What was found in ZIP 80504
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 670 µg/L 17% of the EPA limit 4000 µg/L Main supplier: LONGMONT CITY OF · 104,178 people · 2018
Highest in the ZIP: 934.5 µg/L — LEFT HAND WD · 20,280 people · 2019 | 2/6 | SYR4 |
| Nitrate | 110 µg/L 1.1% of the EPA limit 10000 µg/L Main supplier: LONGMONT CITY OF · 104,178 people · 2019
Highest in the ZIP: 240 µg/L — LEFT HAND WD · 20,280 people · 2019 | 2/6 | SYR4 |
| Nitrate-Nitrite | 88.652 µg/L 0.9% of the EPA limit 10000 µg/L Main supplier: LONGMONT CITY OF · 104,178 people · 2014 | 2/6 | SYR4 |
| TTHM | 41.45 µg/L 52% of the EPA limit 80 µg/L Main supplier: LONGMONT CITY OF · 104,178 people · 2019
Highest in the ZIP: 87.53 µg/L — LEFT HAND WD · 20,280 people · 2019 | 6/6 | SYR4 |
| Chloroform | 35.94 µg/L No EPA limit set Main supplier: LONGMONT CITY OF · 104,178 people · 2018
Highest in the ZIP: 71.11 µg/L — LEFT HAND WD · 20,280 people · 2019 | 6/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 28.975 µg/L 48% of the EPA limit 60 µg/L Main supplier: LONGMONT CITY OF · 104,178 people · 2019
Highest in the ZIP: 53 µg/L — FREDERICK TOWN OF · 17,173 people · 2019 | 6/6 | SYR4 |
| Barium | 10.4 µg/L 0.5% of the EPA limit 2000 µg/L Main supplier: LONGMONT CITY OF · 104,178 people · 2012
Highest in the ZIP: 50.25 µg/L — LEFT HAND WD · 20,280 people · 2019 | 2/6 | SYR4 |
| Dichloroacetic Acid | 9.4035 µg/L No EPA limit set Main supplier: LONGMONT CITY OF · 104,178 people · 2018
Highest in the ZIP: 24.265 µg/L — FREDERICK TOWN OF · 17,173 people · 2019 | 6/6 | SYR4 |
| Trichloroacetic Acid | 12.525 µg/L No EPA limit set Main supplier: LONGMONT CITY OF · 104,178 people · 2018
Highest in the ZIP: 22.65 µg/L — CENTRAL WELD CNTY WD · 7,662 people · 2019 | 6/6 | SYR4 |
| Bromodichloromethane | 2.714 µg/L No EPA limit set Main supplier: LONGMONT CITY OF · 104,178 people · 2018
Highest in the ZIP: 12.51 µg/L — LEFT HAND WD · 20,280 people · 2019 | 6/6 | SYR4 |
| Nitrite | 8.11 µg/L 0.8% of the EPA limit 1000 µg/L Highest in the ZIP: LEFT HAND WD · 20,280 people · 2013 | 1/6 | SYR4 |
| Monochloroacetic Acid | 5.607 µg/L No EPA limit set Highest in the ZIP: FREDERICK TOWN OF · 17,173 people · 2019 | 5/6 | SYR4 |
| Xylenes, Total | 4.965 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: LEFT HAND WD · 20,280 people · 2019 | 1/6 | SYR4 |
| Monobromoacetic Acid | 2.932 µg/L No EPA limit set Highest in the ZIP: FIRESTONE TOWN OF · 27,798 people · 2019 | 1/6 | SYR4 |
| Dibromochloromethane | 2.61 µg/L No EPA limit set Highest in the ZIP: LEFT HAND WD · 20,280 people · 2019 | 4/6 | SYR4 |
| Bromoform | 1.6725 µg/L No EPA limit set Highest in the ZIP: FIRESTONE TOWN OF · 27,798 people · 2019 | 2/6 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.456 µg/L 24% of the EPA limit 6 µg/L Main supplier: LONGMONT CITY OF · 104,178 people · 2019 | 1/6 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.6000 pCi/L 4% of the EPA limit 15 pCi/L Main supplier: LONGMONT CITY OF · 104,178 people · 2012
Highest in the ZIP: 1.285 pCi/L — LEFT HAND WD · 20,280 people · 2012 | 2/6 | SYR4 |
| Selenium | 1.1 µg/L 2.2% of the EPA limit 50 µg/L Highest in the ZIP: LEFT HAND WD · 20,280 people · 2019 | 1/6 | SYR4 |
| Ethylbenzene | 0.6100 µg/L 0.1% of the EPA limit 700 µg/L Highest in the ZIP: LEFT HAND WD · 20,280 people · 2019 | 1/6 | SYR4 |
| Combined Radium (-226 And -228) | 0.2000 pCi/L 4% of the EPA limit 5 pCi/L Main supplier: LONGMONT CITY OF · 104,178 people · 2012 | 2/6 | SYR4 |
| Hexachlorocyclopentadiene | 0.1064 µg/L 0.2% of the EPA limit 50 µg/L Highest in the ZIP: LEFT HAND WD · 20,280 people · 2017 | 1/6 | SYR4 |
| Hexachlorobenzene | 0.0150 µg/L 1.5% of the EPA limit 1 µg/L Highest in the ZIP: LEFT HAND WD · 20,280 people · 2019 | 1/6 | SYR4 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: LONGMONT CITY OF · 104,178 people · 2025
Highest in the ZIP: 0.0090 mg/L — LITTLE THOMPSON WD · 25,654 people · 1996 | 6/6 | LCR |
| PFOA | 0.0048 µg/L No EPA limit set Highest in the ZIP: LITTLE THOMPSON WD · 25,654 people · 2024 | 1/6 | UCMR-5 |
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.
Water suppliers serving ZIP 80504
| Supplier | State | Population served |
|---|---|---|
| LONGMONT CITY OF | CO | 104,178 |
| FIRESTONE TOWN OF | CO | 27,798 |
| LITTLE THOMPSON WD | CO | 25,654 |
| LEFT HAND WD | CO | 20,280 |
| FREDERICK TOWN OF | CO | 17,173 |
| CENTRAL WELD CNTY WD | CO | 7,662 |
Frequently asked questions about ZIP 80504 tap water
Is the tap water in ZIP 80504 safe to drink?
EPA testing detected 25 contaminants across the water suppliers serving ZIP 80504. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 80504?
6 public water suppliers report EPA drinking-water monitoring for ZIP 80504. Each is listed above with its population served.
What contaminants are in ZIP 80504's water?
EPA monitoring detected Fluoride, Nitrate, Nitrate-Nitrite, TTHM, Chloroform, and others across this ZIP's suppliers. The full list with levels and sources is above.