What was found in Marshall'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 |
|---|---|---|---|
| Copper | 147.5 µg/L 11% of the EPA limit 1300 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 751 µg/L — TALLEY WSC · 1,737 people · 2019 | 4/4 | SYR4 |
| Fluoride | 506.9 µg/L 13% of the EPA limit 4000 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 722.85 µg/L — GILL WSC · 2,640 people · 2017 | 4/4 | SYR4 |
| Barium | 65 µg/L 3.3% of the EPA limit 2000 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 444.4 µg/L — HOLIDAY SPRINGS MOBILE HOME PARK · 252 people · 2018 | 4/4 | SYR4 |
| Nitrate | 301 µg/L 3% of the EPA limit 10000 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019 | 4/4 | SYR4 |
| TTHM | 104.14 µg/L 130% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 141.35 µg/L — GILL WSC · 2,640 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 83.56 µg/L 0.8% of the EPA limit 10000 µg/L Highest in the city: TALLEY WSC · 1,737 people · 2019 | 3/4 | SYR4 |
| Chloroform | 80.68 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 68.41 µg/L 114% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 6.32 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 58.75 µg/L — GILL WSC · 2,640 people · 2019 | 4/4 | SYR4 |
| Cyanide | 42.1145 µg/L 21% of the EPA limit 200 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019 | 3/4 | SYR4 |
| Bromodichloromethane | 26.39 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 41.145 µg/L — GILL WSC · 2,640 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 40.15 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2019 | 4/4 | SYR4 |
| Bromoform | 31.72 µg/L No EPA limit set Highest in the city: GILL WSC · 2,640 people · 2019 | 3/4 | SYR4 |
| Trichloroacetic Acid | 23.81 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 25.75 µg/L — TALLEY WSC · 1,737 people · 2019 | 4/4 | SYR4 |
| Lead | 22.4 µg/L 149% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019 | 3/4 | SYR4 |
| Nitrite | 22 µg/L 2.2% of the EPA limit 1000 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2013 | 2/4 | SYR4 |
| Monochloroacetic Acid | 4.825 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 14.86 µg/L — GILL WSC · 2,640 people · 2019 | 4/4 | SYR4 |
| Dibromoacetic Acid | 2.24 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 12.635 µg/L — GILL WSC · 2,640 people · 2019 | 4/4 | SYR4 |
| Gross Beta Particle Activity | 7.655 pCi/L No EPA limit set Highest in the city: HOLIDAY SPRINGS MOBILE HOME PARK · 252 people · 2018 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: CITY OF MARSHALL · 23,091 people · 2017
Highest in the city: 2.79 pCi/L — HOLIDAY SPRINGS MOBILE HOME PARK · 252 people · 2018 | 4/4 | SYR4 |
| Chromium | 2.6 µg/L 2.6% of the EPA limit 100 µg/L Highest in the city: TALLEY WSC · 1,737 people · 2018 | 1/4 | SYR4 |
| Selenium | 2.27 µg/L 4.5% of the EPA limit 50 µg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2019 | 1/4 | SYR4 |
| Monobromoacetic Acid | 1.2 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2019
Highest in the city: 1.7 µg/L — GILL WSC · 2,640 people · 2019 | 4/4 | SYR4 |
| Arsenic | 1.1 µg/L 11% of the EPA limit 10 µg/L Highest in the city: GILL WSC · 2,640 people · 2019 | 1/4 | SYR4 |
| Antimony, Total | 0.4600 µg/L 7.7% of the EPA limit 6 µg/L Highest in the city: GILL WSC · 2,640 people · 2019 | 1/4 | SYR4 |
| Pfpea | 0.0072 µg/L No EPA limit set Main supplier: CITY OF MARSHALL · 23,091 people · 2025 | 1/4 | UCMR-5 |
| Lead | 0.0021 mg/L 14% of the EPA limit 0.0150 mg/L Main supplier: CITY OF MARSHALL · 23,091 people · 2022 | 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 Marshall
| Supplier | Population served |
|---|---|
| CITY OF MARSHALL | 23,091 |
| GILL WSC | 2,640 |
| TALLEY WSC | 1,737 |
| HOLIDAY SPRINGS MOBILE HOME PARK | 252 |
Frequently asked questions about Marshall tap water
Is Marshall tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Marshall. 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 Marshall?
4 public water suppliers report drinking-water monitoring for Marshall, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Marshall's water?
The contaminants EPA monitoring detected in Marshall include Copper, Fluoride, Barium, Nitrate, 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.