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 |
|---|---|---|---|
| Nitrate-Nitrite | 900 µg/L 9% of the EPA limit 10000 µg/L Main supplier: MARSHALL PWS · 12,934 people · 2019 | 1/3 | SYR4 |
| Fluoride | 660 µg/L 17% of the EPA limit 4000 µg/L Main supplier: MARSHALL PWS · 12,934 people · 2017 | 1/3 | SYR4 |
| Copper | 199.85 µg/L 15% of the EPA limit 1300 µg/L Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 270.4 µg/L — SALINE COUNTY PWSD 3 · 3,000 people · 2019 | 3/3 | SYR4 |
| TTHM | 104 µg/L 130% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 132.4 µg/L — SALINE COUNTY PWSD 1 · 480 people · 2019 | 3/3 | SYR4 |
| Barium | 76.85 µg/L 3.8% of the EPA limit 2000 µg/L Main supplier: MARSHALL PWS · 12,934 people · 2017 | 1/3 | SYR4 |
| Chloroform | 43.7 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 61.71 µg/L — SALINE COUNTY PWSD 1 · 480 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 47.54 µg/L 79% of the EPA limit 60 µg/L Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 47.81 µg/L — SALINE COUNTY PWSD 3 · 3,000 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 33.86 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 41.13 µg/L — SALINE COUNTY PWSD 1 · 480 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 24.72 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 29.1 µg/L — SALINE COUNTY PWSD 1 · 480 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 20.62 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 25.905 µg/L — SALINE COUNTY PWSD 1 · 480 people · 2019 | 3/3 | SYR4 |
| Monobromoacetic Acid | 15.68 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 22.025 µg/L — SALINE COUNTY PWSD 3 · 3,000 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 18.7 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019 | 1/3 | SYR4 |
| Lead | 9.687 µg/L 65% of the EPA limit 15 µg/L Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 16.78 µg/L — SALINE COUNTY PWSD 1 · 480 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 13.94 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019 | 3/3 | SYR4 |
| Lithium | 13.8 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2024 | 1/3 | UCMR-5 |
| Dibromoacetic Acid | 6.06 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 7.299 µg/L — SALINE COUNTY PWSD 3 · 3,000 people · 2019 | 3/3 | SYR4 |
| Bromoform | 4.599 µg/L No EPA limit set Main supplier: MARSHALL PWS · 12,934 people · 2019
Highest in the city: 6.033 µg/L — SALINE COUNTY PWSD 1 · 480 people · 2019 | 3/3 | SYR4 |
| Chromium | 2.785 µg/L 2.8% of the EPA limit 100 µg/L Main supplier: MARSHALL PWS · 12,934 people · 2017 | 1/3 | SYR4 |
| Lead | 0.0038 mg/L 25% of the EPA limit 0.0150 mg/L Main supplier: MARSHALL PWS · 12,934 people · 2025
Highest in the city: 0.0145 mg/L — SALINE COUNTY PWSD 1 · 480 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 Marshall
| Supplier | Population served |
|---|---|
| MARSHALL PWS | 12,934 |
| SALINE COUNTY PWSD 3 | 3,000 |
| SALINE COUNTY PWSD 1 | 480 |
Frequently asked questions about Marshall tap water
Is Marshall tap water safe to drink?
EPA testing detected 19 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?
3 public water suppliers report drinking-water monitoring for Marshall, Missouri 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 Nitrate-Nitrite, Fluoride, Copper, TTHM, 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.