For new neighbors
A new-homeowner guide to the utility serving your address, the hardness you are now drinking and showering in, the PFAS context, and a first-90-days water checklist. Written for families arriving from soft-water states who notice something has changed.
What should a new Summerville homeowner know about water?
Your address is served by one of five utilities: Summerville CPW, Berkeley County Water and Sanitation, Dorchester County Water Authority, Charleston Water System, or Mount Pleasant Waterworks. Summerville-area hardness runs 5.5 to 7.2 grains per gallon (moderately hard); Charleston is softer at 3.4 gpg; Mount Pleasant is softest post-treatment. Summerville-area water has five PFAS compounds detected above EWG advisories. The $96M remediation project completes 2029-2031. In the interim, a whole-home conditioner plus a certified RO at the kitchen tap is the standard residential setup.
Source: Summerville CPW CCR, EWG Tap Water Database, EPA 2024 PFAS rule
Utility territory
Your closing packet and your first utility bill name the utility. Here is a quick reference for the five utilities serving the Summerville / Charleston corridor.
First 90 days
Find the utility name on your closing packet or first bill. Download the most recent Consumer Confidence Report from their website. Read the first page.
For most new homes in Nexton, Cane Bay, Carnes Crossroads, and Foxbank the shutoff is in the garage. Older homes may have it near the front hose bib or inside a basement/crawlspace. Take a photo and tape it to the inside of an easy-to-find cabinet.
Utility averages are averages. Your kitchen sink is running whatever it is running today. A free 45-minute in-home test pulls a fresh sample and runs hardness, chlorine/chloramine, TDS, pH, iron, and aesthetic markers. You keep the printed results.
Use the cost calculator to compare 10-year bottled water spend, appliance protection, and the breakeven on a whole-home system. Bottled water alone is $12,000+ over 10 years for a family of four; the math is often closer to obvious than you expect.
Summerville CPW, Berkeley County, Dorchester County, and Santee Cooper all publish alerts. Sign up for at least one. The March 2026 advisory affected up to 200,000 residents; a 30-second subscription is worth the peace of mind.
A family of four spending $100 per month on bottled water spends $12,000 over 10 years on drinking water alone -- and still has hard water in the shower, dishwasher, and laundry. A $7,999 whole-home Puronics system pays back inside seven years on bottled water alone, with appliance protection savings pulling breakeven earlier.
Check your closing packet or your first month's utility bill -- the water utility is named on both. If you closed in Nexton, Cane Bay, or Carnes Crossroads, the short answer is Summerville CPW or Berkeley County Water and Sanitation depending on the section of the community. DCWA (Dorchester County Water Authority) serves Knightsville and purchases water wholesale from CPW, so the source water and general quality profile are equivalent. Summerville proper is CPW. If your address is peninsular Charleston, West Ashley, Johns Island, or Daniel Island, you are on Charleston Water System. Mount Pleasant is Mount Pleasant Waterworks.
The most common reason is a hardness switch. Metro New York City is roughly 1 grain per gallon (very soft). Coastal Florida and parts of the Jersey Shore are also soft. Summerville CPW delivers water at 5.5 to 7.2 grains per gallon (moderately hard). The calcium and magnesium in harder water leave a residue on skin and hair after showering that can feel filmy or tight. Dishes spot. Fixtures build scale. It is not that Charleston water is unsafe; it is that the mineral content is different from what your body and dishwasher were calibrated to.
Three things. First, find your Consumer Confidence Report from your utility (CPW, BCWS, DCWA, CWS, or MPW) and read it -- every utility publishes one annually. Second, book a free in-home water test to confirm what your specific tap is running, not just the utility average. Third, if hardness or PFAS is a concern, decide whether you want a whole-home conditioner, a point-of-use reverse osmosis unit at the kitchen sink, or both. The math is in the cost calculator.
Homes served by Summerville CPW or Berkeley County Water and Sanitation share Lake Moultrie source water, which carries approximately 7 ppt combined PFAS -- above the EPA 2024 rule's 4 ppt MCL for PFOA/PFOS. EWG testing of Summerville CPW data detected five PFAS compounds above health advisories, with PFUnA at approximately 1,183 times the EWG advisory. The $96M regional PFAS remediation project is funding a 2029-2031 treatment upgrade. For interim in-home reduction, certified reverse osmosis at the kitchen tap is the widely-deployed residential solution.
Bottled water addresses drinking. It does not address showering, hair, laundry, dishes, or scale buildup on your water heater and appliances. If your previous home had soft water and you noticed the difference immediately in the shower, bottled water for cooking won't bring that feel back. A whole-home conditioner addresses the feel, the scale, and the appliance protection side. A point-of-use RO at the kitchen tap addresses PFAS and drinking water. Most Lowcountry transplants end up with both; the math is in the cost calculator.
Pristine publishes $7,999 installed for a whole-home Puronics conditioning system, or approximately $95 per month with approved financing. Most new homes in Nexton, Cane Bay, Carnes Crossroads, and Foxbank have main water shutoffs in the garage, which keeps the install clean and fast -- typically about four hours by a SC-licensed partner plumber. Charleston-market Culligan and Kinetico quotes run $9,800 to $14,200 installed, priced only after a 60-90 minute in-home sales visit.
Pristine Water Networks is the authorized Puronics dealer for these communities. Owner Jarred Guidelli personally runs every free water test and participates in every install. The free 45-minute in-home test is available throughout Summerville, Nexton, Cane Bay, Carnes Crossroads, Foxbank, Mount Pleasant, West Ashley, Daniel Island, and the greater Lowcountry. Book at /book.
A Consumer Confidence Report (CCR) is the annual water quality report every community water system in the U.S. is required by the EPA to publish. It lists every regulated contaminant tested, the detected level, the MCL (legal limit), and source water information. Summerville CPW publishes its CCR at summervillecpw.com/waterqualityreport. Charleston Water System publishes at charlestonwater.com. Berkeley County Water and Sanitation and Mount Pleasant Waterworks each maintain their own annual reports. Reading yours is the best starting point.
A 45-minute in-home test on your kitchen counter. Your utility average is the utility average; your kitchen sink is your kitchen sink. Free, no purchase obligation, printed results either way.
