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 | 655 µg/L 6.6% of the EPA limit 10000 µg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019
Highest in the city: 5200 µg/L — MORAINE PARK WS · 100 people · 2019 | 4/5 | SYR4 |
| Fluoride | 1046 µg/L 26% of the EPA limit 4000 µg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019 | 3/5 | SYR4 |
| Nitrate-Nitrite | 260 µg/L 2.6% of the EPA limit 10000 µg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2012
Highest in the city: 890 µg/L — MORAINE PARK WS · 100 people · 2012 | 3/5 | SYR4 |
| TTHM | 34.15 µg/L 43% of the EPA limit 80 µg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019
Highest in the city: 82.08 µg/L — GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2019 | 4/5 | SYR4 |
| Chloroform | 16 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019
Highest in the city: 75.8 µg/L — GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2019 | 4/5 | SYR4 |
| Barium | 51 µg/L 2.6% of the EPA limit 2000 µg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019
Highest in the city: 54 µg/L — MORAINE PARK WS · 100 people · 2019 | 4/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 17.897 µg/L 30% of the EPA limit 60 µg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019
Highest in the city: 38.815 µg/L — GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2019 | 4/5 | SYR4 |
| Trichloroacetic Acid | 5.975 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019
Highest in the city: 26.617 µg/L — GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2019 | 2/5 | SYR4 |
| Dichloroacetic Acid | 8.655 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019
Highest in the city: 13.88 µg/L — GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2019 | 3/5 | SYR4 |
| Bromodichloromethane | 9.7 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019 | 4/5 | SYR4 |
| Dibromochloromethane | 7 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019 | 4/5 | SYR4 |
| Combined Uranium | 6.4 µg/L 21% of the EPA limit 30 µg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2015 | 2/5 | SYR4 |
| Combined Radium (-226 And -228) | 0.8000 pCi/L 16% of the EPA limit 5 pCi/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2012
Highest in the city: 4.2 pCi/L — GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2019 | 3/5 | SYR4 |
| Monobromoacetic Acid | 4.135 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019 | 1/5 | SYR4 |
| Selenium | 4 µg/L 8% of the EPA limit 50 µg/L Highest in the city: GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2019 | 3/5 | SYR4 |
| Dibromoacetic Acid | 2.55 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019 | 2/5 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019
Highest in the city: 2 µg/L — GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2019 | 3/5 | SYR4 |
| Arsenic | 1.9 µg/L 19% of the EPA limit 10 µg/L Highest in the city: YMCA SNOW MTN RANCH · 578 people · 2019 | 1/5 | SYR4 |
| Monochloroacetic Acid | 1.78 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019 | 3/5 | SYR4 |
| Bromoform | 1.71 µg/L No EPA limit set Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2019 | 3/5 | SYR4 |
| Antimony, Total | 1.3 µg/L 22% of the EPA limit 6 µg/L Highest in the city: YMCA SNOW MTN RANCH · 578 people · 2019 | 1/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.7120 pCi/L 4.7% of the EPA limit 15 pCi/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2015 | 2/5 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: GRANBY TOWN OF SOUTH SERVICE AREA · 2,300 people · 2023
Highest in the city: 0.0080 mg/L — GRANBY TOWN OF NORTH SERVICE AREA · 2,025 people · 2025 | 4/5 | 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 |
|---|---|
| GRANBY TOWN OF SOUTH SERVICE AREA | 2,300 |
| GRANBY TOWN OF NORTH SERVICE AREA | 2,025 |
| YMCA SNOW MTN RANCH | 578 |
| MORAINE PARK WS | 100 |
| GRANBY TOWN OF WEST SERVICE AREA | 0 |
Frequently asked questions about Granby tap water
Is Granby tap water safe to drink?
EPA testing detected 23 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?
5 public water suppliers report drinking-water monitoring for Granby, Colorado 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, Fluoride, Nitrate-Nitrite, TTHM, Chloroform. 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.