 a month on EWG-rated soaps, shampoos, and cleaning products, here's the irony: those products are formulated for clean-rinse conditions. In 7.2 gpg water, they're not rinsing clean. You're paying for premium soap and getting premium soap scum.
A conditioned or softened water supply changes the baseline. Your existing products rinse the way they're supposed to. Most people actually use less product after the water changes because the soap is doing its full job.
What You'll Notice in Week 1 After a Conditioner
Here's what Lowcountry homeowners tell us after their first week on conditioned water:
- Hair is softer and feels lighter after drying
- Skin feels smoother coming out of the shower
- Soap lathers more and you use less of it
- Glasses come out of the dishwasher without the film
- The "squeaky clean" feeling comes back
These are aesthetic differences. They're what a hardness change feels like in practice. Individual experiences vary.
The Comparison Test
Here's an experiment you can run at home without calling anyone. Fill a clean glass jar halfway with your tap water. Add two drops of liquid dish soap. Close the lid and shake it for 10 seconds.
In soft water, the soap creates thick, lasting suds. In hard water, the suds are thin, sparse, and collapse quickly. You'll see a cloudy film instead of clean bubbles.
That's the same reaction happening on your hair and skin every time you shower. The soap can't do its job because the calcium and magnesium in the water are intercepting the surfactant molecules before they dissolve.
Run the same test with bottled spring water (which is typically very soft). You'll see the difference instantly.
The Cost of Compensating
Here's what the hardness actually costs a Summerville household, beyond the aesthetic complaints:
Extra soap and shampoo. You're using 30-50% more product to get the same lather you'd get in soft water. Over a year, that's $200-$400 in extra soap, shampoo, conditioner, and cleaning products for a typical household.
Bottled water. If you're buying bottled water because the tap doesn't taste right, that's another $50-$150 per month depending on your consumption.
Appliance life. Hard water scale shortens the life of water heaters, dishwashers, and washing machines. The Department of Energy estimates that scale reduces water heater efficiency by 22-30% at 7+ gpg.
Filter replacements. Fridge filters and pitcher filters need replacing more often in hard water because they clog faster with mineral deposits.
FAQ: Hair and Hardness
Why is my hair crunchy in Summerville?
Usually it's the hardness. CPW runs about 7.2 gpg. If you moved from a soft-water area, the harder water leaves soap and conditioner residue that stiffens as it dries.
Will a water softener fix it?
A conditioner or softener reduces the hardness at the source. Most people notice a difference in the shower within the first week. It's not a medical treatment. It's a water-chemistry change.
My dermatologist said it could be the water. What should I do?
A free water test gives you the actual hardness number for your tap. That's a useful data point for a conversation with your doctor. We'll test it and give you the number.
I'm still buying bottled water. Is the tap safe to drink?
CPW water meets all EPA limits. It's legally safe to drink. The taste issue is usually the chlorine disinfectant, which a carbon filter at the kitchen tap handles. Many transplants switch from bottled to filtered tap and save $50-$150 per month.
If You Want to See What's in YOUR Shower
Book a free in-home water test. 45 minutes. I'll test your tap, show you the hardness number, and explain what it means for your soap, your hair, and your showerhead. If your water's fine, I'll say so.
Call or text Jarred at (843) 302-5720, or book at prstnwtr.com/book.