What was found in Troy'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 | 2318 µg/L 58% of the EPA limit 4000 µg/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 3280 µg/L — SUMMERS CROSSING SUBDIVISION · 40 people · 2018 | 12/13 | SYR4 |
| Nitrate-Nitrite | 62 µg/L 0.6% of the EPA limit 10000 µg/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 1390 µg/L — PINE LAKE ESTATES · 115 people · 2019 | 12/13 | SYR4 |
| Copper | 161.6 µg/L 12% of the EPA limit 1300 µg/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 385 µg/L — TARA VALLEY HOMEOWNERS ASSN · 60 people · 2019 | 13/13 | SYR4 |
| Lithium | 251 µg/L No EPA limit set Main supplier: TROY PWS · 15,000 people · 2024 | 2/13 | UCMR-5 |
| Barium | 27.7 µg/L 1.4% of the EPA limit 2000 µg/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 82.655 µg/L — DEER VALLEY SUBDIVISION · 65 people · 2017 | 12/13 | SYR4 |
| Selenium | 10.206 µg/L 20% of the EPA limit 50 µg/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 43.94 µg/L — PINE LAKE ESTATES · 115 people · 2018 | 3/13 | SYR4 |
| Gross Alpha, Excl. Radon And U | 18.14 pCi/L 121% of the EPA limit, at the 95th percentile of samples — 15 pCi/L Main supplier: TROY PWS · 15,000 people · 2017
Highest in the city: 38.365 pCi/L — TARA VALLEY HOMEOWNERS ASSN · 60 people · 2019 | 7/13 | SYR4 |
| Combined Uranium | 1.788 µg/L 6% of the EPA limit 30 µg/L Main supplier: TROY PWS · 15,000 people · 2017
Highest in the city: 15.186079999999999 µg/L — PINE LAKE ESTATES · 115 people · 2019 | 3/13 | SYR4 |
| TTHM | 6.659999999999997 µg/L 8.3% of the EPA limit 80 µg/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 9.395 µg/L — LINCOLN COUNTY PWSD 2 · 875 people · 2019 | 2/13 | SYR4 |
| Lead | 4.715 µg/L 31% of the EPA limit 15 µg/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 9.286999999999999 µg/L — BUELAH LAND ESTATES · 67 people · 2018 | 13/13 | SYR4 |
| Combined Radium (-226 And -228) | 4.4 pCi/L 88% of the EPA limit 5 pCi/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 7.6 pCi/L — TARA VALLEY HOMEOWNERS ASSN · 60 people · 2019 | 12/13 | SYR4 |
| Chromium | 7.5255 µg/L 7.5% of the EPA limit 100 µg/L Main supplier: TROY PWS · 15,000 people · 2019 | 10/13 | SYR4 |
| Arsenic | 4.6915 µg/L 47% of the EPA limit 10 µg/L Main supplier: TROY PWS · 15,000 people · 2019 | 2/13 | SYR4 |
| Dibromoacetic Acid | 1.31 µg/L No EPA limit set Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 4.673499999999999 µg/L — LINCOLN COUNTY PWSD 2 · 875 people · 2019 | 2/13 | SYR4 |
| Bromoform | 3.7569999999999997 µg/L No EPA limit set Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 4.585 µg/L — LINCOLN COUNTY PWSD 2 · 875 people · 2019 | 3/13 | SYR4 |
| Dibromochloromethane | 2.778 µg/L No EPA limit set Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 3.72 µg/L — TARA VALLEY HOMEOWNERS ASSN · 60 people · 2017 | 3/13 | SYR4 |
| Cadmium | 3.4 µg/L 68% of the EPA limit 5 µg/L Main supplier: TROY PWS · 15,000 people · 2019 | 1/13 | SYR4 |
| Bromodichloromethane | 1.515 µg/L No EPA limit set Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 2.68 µg/L — TARA VALLEY HOMEOWNERS ASSN · 60 people · 2017 | 3/13 | SYR4 |
| Total Haloacetic Acids (HAA5) | 1.31 µg/L 2.2% of the EPA limit 60 µg/L Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 2.03 µg/L — LINCOLN COUNTY PWSD 2 · 875 people · 2019 | 2/13 | SYR4 |
| Chloroform | 0.5100 µg/L No EPA limit set Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 1.41 µg/L — LINCOLN COUNTY PWSD 2 · 875 people · 2019 | 3/13 | SYR4 |
| Dichloroacetic Acid | 1.09 µg/L No EPA limit set Main supplier: TROY PWS · 15,000 people · 2019
Highest in the city: 1.21 µg/L — LINCOLN COUNTY PWSD 2 · 875 people · 2019 | 2/13 | SYR4 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: TROY PWS · 15,000 people · 2025
Highest in the city: 0.0052 mg/L — LINCOLN COUNTY PWSD 2 · 875 people · 2023 | 13/13 | 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 Troy
| Supplier | Population served |
|---|---|
| TROY PWS | 15,000 |
| LINCOLN COUNTY PWSD 2 | 875 |
| ROCKPORT SUBDIVISION | 204 |
| BENNINGTON ESTATES | 185 |
| HOMETOWN COURT | 152 |
| PINE LAKE ESTATES | 115 |
| LAKE FOREST SUBDIVISION | 100 |
| WESTMIER SUBDIVISION | 90 |
| BUELAH LAND ESTATES | 67 |
| BROOK HILL SUBDIVISION | 65 |
| DEER VALLEY SUBDIVISION | 65 |
| TARA VALLEY HOMEOWNERS ASSN | 60 |
| SUMMERS CROSSING SUBDIVISION | 40 |
Frequently asked questions about Troy tap water
Is Troy tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Troy. 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 Troy?
13 public water suppliers report drinking-water monitoring for Troy, Missouri to the EPA. Each is listed above with its population served.
What contaminants are in Troy's water?
The contaminants EPA monitoring detected in Troy include Fluoride, Nitrate-Nitrite, Copper, Lithium, 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.