What was found in Williamston'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 |
|---|---|---|---|
| Fluoride | 2050 µg/L 51% of the EPA limit 4000 µg/L Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2018 | 3/5 | SYR4 |
| Copper | 344 µg/L 26% of the EPA limit 1300 µg/L Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2017
Highest in the city: 407.6 µg/L — MARTIN CO WATER & SEWER DIST I · 2,245 people · 2018 | 3/5 | SYR4 |
| Barium | 147 µg/L 7.4% of the EPA limit 2000 µg/L Highest in the city: MARTIN CO WATER & SEWER DIST I · 2,245 people · 2019 | 1/5 | SYR4 |
| TTHM | 75.2 µg/L 94% of the EPA limit 80 µg/L Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019
Highest in the city: 84.05 µg/L — MARTIN CO WATER & SEWER DIST 2 · 2,746 people · 2019 | 3/5 | SYR4 |
| Bromoform | 41.5 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019
Highest in the city: 55 µg/L — MARTIN CO WATER & SEWER DIST 2 · 2,746 people · 2019 | 3/5 | SYR4 |
| Nitrate | 50 µg/L 0.5% of the EPA limit 10000 µg/L Highest in the city: MARTIN CO REGIONAL WASA · 0 people · 2019 | 1/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 31.175 µg/L 52% of the EPA limit 60 µg/L Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019
Highest in the city: 36.76 µg/L — MARTIN CO WATER & SEWER DIST 2 · 2,746 people · 2019 | 3/5 | SYR4 |
| Chloroform | 30.97 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019
Highest in the city: 32.41 µg/L — MARTIN CO WATER & SEWER DIST 2 · 2,746 people · 2019 | 3/5 | SYR4 |
| Dichloroacetic Acid | 20.56 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019
Highest in the city: 26.06 µg/L — MARTIN CO WATER & SEWER DIST 2 · 2,746 people · 2019 | 3/5 | SYR4 |
| Dibromochloromethane | 25.6 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019 | 3/5 | SYR4 |
| Trichloroacetic Acid | 14.04 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019
Highest in the city: 15.52 µg/L — MARTIN CO WATER & SEWER DIST 2 · 2,746 people · 2019 | 3/5 | SYR4 |
| Bromodichloromethane | 12.24 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019
Highest in the city: 14.6 µg/L — MARTIN CO WATER & SEWER DIST I · 2,245 people · 2019 | 3/5 | SYR4 |
| Dibromoacetic Acid | 10.85 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019 | 3/5 | SYR4 |
| Lead | 7.7 µg/L 51% of the EPA limit 15 µg/L Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2017
Highest in the city: 10 µg/L — MARTIN CO WATER & SEWER DIST 2 · 2,746 people · 2017 | 2/5 | SYR4 |
| Lithium | 9.03 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2023 | 1/5 | UCMR-5 |
| Monochloroacetic Acid | 2.66 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019
Highest in the city: 2.96 µg/L — MARTIN CO WATER & SEWER DIST 2 · 2,746 people · 2019 | 2/5 | SYR4 |
| Dichloromethane | 2.82 µg/L 56% of the EPA limit 5 µg/L Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019 | 1/5 | SYR4 |
| Xylenes, Total | 1.3 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: MARTIN CO REGIONAL WASA · 0 people · 2019 | 1/5 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2019 | 1/5 | SYR4 |
| PFOS | 0.0048 µg/L No EPA limit set Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2024 | 1/5 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: WILLIAMSTON, TOWN OF · 7,650 people · 2025 | 3/5 | 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 Williamston
| Supplier | Population served |
|---|---|
| WILLIAMSTON, TOWN OF | 7,650 |
| MARTIN CO WATER & SEWER DIST 2 | 2,746 |
| MARTIN CO WATER & SEWER DIST I | 2,245 |
| MARTIN CO REGIONAL WASA | 0 |
| MARTIN CO. REGIONAL WASA AUTHORITY WELL | 0 |
Frequently asked questions about Williamston tap water
Is Williamston tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Williamston. 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 Williamston?
5 public water suppliers report drinking-water monitoring for Williamston, North Carolina to the EPA. Each is listed above with its population served.
What contaminants are in Williamston's water?
The contaminants EPA monitoring detected in Williamston include Fluoride, Copper, Barium, TTHM, Bromoform. 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.