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 | 2800 µg/L 28% of the EPA limit 10000 µg/L Highest in the city: MCKENZIE PALISADES WATER BOARD · 50 people · 2019 | 6/8 | SYR4 |
| Nitrate-Nitrite | 2450 µg/L 25% of the EPA limit 10000 µg/L Highest in the city: MCKENZIE PALISADES WATER BOARD · 50 people · 2019 | 5/8 | SYR4 |
| Copper | 75 µg/L 5.8% of the EPA limit 1300 µg/L Main supplier: COTTAGE GROVE, CITY OF · 10,879 people · 2018
Highest in the city: 1702 µg/L — LAMONTAI IMPROVEMENT WTR DIST · 255 people · 2017 | 5/8 | SYR4 |
| Total Haloacetic Acids (HAA5) | 23.2 µg/L 39% of the EPA limit 60 µg/L Main supplier: COTTAGE GROVE, CITY OF · 10,879 people · 2019
Highest in the city: 180.25 µg/L — SWISSHOME VILLAGE · 24 people · 2019 | 3/8 | SYR4 |
| TTHM | 42.53 µg/L 53% of the EPA limit 80 µg/L Main supplier: COTTAGE GROVE, CITY OF · 10,879 people · 2019
Highest in the city: 132.5 µg/L — SWISSHOME VILLAGE · 24 people · 2019 | 4/8 | SYR4 |
| Fluoride | 123 µg/L 3.1% of the EPA limit 4000 µg/L Highest in the city: HILLTOP IMPROVEMENT DISTRICT · 45 people · 2019 | 1/8 | SYR4 |
| Barium | 28.3 µg/L 1.4% of the EPA limit 2000 µg/L Highest in the city: HILLTOP IMPROVEMENT DISTRICT · 45 people · 2019 | 3/8 | SYR4 |
| Lead | 26.55 µg/L 177% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: COTTAGE GROVE, CITY OF · 10,879 people · 2018 | 5/8 | SYR4 |
| Arsenic | 22.815 µg/L 228% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the city: HILLTOP IMPROVEMENT DISTRICT · 45 people · 2019 | 3/8 | SYR4 |
| Gross Alpha, Excl. Radon And U | 8.86 pCi/L 59% of the EPA limit 15 pCi/L Main supplier: COTTAGE GROVE, CITY OF · 10,879 people · 2018 | 1/8 | SYR4 |
| Antimony, Total | 0.5420 µg/L 9% of the EPA limit 6 µg/L Highest in the city: MCKENZIE PALISADES WATER BOARD · 50 people · 2019 | 1/8 | SYR4 |
| Lead | 0.0080 mg/L 53% of the EPA limit 0.0150 mg/L Main supplier: COTTAGE GROVE, CITY OF · 10,879 people · 2024
Highest in the city: 0.0325 mg/L — MCKENZIE PALISADES WATER BOARD · 50 people · 2026 | 8/8 | LCR |
Water suppliers serving Cottage Grove
| Supplier | Population served |
|---|---|
| COTTAGE GROVE, CITY OF | 10,879 |
| LAMONTAI IMPROVEMENT WTR DIST | 255 |
| RIVERSTONE MOBILE HOME PARK | 168 |
| LONDON WATER CO-OP | 63 |
| MCKENZIE PALISADES WATER BOARD | 50 |
| HILLTOP IMPROVEMENT DISTRICT | 45 |
| MINT ACRES WATER CO-OP | 35 |
| SWISSHOME VILLAGE | 24 |
Frequently asked questions about Cottage Grove tap water
Is Cottage Grove tap water safe to drink?
EPA testing detected 12 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?
8 public water suppliers report drinking-water monitoring for Cottage Grove, Oregon 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, Nitrate-Nitrite, Copper, Total Haloacetic Acids (HAA5), 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.