What was found in Berthoud'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 |
|---|---|---|---|
| Fluoride | 689.4999999999999 µg/L 17% of the EPA limit 4000 µg/L Highest in the city: CARTER LAKE FILTER PLANT · 11 people · 2019 | 2/5 | SYR4 |
| Chlorite | 340 µg/L 34% of the EPA limit 1000 µg/L Highest in the city: CARTER LAKE FILTER PLANT · 11 people · 2019 | 1/5 | SYR4 |
| Nitrate | 78 µg/L 0.8% of the EPA limit 10000 µg/L Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2019 | 2/5 | SYR4 |
| Total Haloacetic Acids (HAA5) | 49.61999999999998 µg/L 83% of the EPA limit 60 µg/L Main supplier: LITTLE THOMPSON WD · 25,654 people · 2019
Highest in the city: 76.02999999999999 µg/L — CARTER LAKE FILTER PLANT · 11 people · 2012 | 5/5 | SYR4 |
| TTHM | 62.1035 µg/L 78% of the EPA limit 80 µg/L Main supplier: LITTLE THOMPSON WD · 25,654 people · 2019
Highest in the city: 67.50999999999998 µg/L — BERTHOUD TOWN OF · 14,211 people · 2019 | 5/5 | SYR4 |
| Nitrate-Nitrite | 64 µg/L 0.6% of the EPA limit 10000 µg/L Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2018 | 1/5 | SYR4 |
| Chloroform | 48.645 µg/L No EPA limit set Main supplier: LITTLE THOMPSON WD · 25,654 people · 2019
Highest in the city: 49.9 µg/L — BERTHOUD TOWN OF · 14,211 people · 2019 | 4/5 | SYR4 |
| Trichloroacetic Acid | 21.925 µg/L No EPA limit set Main supplier: LITTLE THOMPSON WD · 25,654 people · 2019 | 4/5 | SYR4 |
| Bromodichloromethane | 5.1 µg/L No EPA limit set Main supplier: LITTLE THOMPSON WD · 25,654 people · 2019
Highest in the city: 18.7 µg/L — BERTHOUD TOWN OF · 14,211 people · 2019 | 4/5 | SYR4 |
| Barium | 18.65 µg/L 0.9% of the EPA limit 2000 µg/L Highest in the city: CARTER LAKE FILTER PLANT · 11 people · 2019 | 2/5 | SYR4 |
| Dichloroacetic Acid | 17.635 µg/L No EPA limit set Main supplier: LITTLE THOMPSON WD · 25,654 people · 2019
Highest in the city: 18.15099999999999 µg/L — BERTHOUD TOWN OF · 14,211 people · 2019 | 4/5 | SYR4 |
| Lithium | 12.3 µg/L No EPA limit set Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2023 | 1/5 | UCMR-5 |
| Dibromochloromethane | 0.6000 µg/L No EPA limit set Main supplier: LITTLE THOMPSON WD · 25,654 people · 2019
Highest in the city: 7.749999999999999 µg/L — BERTHOUD TOWN OF · 14,211 people · 2019 | 2/5 | SYR4 |
| Monobromoacetic Acid | 3.5195 µg/L No EPA limit set Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2019 | 1/5 | SYR4 |
| Monochloroacetic Acid | 3 µg/L No EPA limit set Main supplier: LITTLE THOMPSON WD · 25,654 people · 2019 | 4/5 | SYR4 |
| Combined Uranium | 2.895 µg/L 9.7% of the EPA limit 30 µg/L Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2019 | 1/5 | SYR4 |
| Dibromoacetic Acid | 1.9099999999999997 µg/L No EPA limit set Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2019 | 1/5 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.8 pCi/L 12% of the EPA limit 15 pCi/L Highest in the city: CARTER LAKE FILTER PLANT · 11 people · 2019 | 2/5 | SYR4 |
| Thallium, Total | 1.7 µg/L 85% of the EPA limit 2 µg/L Highest in the city: CARTER LAKE FILTER PLANT · 11 people · 2019 | 1/5 | SYR4 |
| Combined Radium (-226 And -228) | 1.5149999999999997 pCi/L 30% of the EPA limit 5 pCi/L Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2019 | 2/5 | SYR4 |
| Bromoform | 1.1599999999999997 µg/L No EPA limit set Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2019 | 1/5 | SYR4 |
| Mercury | 0.7000 µg/L 35% of the EPA limit 2 µg/L Highest in the city: BERTHOUD TOWN OF · 14,211 people · 2019 | 1/5 | SYR4 |
| Lead | 0.0090 mg/L 60% of the EPA limit 0.0150 mg/L Main supplier: LITTLE THOMPSON WD · 25,654 people · 1996
Highest in the city: 0.0100 mg/L — BERTHOUD TOWN OF · 14,211 people · 2025 | 5/5 | LCR |
| PFOA | 0.0048 µg/L No EPA limit set Main supplier: LITTLE THOMPSON WD · 25,654 people · 2024 | 1/5 | 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.
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 Berthoud
| Supplier | Population served |
|---|---|
| LITTLE THOMPSON WD | 25,654 |
| BERTHOUD TOWN OF | 14,211 |
| NORTH CARTER LAKE WD | 328 |
| SERENITY RIDGE VAULT CONNECTION | 157 |
| CARTER LAKE FILTER PLANT | 11 |
Frequently asked questions about Berthoud tap water
Is Berthoud tap water safe to drink?
EPA testing detected 24 contaminants in the water serving Berthoud. 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 Berthoud?
5 public water suppliers report drinking-water monitoring for Berthoud, Colorado to the EPA. Each is listed above with its population served.
What contaminants are in Berthoud's water?
The contaminants EPA monitoring detected in Berthoud include Fluoride, Chlorite, Nitrate, Total Haloacetic Acids (HAA5), 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.