What was found in Columbia'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 | 30 µg/L 0.3% of the EPA limit 10000 µg/L Main supplier: HILLSIDE CONDOMINIUMS · 96 people · 2019
Highest in the city: 1500 µg/L — DARTMOUTH VILLAGE ELDERLY HOUSING · 25 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 30 µg/L 0.3% of the EPA limit 10000 µg/L Main supplier: HILLSIDE CONDOMINIUMS · 96 people · 2019
Highest in the city: 1460 µg/L — DARTMOUTH VILLAGE ELDERLY HOUSING · 25 people · 2019 | 4/4 | SYR4 |
| Fluoride | 673.5 µg/L 17% of the EPA limit 4000 µg/L Main supplier: HILLSIDE CONDOMINIUMS · 96 people · 2017
Highest in the city: 799 µg/L — DARTMOUTH VILLAGE ELDERLY HOUSING · 25 people · 2018 | 4/4 | SYR4 |
| Copper | 242.4 µg/L 19% of the EPA limit 1300 µg/L Main supplier: HILLSIDE CONDOMINIUMS · 96 people · 2018
Highest in the city: 464 µg/L — CTWC - COLUMBIA HEIGHTS DIV. · 32 people · 2019 | 4/4 | SYR4 |
| Lead | 8.01 µg/L 53% of the EPA limit 15 µg/L Main supplier: HILLSIDE CONDOMINIUMS · 96 people · 2018
Highest in the city: 21.2 µg/L — CTWC - COLUMBIA HEIGHTS DIV. · 32 people · 2019 | 4/4 | SYR4 |
| Combined Uranium | 3.305 µg/L 11% of the EPA limit 30 µg/L Main supplier: HILLSIDE CONDOMINIUMS · 96 people · 2019
Highest in the city: 10.48 µg/L — DARTMOUTH VILLAGE ELDERLY HOUSING · 25 people · 2019 | 3/4 | SYR4 |
| Barium | 9.8 µg/L 0.5% of the EPA limit 2000 µg/L Highest in the city: WOODLAND TERRACE · 27 people · 2019 | 3/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.1 pCi/L 7.3% of the EPA limit 15 pCi/L Main supplier: HILLSIDE CONDOMINIUMS · 96 people · 2019
Highest in the city: 4.4735 pCi/L — CTWC - COLUMBIA HEIGHTS DIV. · 32 people · 2015 | 3/4 | SYR4 |
| Combined Radium (-226 And -228) | 3.4 pCi/L 68% of the EPA limit 5 pCi/L Highest in the city: CTWC - COLUMBIA HEIGHTS DIV. · 32 people · 2015 | 1/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.86 µg/L 31% of the EPA limit 6 µg/L Highest in the city: DARTMOUTH VILLAGE ELDERLY HOUSING · 25 people · 2019 | 2/4 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Highest in the city: CTWC - COLUMBIA HEIGHTS DIV. · 32 people · 2019 | 2/4 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: HILLSIDE CONDOMINIUMS · 96 people · 2024
Highest in the city: 0.0084 mg/L — WOODLAND TERRACE · 27 people · 2027 | 4/4 | LCR |
Water suppliers serving Columbia
| Supplier | Population served |
|---|---|
| HILLSIDE CONDOMINIUMS | 96 |
| CTWC - COLUMBIA HEIGHTS DIV. | 32 |
| WOODLAND TERRACE | 27 |
| DARTMOUTH VILLAGE ELDERLY HOUSING | 25 |
Frequently asked questions about Columbia tap water
Is Columbia tap water safe to drink?
EPA testing detected 12 contaminants in the water serving Columbia. 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 Columbia?
4 public water suppliers report drinking-water monitoring for Columbia, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Columbia's water?
The contaminants EPA monitoring detected in Columbia include Nitrate, Nitrate-Nitrite, Fluoride, Copper, 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.