What was found in Mount Vernon'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 | 535.2 µg/L 5.4% of the EPA limit 10000 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 4/4 | SYR4 |
| Fluoride | 119.6 µg/L 3% of the EPA limit 4000 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 226.15 µg/L — CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2019 | 4/4 | SYR4 |
| Copper | 60.875 µg/L 4.7% of the EPA limit 1300 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 171.4 µg/L — CYPRESS SPRINGS SUD PINE VALLEY · 276 people · 2017 | 4/4 | SYR4 |
| Cyanide | 144.4 µg/L 72% of the EPA limit 200 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 3/4 | SYR4 |
| TTHM | 92.33 µg/L 115% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 95.31 µg/L — CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 75.58 µg/L 126% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 4/4 | SYR4 |
| Chloroform | 66.545 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 74.895 µg/L — CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2019 | 4/4 | SYR4 |
| Barium | 64.65 µg/L 3.2% of the EPA limit 2000 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 57.95 µg/L 0.6% of the EPA limit 10000 µg/L Highest in the city: CYPRESS SPRINGS SUD PINE VALLEY · 276 people · 2015 | 1/4 | SYR4 |
| Dichloroacetic Acid | 44.46 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 4/4 | SYR4 |
| Trichloroacetic Acid | 27.82 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 4/4 | SYR4 |
| Bromoform | 18.9 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 22.67 µg/L — CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2019 | 3/4 | SYR4 |
| Bromodichloromethane | 19.555 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 20.54 µg/L — CITY OF MOUNT VERNON · 2,662 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 4.726 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 9.11 µg/L — CITY OF MOUNT VERNON · 2,662 people · 2019 | 4/4 | SYR4 |
| Nitrite | 8 µg/L 0.8% of the EPA limit 1000 µg/L Highest in the city: CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2013 | 1/4 | SYR4 |
| Gross Beta Particle Activity | 5.3 pCi/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2017
Highest in the city: 7.1 pCi/L — CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2015 | 3/4 | SYR4 |
| Lead | 6.068 µg/L 40% of the EPA limit 15 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 6.906 µg/L — CITY OF MOUNT VERNON · 2,662 people · 2019 | 3/4 | SYR4 |
| Monochloroacetic Acid | 5.645 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 2.01 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 3.345 µg/L — CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2019 | 4/4 | SYR4 |
| Monobromoacetic Acid | 1.485 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 2.895 µg/L — CITY OF MOUNT VERNON · 2,662 people · 2019 | 3/4 | SYR4 |
| Selenium | 1.5845 µg/L 3.2% of the EPA limit 50 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 2 µg/L — CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2019 | 3/4 | SYR4 |
| Xylenes, Total | 1.248 µg/L 0% of the EPA limit 10000 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 1.952 µg/L — CYPRESS SPRINGS SUD PINE VALLEY · 276 people · 2019 | 2/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Highest in the city: CITY OF MOUNT VERNON · 2,662 people · 2015 | 2/4 | SYR4 |
| Arsenic | 1.26 µg/L 13% of the EPA limit 10 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019
Highest in the city: 1.425 µg/L — CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2019 | 2/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.24 µg/L 21% of the EPA limit 6 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 2/4 | SYR4 |
| Ethylbenzene | 0.6400 µg/L 0.1% of the EPA limit 700 µg/L Highest in the city: CYPRESS SPRINGS SUD PINE VALLEY · 276 people · 2019 | 1/4 | SYR4 |
| Chromium | 0.6316 µg/L 0.6% of the EPA limit 100 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 2/4 | SYR4 |
| Asbestos | 0.1987 MFL 2.8% of the EPA limit 7 MFL Highest in the city: CYPRESS SPRINGS SUD SOUTH PLANT · 1,821 people · 2013 | 1/4 | SYR4 |
| Hexachlorocyclopentadiene | 0.1000 µg/L 0.2% of the EPA limit 50 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 1/4 | SYR4 |
| Atrazine | 0.0990 µg/L 3.3% of the EPA limit 3 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 1/4 | SYR4 |
| Thallium, Total | 0.0120 µg/L 0.6% of the EPA limit 2 µg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2019 | 1/4 | SYR4 |
| Pfpea | 0.0045 µg/L No EPA limit set Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2025 | 1/4 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA · 13,698 people · 2025 | 4/4 | 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 Mount Vernon
| Supplier | Population served |
|---|---|
| CYPRESS SPRINGS SUD N PLANT 1 AND NE PLA | 13,698 |
| CITY OF MOUNT VERNON | 2,662 |
| CYPRESS SPRINGS SUD SOUTH PLANT | 1,821 |
| CYPRESS SPRINGS SUD PINE VALLEY | 276 |
Frequently asked questions about Mount Vernon tap water
Is Mount Vernon tap water safe to drink?
EPA testing detected 33 contaminants in the water serving Mount Vernon. 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 Mount Vernon?
4 public water suppliers report drinking-water monitoring for Mount Vernon, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Mount Vernon's water?
The contaminants EPA monitoring detected in Mount Vernon include Nitrate, Fluoride, Copper, Cyanide, TTHM. 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.