What was found in Marengo'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 | 1000 µg/L 10% of the EPA limit 10000 µg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019
Highest in the city: 5805 µg/L — IOWA VALLEY ESTATES · 46 people · 2019 | 2/2 | SYR4 |
| Copper | 413.55 µg/L 32% of the EPA limit 1300 µg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2017
Highest in the city: 478 µg/L — IOWA VALLEY ESTATES · 46 people · 2017 | 2/2 | SYR4 |
| Fluoride | 200 µg/L 5% of the EPA limit 4000 µg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2016 | 2/2 | SYR4 |
| Barium | 97.4 µg/L 4.9% of the EPA limit 2000 µg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2016
Highest in the city: 110 µg/L — IOWA VALLEY ESTATES · 46 people · 2014 | 2/2 | SYR4 |
| TTHM | 40.075 µg/L 50% of the EPA limit 80 µg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Chloroform | 28.475 µg/L No EPA limit set Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 24.4 µg/L 41% of the EPA limit 60 µg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 13 µg/L No EPA limit set Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 9.129 µg/L No EPA limit set Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 8.7575 µg/L No EPA limit set Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 5.9875 µg/L No EPA limit set Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Lead | 3.375 µg/L 23% of the EPA limit 15 µg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2017
Highest in the city: 5.25 µg/L — IOWA VALLEY ESTATES · 46 people · 2017 | 2/2 | SYR4 |
| Trichloroacetic Acid | 4.4125 µg/L No EPA limit set Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Selenium | 3.1 µg/L 6.2% of the EPA limit 50 µg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2016 | 1/2 | SYR4 |
| Dibromoacetic Acid | 2.351 µg/L No EPA limit set Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.8 pCi/L 36% of the EPA limit 5 pCi/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2018 | 1/2 | SYR4 |
| Bromoform | 1.5725 µg/L No EPA limit set Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0012 mg/L 8% of the EPA limit 0.0150 mg/L Main supplier: MARENGO WATER SUPPLY · 2,435 people · 2023
Highest in the city: 0.0080 mg/L — IOWA VALLEY ESTATES · 46 people · 2025 | 2/2 | LCR |
Water suppliers serving Marengo
| Supplier | Population served |
|---|---|
| MARENGO WATER SUPPLY | 2,435 |
| IOWA VALLEY ESTATES | 46 |
Frequently asked questions about Marengo tap water
Is Marengo tap water safe to drink?
EPA testing detected 18 contaminants in the water serving Marengo. 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 Marengo?
2 public water suppliers report drinking-water monitoring for Marengo, Iowa to the EPA. Each is listed above with its population served.
What contaminants are in Marengo's water?
The contaminants EPA monitoring detected in Marengo include Nitrate, Copper, Fluoride, Barium, 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.