What was found in Knightdale's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 12000 µg/L 120% of the EPA limit, in the worst sample — 10000 µg/L | 32/34 | SYR4 |
| Nitrate-Nitrite | 12000 µg/L 120% of the EPA limit, in the worst sample — 10000 µg/L | 31/34 | SYR4 |
| Barium | 7000 µg/L 350% of the EPA limit, in the worst sample — 2000 µg/L | 9/34 | SYR4 |
| Copper | 6154 µg/L 473% of the EPA limit, in the worst sample — 1300 µg/L | 33/34 | SYR4 |
| Fluoride | 1600 µg/L 40% of the EPA limit 4000 µg/L | 32/34 | SYR4 |
| Combined Uranium | 268.2 µg/L 894% of the EPA limit, in the worst sample — 30 µg/L | 28/34 | SYR4 |
| Gross Alpha, Excl. Radon And U | 108 pCi/L 720% of the EPA limit, in the worst sample — 15 pCi/L | 3/34 | SYR4 |
| Xylenes, Total | 75 µg/L 0.8% of the EPA limit 10000 µg/L | 10/34 | SYR4 |
| Lead | 49 µg/L 327% of the EPA limit, in the worst sample — 15 µg/L | 19/34 | SYR4 |
| Tetrachloroethylene | 47 µg/L 940% of the EPA limit, in the worst sample — 5 µg/L | 3/34 | SYR4 |
| Gross Beta Particle Activity | 41.4 pCi/L No EPA limit set | 16/34 | SYR4 |
| Combined Radium (-226 And -228) | 28.9 pCi/L 578% of the EPA limit, in the worst sample — 5 pCi/L | 26/34 | SYR4 |
| TTHM | 20 µg/L 25% of the EPA limit 80 µg/L | 20/34 | SYR4 |
| Total Haloacetic Acids (HAA5) | 17 µg/L 28% of the EPA limit 60 µg/L | 10/34 | SYR4 |
| Ethylbenzene | 15.8 µg/L 2.3% of the EPA limit 700 µg/L | 5/34 | SYR4 |
| Dichloroacetic Acid | 8.9 µg/L No EPA limit set | 6/34 | SYR4 |
| Toluene | 6.4 µg/L 0.6% of the EPA limit 1000 µg/L | 3/34 | SYR4 |
| Dibromoacetic Acid | 6.3 µg/L No EPA limit set | 7/34 | SYR4 |
| Chloroform | 6 µg/L No EPA limit set | 12/34 | SYR4 |
| Dichloromethane | 5.5 µg/L 110% of the EPA limit, in the worst sample — 5 µg/L | 2/34 | SYR4 |
| Antimony, Total | 4.44 µg/L 74% of the EPA limit 6 µg/L | 2/34 | SYR4 |
| Bromodichloromethane | 3.8 µg/L No EPA limit set | 11/34 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.1 µg/L 52% of the EPA limit 6 µg/L | 2/34 | SYR4 |
| Bromoform | 3 µg/L No EPA limit set | 7/34 | SYR4 |
| Dibromochloromethane | 3 µg/L No EPA limit set | 12/34 | SYR4 |
| 1,2-Dichloropropane | 2.7 µg/L 54% of the EPA limit 5 µg/L | 2/34 | SYR4 |
| Trichloroacetic Acid | 2.1 µg/L No EPA limit set | 1/34 | SYR4 |
| Chlordane | 1.75 µg/L 88% of the EPA limit 2 µg/L | 2/34 | SYR4 |
| Selenium | 1.5 µg/L 3% of the EPA limit 50 µg/L | 2/34 | SYR4 |
| Thallium, Total | 1.16 µg/L 58% of the EPA limit 2 µg/L | 2/34 | SYR4 |
| Ethylene Dibromide | 0.5700 µg/L 1140% of the EPA limit, in the worst sample — 0.0500 µg/L | 1/34 | SYR4 |
| Mercury | 0.3500 µg/L 18% of the EPA limit 2 µg/L | 1/34 | SYR4 |
| Heptachlor Epoxide | 0.0540 µg/L 27% of the EPA limit 0.2000 µg/L | 4/34 | SYR4 |
| Lead | 0.0100 mg/L 67% of the EPA limit 0.0150 mg/L | 34/34 | 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 single worst sample on
record — 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 Knightdale
| Supplier | Population served |
|---|---|
| ROCKBRIDGE S/D | 1,042 |
| AMBER ACRES NORTH S/D | 752 |
| AMBER RIDGE S/D | 742 |
| SANDY TRAIL S/D | 739 |
| RUTLEDGE LANDING S/D | 713 |
| ASHLEY HILLS NORTH S/D | 602 |
| BAYWOOD FOREST S/D | 533 |
| BARCLAY DOWNS S/D | 459 |
| RIDGEHAVEN S/D | 455 |
| ASHLEY HILLS S/D | 453 |
| KINGS GRANT S/D | 412 |
| RUTLEDGE LANDING NORTH | 389 |
| ACRES OF SPACE MHP | 332 |
| OLD MILBURNIE CROSSING S/D | 262 |
| AMBER ACRES | 239 |
| VILLAGE SQUIRE MOBILE ESTATES | 232 |
| VALLEY WOODS MHP | 224 |
| COTTONWOOD S/D | 203 |
| MOOREFIELD S/D | 181 |
| CREEKSIDE MOBILE VILLAGE | 165 |
| THORNBURG S/D | 160 |
| HIDDEN HOLLOW S/D | 123 |
| OAK GROVE OF KNIGHTDALE | 122 |
| SHADY ACRES MH VILLAGE | 115 |
| SUMMERFIELD MHP | 110 |
| AUBURN HILLS S/D | 94 |
| PRESERVE AT LONG BRANCH | 90 |
| MEAD-O-VIEW MHP | 90 |
| COUNTRY SQUIRE ESTATES | 85 |
| MEADOW GLEN S/D | 84 |
| OAKES PLANTATION S/D | 60 |
| EL CAMINO ACRES S/D | 49 |
| PINE COUNTRY ESTATES | 44 |
| CAMELOT MHP | 34 |
Frequently asked questions about Knightdale tap water
Is Knightdale tap water safe to drink?
EPA testing detected 34 contaminants in the water serving Knightdale. 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 Knightdale?
34 public water suppliers report drinking-water monitoring for Knightdale, North Carolina to the EPA. Each is listed above with its population served.
What contaminants are in Knightdale's water?
The contaminants EPA monitoring detected in Knightdale include Nitrate, Nitrate-Nitrite, Barium, Copper, Fluoride. The full list, with the highest level found 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.