What was found in Silverton'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 | 3153 µg/L 79% of the EPA limit 4000 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2018 | 2/3 | SYR4 |
| TTHM | 236.15 µg/L 295% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Nitrate | 214 µg/L 2.1% of the EPA limit 10000 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2019 | 2/3 | SYR4 |
| Barium | 206.5 µg/L 10% of the EPA limit 2000 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 160.05 µg/L 267% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Chloroform | 159.45 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Cyanide | 141.8 µg/L 71% of the EPA limit 200 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2019 | 2/3 | SYR4 |
| Dichloroacetic Acid | 95.085 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 2/3 | SYR4 |
| Copper | 63 µg/L 4.8% of the EPA limit 1300 µg/L Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 52.32 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 44.61 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 2/3 | SYR4 |
| Dibromochloromethane | 40.295 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 38.4 µg/L 0.4% of the EPA limit 10000 µg/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2015 | 1/3 | SYR4 |
| Monochloroacetic Acid | 33.83 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Gross Beta Particle Activity | 31.9 pCi/L No EPA limit set Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2019 | 2/3 | SYR4 |
| Bromoform | 18.85 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 17.925 µg/L 60% of the EPA limit 30 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 14.56 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Selenium | 10.8 µg/L 22% of the EPA limit 50 µg/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 2/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.95 pCi/L 46% of the EPA limit 15 pCi/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 1/3 | SYR4 |
| Chromium | 6.225 µg/L 6.2% of the EPA limit 100 µg/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 2/3 | SYR4 |
| Arsenic | 4.1495 µg/L 41% of the EPA limit 10 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2019 | 2/3 | SYR4 |
| Monobromoacetic Acid | 3.575 µg/L No EPA limit set Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 2/3 | SYR4 |
| Lead | 2.81 µg/L 19% of the EPA limit 15 µg/L Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2019 | 3/3 | SYR4 |
| Xylenes, Total | 1.13 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.0735 pCi/L 21% of the EPA limit 5 pCi/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 1/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.6900 µg/L 12% of the EPA limit 6 µg/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 1/3 | SYR4 |
| Thallium, Total | 0.6201 µg/L 31% of the EPA limit 2 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2019 | 1/3 | SYR4 |
| Antimony, Total | 0.6086 µg/L 10% of the EPA limit 6 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2019 | 1/3 | SYR4 |
| Atrazine | 0.2720 µg/L 9.1% of the EPA limit 3 µg/L Highest in the city: MACKENZIE MUNICIPAL WATER AUTHORITY · 126 people · 2018 | 1/3 | SYR4 |
| Heptachlor Epoxide | 0.1000 µg/L 50% of the EPA limit 0.2000 µg/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 1/3 | SYR4 |
| Endrin | 0.0400 µg/L 2% of the EPA limit 2 µg/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 1/3 | SYR4 |
| Bhc-Gamma | 0.0300 µg/L 15% of the EPA limit 0.2000 µg/L Highest in the city: CORONADO SHORES WATER SYSTEM · 85 people · 2019 | 1/3 | SYR4 |
| Lead | 0.0013 mg/L 8.7% of the EPA limit 0.0150 mg/L Main supplier: SILVERTON MUNICIPAL WATER SYSTEM · 597 people · 2025 | 3/3 | 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 Silverton
| Supplier | Population served |
|---|---|
| SILVERTON MUNICIPAL WATER SYSTEM | 597 |
| MACKENZIE MUNICIPAL WATER AUTHORITY | 126 |
| CORONADO SHORES WATER SYSTEM | 85 |
Frequently asked questions about Silverton tap water
Is Silverton tap water safe to drink?
EPA testing detected 34 contaminants in the water serving Silverton. 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 Silverton?
3 public water suppliers report drinking-water monitoring for Silverton, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Silverton's water?
The contaminants EPA monitoring detected in Silverton include Fluoride, TTHM, Nitrate, Barium, Total Haloacetic Acids (HAA5). 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.