What was found in Cottage Grove'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 | 1170 µg/L 12% of the EPA limit 10000 µg/L Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Fluoride | 1145 µg/L 29% of the EPA limit 4000 µg/L Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Copper | 91.25 µg/L 7% of the EPA limit 1300 µg/L Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 12.7 pCi/L 85% of the EPA limit 15 pCi/L Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Lead | 6.1 µg/L 41% of the EPA limit 15 µg/L Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Arsenic | 4.2215 µg/L 42% of the EPA limit 10 µg/L Main supplier: Cottage Grove · 42,760 people · 2018 | 1/1 | SYR4 |
| Dibromochloromethane | 3.36 µg/L No EPA limit set Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 2.62 µg/L No EPA limit set Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 2.38 µg/L No EPA limit set Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Bromoform | 2.29 µg/L No EPA limit set Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Chloroform | 1.385 µg/L No EPA limit set Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.155 µg/L 19% of the EPA limit 6 µg/L Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 1 µg/L No EPA limit set Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 0.4515 µg/L 9% of the EPA limit 5 µg/L Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| cis-1,2-Dichloroethylene | 0.3400 µg/L 0.5% of the EPA limit 70 µg/L Main supplier: Cottage Grove · 42,760 people · 2019 | 1/1 | SYR4 |
| Chromium | 0.3225 µg/L 0.3% of the EPA limit 100 µg/L Main supplier: Cottage Grove · 42,760 people · 2018 | 1/1 | SYR4 |
| Pfba | 0.2200 µg/L No EPA limit set Main supplier: Cottage Grove · 42,760 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0064 µg/L No EPA limit set Main supplier: Cottage Grove · 42,760 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: Cottage Grove · 42,760 people · 2025 | 1/1 | LCR |
Water suppliers serving Cottage Grove
| Supplier | Population served |
|---|---|
| Cottage Grove | 42,760 |
Frequently asked questions about Cottage Grove tap water
Is Cottage Grove tap water safe to drink?
EPA testing detected 19 contaminants in the water serving Cottage Grove. 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 Cottage Grove?
1 public water supplier report drinking-water monitoring for Cottage Grove, Minnesota to the EPA. Each is listed above with its population served.
What contaminants are in Cottage Grove's water?
The contaminants EPA monitoring detected in Cottage Grove include Nitrate-Nitrite, Fluoride, Copper, Gross Alpha, Excl. Radon And U, Lead. 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.