Is Summerville, SC Tap Water Safe to Drink?
Summerville tap water is legally compliant, but one contaminant exceeds health guidelines. Specifically: PFAS above EPA limits (PFOA: 5.7 ppt, PFOS: 6.7 ppt — limit is 4 ppt each). A point-of-use filter is recommended for drinking and cooking water.
Hardness Scale: Where Summerville Falls
0Slightly
60Moderate
120Hard
180Very Hard
250Extreme
400+
How Summerville Compares
Summerville's water is 71% softer than the national average of 138 PPM - ranking in the bottom 76% for hardness nationwide. Most homes here do not need a softener. Within South Carolina, it ranks #8 of 16 cities (5% above the state average of 38 PPM). Among cities (50k-100k), Summerville ranks #213 of 258 for hardness.
What Summerville's Water Means for Your Home
Hardness: 40 PPM - Low Concern
Summerville's water is slightly hard at 40 PPM. Most households won't notice any issues at this level. Scale buildup is minimal, and a water softener would be overkill. Summerville is softer than 76% of US cities. If you're thinking about water treatment, contaminant filtration is where to focus your money, not softening.
Contaminants & Safety
Forever chemicals (PFAS) are worth watching here. Summerville has PFOA at 5.7 ppt and PFOS at 6.7 ppt, exceeding the EPA's 2024 limit of 4 ppt per compound. PFAS are synthetic compounds that accumulate in your body over time. A certified carbon filter or reverse osmosis system with NSF P473 certification is the most effective protection. See the regulatory timeline.
What's in the Treatment Process
Summerville's surface water supply requires heavy chlorination to stay safe — but that creates a tradeoff. The treatment process generates disinfection byproducts: TTHMs at 25.2 ppb (32% of the legal limit, but 168x the EWG guideline) and HAA5 at 11.3 ppb (19% of the legal limit, but 113x the EWG guideline). These are within legal limits, but the EWG sets much tighter thresholds based on cancer-risk research. A whole-house activated carbon filter reduces both chlorine and byproducts.
Chromium-6 was detected at 0.0505 ppb, which is 2.5x the EWG health guideline. There's no separate federal limit for chromium-6, only total chromium. A reverse osmosis system is the most effective removal method. All measurements are within federal legal limits. The EWG guidelines represent a more conservative, health-based standard.
| Contaminant | Detected | Health Guideline | Legal Limit | Status |
|---|---|---|---|---|
| Hardness (as CaCO₃) | 40 PPM | < 60 PPM | No federal limit | ✓ OK |
| Total Dissolved Solids | 60 PPM | < 300 PPM | 500 PPM | ✓ OK |
| PFAS (total) | 33.05 ppt | — | No total limit | Detected |
| ↳ PFOA | 5.7 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| ↳ PFOS | 6.7 ppt | 0 ppt | 4 ppt (2024) | ⚠ Exceeds |
| Lead | 0.9 ppb | 0 ppb (no safe level) | 15 ppb (10 ppb in 2027) | ✓ Low |
| Chlorine / Chloramine | 0.8 mg/L | Taste threshold ~1.0 | 4.0 mg/L | ✓ Normal |
| Nitrate | 0.26 mg/L | 5 mg/L | 10 mg/L | ✓ OK |
Recommended Filter for Summerville
PFAS exceed EPA limits (PFOA: 5.7 ppt, PFOS: 6.7 ppt — limit: 4 ppt each). A certified filter reduces these contaminants effectively.
How to Test Your Water in Summerville
With PFAS at 33.05 ppt in Summerville's supply, confirming your home's specific levels is especially important. PFAS vary by neighborhood and can concentrate differently depending on your position in the distribution system.
Free option: Request Dorchester County Water's annual Consumer Confidence Report for official city-level data.
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About Summerville's Water Supply
Water Utility: Dorchester County Water
Water Source: Edisto River & local wells (Surface Water)
Population Served: 81,750
Hardness: 40 PPM (2.3 grains per gallon)
Summerville's drinking water comes from surface sources — Edisto River & local wells. Surface water requires more extensive treatment than groundwater, including coagulation, filtration, and disinfection. This heavier chlorination is why disinfection byproducts tend to be higher in surface-supplied systems. On the upside, surface sources often deliver softer water than deep aquifers. The system serves 82,000 residents.
Water quality can vary by neighborhood and season. For your exact numbers, request Dorchester County Water's Consumer Confidence Report (CCR) or test your own tap.
ZIP Codes Covered by This Report
This water quality data applies to all areas served by Dorchester County Water in Summerville, SC, including ZIP codes:
29018, 29041, 29047, 29048, 29059, 29081, 29082, 29133, 29142, 29148, 29163, 29426, 29432, 29433, 29435, 29436, 29437, 29446, 29447, 29448, 29452, 29456, 29471, 29472, 29474, 29475, 29477, 29481, 29483, 29484, 29485, 29486, 29488, 29493, 29929
If your ZIP code is listed above, this report covers your water supply. Water quality may vary slightly by neighborhood.
Compare Summerville to Other South Carolina Cities
Frequently Asked Questions About Summerville Water
Is Summerville tap water safe to drink?
Where does Summerville's water come from?
Do I need a water softener in Summerville?
How do I remove PFAS from Summerville tap water?
What water filter is best for Summerville?
Is Summerville water safe for babies and infants?
What are disinfection byproducts in Summerville's water?
Is chromium-6 in Summerville's water?
Data sources: Lead and copper data from EPA Safe Drinking Water Act LCR reporting. Contaminant data from utility-reported testing results. PFAS data from EPA UCMR5 (2023–2025). Hardness from USGS and municipal reports. Data reflects system-level testing results and may not match your specific tap due to neighborhood plumbing, season, or recent utility changes. For your utility's latest results, request their Consumer Confidence Report (CCR). Our methodology. Last updated: 2026-02-24.
What Summerville Homeowners Actually Buy
Prioritized for contaminant reduction for homes with 40 PPM water and PFAS above EPA limits.
Affiliate disclosure: we may earn a commission. Selection based on Summerville's water data.