What was found in Shell Knob'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-Nitrite | 30 µg/L 0.3% of the EPA limit 10000 µg/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019
Highest in the city: 570 µg/L — GREEN WOODS · 25 people · 2018 | 11/14 | SYR4 |
| Copper | 239 µg/L 18% of the EPA limit 1300 µg/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019
Highest in the city: 292.6 µg/L — FOX WOODS SUBDIVISION · 125 people · 2019 | 14/14 | SYR4 |
| Fluoride | 130 µg/L 3.3% of the EPA limit 4000 µg/L Highest in the city: CENTRAL CROSSING ACRES II · 25 people · 2019 | 4/14 | SYR4 |
| Nitrate | 30 µg/L 0.3% of the EPA limit 10000 µg/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019
Highest in the city: 130 µg/L — MO AMERICAN LAKEWOOD MANOR SUBD · 50 people · 2019 | 3/14 | SYR4 |
| Barium | 40.81 µg/L 2% of the EPA limit 2000 µg/L Highest in the city: CENTRAL CROSSING ACRES II · 25 people · 2019 | 11/14 | SYR4 |
| Lead | 4 µg/L 27% of the EPA limit 15 µg/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019
Highest in the city: 22.55 µg/L — FOX WOODS SUBDIVISION · 125 people · 2019 | 14/14 | SYR4 |
| TTHM | 0.7000 µg/L 0.9% of the EPA limit 80 µg/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019
Highest in the city: 21.72 µg/L — TWIN RIVERS SUBD · 72 people · 2017 | 6/14 | SYR4 |
| Chloroform | 0.7000 µg/L No EPA limit set Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019
Highest in the city: 17.863 µg/L — TWIN RIVERS SUBD · 72 people · 2019 | 10/14 | SYR4 |
| Bromodichloromethane | 10.074 µg/L No EPA limit set Highest in the city: GREEN SHORES SUBD · 120 people · 2019 | 6/14 | SYR4 |
| Gross Alpha, Excl. Radon And U | 7.265 pCi/L 48% of the EPA limit 15 pCi/L Highest in the city: MO AMERICAN OZARK MTN WATER COMPANY 1 · 350 people · 2012 | 1/14 | SYR4 |
| Chromium | 6.6455 µg/L 6.6% of the EPA limit 100 µg/L Highest in the city: BARRY COUNTY PWSD 2 · 34 people · 2019 | 11/14 | SYR4 |
| Cyanide | 6 µg/L 3% of the EPA limit 200 µg/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019 | 1/14 | SYR4 |
| Xylenes, Total | 5.51 µg/L 0.1% of the EPA limit 10000 µg/L Highest in the city: TWIN RIVERS SUBD · 72 people · 2019 | 5/14 | SYR4 |
| Dichloroacetic Acid | 1.5 µg/L No EPA limit set Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019
Highest in the city: 4.24 µg/L — OZARK VILLAS AT SHELL KNOB · 110 people · 2018 | 6/14 | SYR4 |
| Combined Uranium | 1.808 µg/L 6% of the EPA limit 30 µg/L Highest in the city: MO AMERICAN OZARK MTN WATER COMPANY 1 · 350 people · 2012 | 1/14 | SYR4 |
| Combined Radium (-226 And -228) | 1.8 pCi/L 36% of the EPA limit 5 pCi/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2016 | 4/14 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.49 µg/L 2.5% of the EPA limit 60 µg/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019 | 1/14 | SYR4 |
| Dibromochloromethane | 1.468 µg/L No EPA limit set Highest in the city: OZARK VILLAS AT SHELL KNOB · 110 people · 2019 | 5/14 | SYR4 |
| Monobromoacetic Acid | 1.3 µg/L No EPA limit set Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2019 | 1/14 | SYR4 |
| Arsenic | 1.18 µg/L 12% of the EPA limit 10 µg/L Highest in the city: SYCAMORE LANDING ASSN · 70 people · 2019 | 2/14 | SYR4 |
| Trichloroacetic Acid | 1.14 µg/L No EPA limit set Highest in the city: OZARK VILLAS AT SHELL KNOB · 110 people · 2018 | 1/14 | SYR4 |
| Ethylbenzene | 1.072 µg/L 0.2% of the EPA limit 700 µg/L Highest in the city: TWIN RIVERS SUBD · 72 people · 2019 | 2/14 | SYR4 |
| Styrene | 0.6300 µg/L 0.6% of the EPA limit 100 µg/L Highest in the city: CENTRAL CROSSING ACRES II · 25 people · 2019 | 2/14 | SYR4 |
| Lead | 0.0070 mg/L 47% of the EPA limit 0.0150 mg/L Main supplier: MO AMERICAN OZARK MTN WATER COMPANY 2 · 583 people · 2025 | 14/14 | 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 Shell Knob
| Supplier | Population served |
|---|---|
| MO AMERICAN OZARK MTN WATER COMPANY 2 | 583 |
| MO AMERICAN OZARK MTN WATER COMPANY 1 | 350 |
| KNOB HILL ACRES | 125 |
| FOX WOODS SUBDIVISION | 125 |
| GREEN SHORES SUBD | 120 |
| OZARK VILLAS AT SHELL KNOB | 110 |
| TWIN RIVERS SUBD | 72 |
| SYCAMORE LANDING ASSN | 70 |
| KINGS RIVER BEACH WATER ASSOCIATION INC | 50 |
| MO AMERICAN LAKEWOOD MANOR SUBD | 50 |
| SHELL ROCK UTILITIES | 45 |
| BARRY COUNTY PWSD 2 | 34 |
| CENTRAL CROSSING ACRES II | 25 |
| GREEN WOODS | 25 |
Frequently asked questions about Shell Knob tap water
Is Shell Knob tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Shell Knob. 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 Shell Knob?
14 public water suppliers report drinking-water monitoring for Shell Knob, Missouri to the EPA. Each is listed above with its population served.
What contaminants are in Shell Knob's water?
The contaminants EPA monitoring detected in Shell Knob include Nitrate-Nitrite, Copper, Fluoride, Nitrate, Barium. 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.