What was found in Granby'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 | 3645.5 µg/L 36% of the EPA limit 10000 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019
Highest in the city: 4000 µg/L — SALMON BROOK DISTRICT WATER DEPT · 2,151 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 3624.5 µg/L 36% of the EPA limit 10000 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019
Highest in the city: 4000 µg/L — SALMON BROOK DISTRICT WATER DEPT · 2,151 people · 2019 | 2/2 | SYR4 |
| Copper | 848.5 µg/L 65% of the EPA limit 1300 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 2/2 | SYR4 |
| Barium | 136.9 µg/L 6.8% of the EPA limit 2000 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2017 | 2/2 | SYR4 |
| Fluoride | 88 µg/L 2.2% of the EPA limit 4000 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2017 | 1/2 | SYR4 |
| Lithium | 15.1 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2025 | 1/2 | UCMR-5 |
| TTHM | 9.7 µg/L 12% of the EPA limit 80 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Lead | 8 µg/L 53% of the EPA limit 15 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 2/2 | SYR4 |
| Antimony, Total | 6 µg/L 100% of the EPA limit 6 µg/L Highest in the city: SALMON BROOK DISTRICT WATER DEPT · 2,151 people · 2017 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.65 pCi/L 31% of the EPA limit 15 pCi/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 3.32 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Chloroform | 3.085 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 3 µg/L 5% of the EPA limit 60 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 2.6 pCi/L 52% of the EPA limit 5 pCi/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 2.5 µg/L 8.3% of the EPA limit 30 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 2.4 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Tetrachloroethylene | 2.4 µg/L 48% of the EPA limit 5 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Bromoform | 1 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Cadmium | 1 µg/L 20% of the EPA limit 5 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2017 | 1/2 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2017 | 1/2 | SYR4 |
| Dibromoacetic Acid | 1 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 1 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 1 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| 1,2-Dichloropropane | 0.9600 µg/L 19% of the EPA limit 5 µg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2019 | 1/2 | SYR4 |
| Adona | 0.0081 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2025 | 1/2 | UCMR-5 |
| PFOA | 0.0044 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2025 | 1/2 | UCMR-5 |
| PFOS | 0.0043 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0037 µg/L No EPA limit set Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.00030 mg/L 2% of the EPA limit 0.0150 mg/L Main supplier: AQUARION-SIMSBURY REGIONAL · 14,691 people · 2025 | 2/2 | LCR |
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 Granby
| Supplier | Population served |
|---|---|
| AQUARION-SIMSBURY REGIONAL | 14,691 |
| SALMON BROOK DISTRICT WATER DEPT | 2,151 |
Frequently asked questions about Granby tap water
Is Granby tap water safe to drink?
EPA testing detected 29 contaminants in the water serving Granby. 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 Granby?
2 public water suppliers report drinking-water monitoring for Granby, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Granby's water?
The contaminants EPA monitoring detected in Granby include Nitrate, Nitrate-Nitrite, Copper, Barium, Fluoride. 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.