What was found in Marietta'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 | 1610 µg/L 16% of the EPA limit 10000 µg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 10000 µg/L — PUTNAM COMMUNITY WATER ASSOCIATION PWS · 2,744 people · 2019 | 3/6 | SYR4 |
| Nitrate-Nitrite | 1571 µg/L 16% of the EPA limit 10000 µg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 10000 µg/L — PUTNAM COMMUNITY WATER ASSOCIATION PWS · 2,744 people · 2019 | 3/6 | SYR4 |
| Fluoride | 1036.3 µg/L 26% of the EPA limit 4000 µg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 1053 µg/L — WARREN COMM W AND S ASSN 2 · 7,215 people · 2019 | 2/6 | SYR4 |
| Copper | 38 µg/L 2.9% of the EPA limit 1300 µg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2018
Highest in the city: 246.3 µg/L — WARREN COMM W AND S ASSN 2 · 7,215 people · 2017 | 5/6 | SYR4 |
| Barium | 10.95 µg/L 0.5% of the EPA limit 2000 µg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 116.26 µg/L — PUTNAM COMMUNITY WATER ASSOCIATION PWS · 2,744 people · 2019 | 3/6 | SYR4 |
| TTHM | 56.76 µg/L 71% of the EPA limit 80 µg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 64 µg/L — RENO WATER AND SEWER - KARDEX · 446 people · 2018 | 6/6 | SYR4 |
| Lead | 2.544 µg/L 17% of the EPA limit 15 µg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2018
Highest in the city: 49.5 µg/L — PUTNAM COMMUNITY WATER ASSOCIATION PWS · 2,744 people · 2019 | 4/6 | SYR4 |
| Chloroform | 16.17 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 22.425 µg/L — RENO WATER AND SEWER - KARDEX · 446 people · 2018 | 6/6 | SYR4 |
| Dibromochloromethane | 18.87 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 21.85 µg/L — RENO WATER AND SEWER - KARDEX · 446 people · 2018 | 6/6 | SYR4 |
| Bromodichloromethane | 16.335 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 19.025 µg/L — RENO WATER AND SEWER - KARDEX · 446 people · 2018 | 6/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 12.705 µg/L 21% of the EPA limit 60 µg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 12.975 µg/L — RENO WATER AND SEWER - KARDEX · 446 people · 2018 | 4/6 | SYR4 |
| Bromoform | 10.475 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019 | 6/6 | SYR4 |
| Dibromoacetic Acid | 6.44 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 7.975 µg/L — RENO WATER AND SEWER - KARDEX · 446 people · 2018 | 6/6 | SYR4 |
| Dichloroacetic Acid | 5.355 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 5.995 µg/L — RENO WATER AND SEWER 1 · 2,189 people · 2018 | 6/6 | SYR4 |
| Monochloroacetic Acid | 4.31 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019 | 1/6 | SYR4 |
| Monobromoacetic Acid | 4 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019 | 2/6 | SYR4 |
| Trichloroacetic Acid | 2.33 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2019
Highest in the city: 2.475 µg/L — WARREN COMM W AND S ASSN 2 · 7,215 people · 2019 | 5/6 | SYR4 |
| Xylenes, Total | 1.802 µg/L 0% of the EPA limit 10000 µg/L Highest in the city: PUTNAM COMMUNITY WATER ASSOCIATION PWS · 2,744 people · 2019 | 1/6 | SYR4 |
| PFOA | 0.0052 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2025
Highest in the city: 0.0200 µg/L — WARREN COMM W AND S ASSN 2 · 7,215 people · 2023 | 3/6 | UCMR-5 |
| Lead | 0.00060 mg/L 4% of the EPA limit 0.0150 mg/L Main supplier: MARIETTA CITY PWS · 18,707 people · 2026
Highest in the city: 0.0066 mg/L — PUTNAM COMMUNITY WATER ASSOCIATION PWS · 2,744 people · 2025 | 6/6 | LCR |
| PFBS | 0.0047 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2025
Highest in the city: 0.0063 µg/L — WARREN COMM W AND S ASSN 2 · 7,215 people · 2023 | 2/6 | UCMR-5 |
| PFOS | 0.0056 µg/L No EPA limit set Main supplier: MARIETTA CITY PWS · 18,707 people · 2025 | 1/6 | UCMR-5 |
| PFHXS | 0.0035 µg/L No EPA limit set Highest in the city: PUTNAM COMMUNITY WATER ASSOCIATION PWS · 2,744 people · 2023 | 1/6 | UCMR-5 |
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 Marietta
| Supplier | Population served |
|---|---|
| MARIETTA CITY PWS | 18,707 |
| WARREN COMM W AND S ASSN 2 | 7,215 |
| PUTNAM COMMUNITY WATER ASSOCIATION PWS | 2,744 |
| RENO WATER AND SEWER 1 | 2,189 |
| RENO WATER AND SEWER 2 | 1,520 |
| RENO WATER AND SEWER - KARDEX | 446 |
Frequently asked questions about Marietta tap water
Is Marietta tap water safe to drink?
EPA testing detected 23 contaminants in the water serving Marietta. 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 Marietta?
6 public water suppliers report drinking-water monitoring for Marietta, Ohio to the EPA. Each is listed above with its population served.
What contaminants are in Marietta's water?
The contaminants EPA monitoring detected in Marietta include Nitrate, Nitrate-Nitrite, Fluoride, Copper, 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.