What was found in Lafayette'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 | 76 µg/L 0.8% of the EPA limit 10000 µg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 1900 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 4/7 | SYR4 |
| Fluoride | 1014.5 µg/L 25% of the EPA limit 4000 µg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 1085 µg/L — LARK MEADOWS WA · 75 people · 2019 | 4/7 | SYR4 |
| Nitrate-Nitrite | 75.5 µg/L 0.8% of the EPA limit 10000 µg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2013
Highest in the city: 1000 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2013 | 4/7 | SYR4 |
| Barium | 49.25 µg/L 2.5% of the EPA limit 2000 µg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 143.25 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 4/7 | SYR4 |
| TTHM | 85.555 µg/L 107% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019 | 4/7 | SYR4 |
| Chloroform | 45.54 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019 | 4/7 | SYR4 |
| Total Haloacetic Acids (HAA5) | 32.915 µg/L 55% of the EPA limit 60 µg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019 | 4/7 | SYR4 |
| Nitrite | 22 µg/L 2.2% of the EPA limit 1000 µg/L Highest in the city: MAPLE GROVE WD · 35 people · 2012 | 2/7 | SYR4 |
| Bromodichloromethane | 20.82 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019 | 4/7 | SYR4 |
| Dichloroacetic Acid | 15.414 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019 | 2/7 | SYR4 |
| Dibromochloromethane | 9.08 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 14.465 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 4/7 | SYR4 |
| Trichloroacetic Acid | 8.7285 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019 | 2/7 | SYR4 |
| Selenium | 0.9900 µg/L 2% of the EPA limit 50 µg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 7.8 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 2/7 | SYR4 |
| Bromoform | 1.3 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 5.92 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 4/7 | SYR4 |
| Dibromoacetic Acid | 2.87 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 4.81 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 3/7 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.065 pCi/L 20% of the EPA limit 15 pCi/L Highest in the city: LARK MEADOWS WA · 75 people · 2014 | 1/7 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 2.95 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 3/7 | SYR4 |
| Antimony, Total | 2.9 µg/L 48% of the EPA limit 6 µg/L Highest in the city: SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 1/7 | SYR4 |
| Combined Uranium | 2.495 µg/L 8.3% of the EPA limit 30 µg/L Highest in the city: LARK MEADOWS WA · 75 people · 2019 | 2/7 | SYR4 |
| Monobromoacetic Acid | 1.3 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019
Highest in the city: 2.25 µg/L — SAN LAZARO MFCTD HOUSING COMMUNITY · 844 people · 2019 | 2/7 | SYR4 |
| Monochloroacetic Acid | 2.085 µg/L No EPA limit set Main supplier: LAFAYETTE CITY OF · 28,700 people · 2019 | 3/7 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Highest in the city: MAPLE GROVE WD · 35 people · 2018 | 2/7 | SYR4 |
| Combined Radium (-226 And -228) | 0.6000 pCi/L 12% of the EPA limit 5 pCi/L Highest in the city: LARK MEADOWS WA · 75 people · 2012 | 3/7 | SYR4 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L Main supplier: LAFAYETTE CITY OF · 28,700 people · 2025
Highest in the city: 0.0100 mg/L — LARK MEADOWS WA · 75 people · 2025 | 7/7 | 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 Lafayette
| Supplier | Population served |
|---|---|
| LAFAYETTE CITY OF | 28,700 |
| ARBORDALE ACRES MHP | 901 |
| BOULDER RIDGE MHP | 897 |
| SAN LAZARO MFCTD HOUSING COMMUNITY | 844 |
| SKYLARK MOBILE HOME COMMUNITY | 342 |
| LARK MEADOWS WA | 75 |
| MAPLE GROVE WD | 35 |
Frequently asked questions about Lafayette tap water
Is Lafayette tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Lafayette. 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 Lafayette?
7 public water suppliers report drinking-water monitoring for Lafayette, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Lafayette's water?
The contaminants EPA monitoring detected in Lafayette include Nitrate, Fluoride, Nitrate-Nitrite, Barium, 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.