What was found in Summerville's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 10000 µg/L 100% of the EPA limit 10000 µg/L Highest in the city: SANDY RUN MHP (SC0860037) · 41 people · 2019 | 1/9 | SYR4 |
| Fluoride | 2325 µg/L 58% of the EPA limit 4000 µg/L Highest in the city: DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2019 | 2/9 | SYR4 |
| Copper | 134.905 µg/L 10% of the EPA limit 1300 µg/L Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2017
Highest in the city: 250.5 µg/L — DCWS HIGHWAY 17A (SC1820009) · 200 people · 2018 | 4/9 | SYR4 |
| Nitrate-Nitrite | 76.75 µg/L 0.8% of the EPA limit 10000 µg/L Highest in the city: SANDY RUN MHP (SC0860037) · 41 people · 2019 | 1/9 | SYR4 |
| TTHM | 39.065 µg/L 49% of the EPA limit 80 µg/L Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019
Highest in the city: 45.4935 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2019 | 4/9 | SYR4 |
| Total Haloacetic Acids (HAA5) | 40.86 µg/L 68% of the EPA limit 60 µg/L Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019 | 4/9 | SYR4 |
| Dichloroacetic Acid | 26.7 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019 | 4/9 | SYR4 |
| Gross Alpha, Excl. Radon And U | 25.37 pCi/L 169% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Highest in the city: SANDY RUN MHP (SC0860037) · 41 people · 2019 | 1/9 | SYR4 |
| Bromoform | 9.9125 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019
Highest in the city: 23.418 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2019 | 2/9 | SYR4 |
| Chloroform | 18.81 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019
Highest in the city: 22.911 µg/L — DCWA CALOMET VALLEY (1850009) · 275 people · 2019 | 4/9 | SYR4 |
| Dibromochloromethane | 13.795 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019
Highest in the city: 16.448 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2019 | 4/9 | SYR4 |
| Bromodichloromethane | 12.885 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019
Highest in the city: 13.962 µg/L — DCWA CALOMET VALLEY (1850009) · 275 people · 2019 | 4/9 | SYR4 |
| Lithium | 12.7 µg/L No EPA limit set Highest in the city: DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2025 | 1/9 | UCMR-5 |
| Trichloroacetic Acid | 10.952 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019
Highest in the city: 11.506 µg/L — DCWA CALOMET VALLEY (1850009) · 275 people · 2019 | 4/9 | SYR4 |
| Monobromoacetic Acid | 7.622 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019
Highest in the city: 10.7635 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2019 | 4/9 | SYR4 |
| Dibromoacetic Acid | 5.5645 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2019
Highest in the city: 9.808 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2019 | 4/9 | SYR4 |
| Lead | 3.645 µg/L 24% of the EPA limit 15 µg/L Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2017
Highest in the city: 8.91 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2017 | 4/9 | SYR4 |
| Gross Beta Particle Activity | 6.095 pCi/L No EPA limit set Highest in the city: SANDY RUN MHP (SC0860037) · 41 people · 2019 | 1/9 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.4 µg/L 23% of the EPA limit 6 µg/L Highest in the city: DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2019 | 1/9 | SYR4 |
| Combined Radium (-226 And -228) | 1.2 pCi/L 24% of the EPA limit 5 pCi/L Highest in the city: SANDY RUN MHP (SC0860037) · 41 people · 2019 | 1/9 | SYR4 |
| PFOS | 0.0081 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2025 | 3/9 | UCMR-5 |
| Pfpea | 0.0066 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2025
Highest in the city: 0.0072 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2025 | 3/9 | UCMR-5 |
| Pfba | 0.0051 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2025
Highest in the city: 0.0070 µg/L — DCWA CALOMET VALLEY (1850009) · 275 people · 2023 | 3/9 | UCMR-5 |
| PFOA | 0.0062 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2025
Highest in the city: 0.0065 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2025 | 3/9 | UCMR-5 |
| Hfpo-Da | 0.0062 µg/L No EPA limit set Highest in the city: DCWA CALOMET VALLEY (1850009) · 275 people · 2023 | 1/9 | UCMR-5 |
| Pfhxa | 0.0059 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2025
Highest in the city: 0.0062 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2025 | 3/9 | UCMR-5 |
| PFBS | 0.0044 µg/L No EPA limit set Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2025
Highest in the city: 0.0046 µg/L — DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2025 | 3/9 | UCMR-5 |
| Pfhpa | 0.0030 µg/L No EPA limit set Highest in the city: DCWA KNIGHTSVILLE (SC1820001) · 40,141 people · 2025 | 1/9 | UCMR-5 |
| Lead | 0.00090 mg/L 6% of the EPA limit 0.0150 mg/L Main supplier: SUMMERVILLE CPW (SC1810003) · 81,750 people · 2023 | 9/9 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Summerville
| Supplier | Population served |
|---|---|
| SUMMERVILLE CPW (SC1810003) | 81,750 |
| DCWA KNIGHTSVILLE (SC1820001) | 40,141 |
| DCWS/CLAY FIELD DRIVE (SC1850014) | 1,648 |
| HOMECOMING SUBDIVISION (SC1850016) | 883 |
| DCWA CALOMET VALLEY (1850009) | 275 |
| HERON'S WALK PHASE 1 (SC1850017) | 231 |
| DCWS HIGHWAY 17A (SC1820009) | 200 |
| DCWS CALEB COURT (SC1850015) | 156 |
| SANDY RUN MHP (SC0860037) | 41 |
Frequently asked questions about Summerville tap water
Is Summerville tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Summerville. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Summerville?
9 public water suppliers report drinking-water monitoring for Summerville, South Carolina to the EPA. Each is listed above with its population served.
What contaminants are in Summerville's water?
The contaminants EPA monitoring detected in Summerville include Nitrate, Fluoride, Copper, Nitrate-Nitrite, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.