What was found in Lake Barrington'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 | 1137 µg/L 28% of the EPA limit 4000 µg/L Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2018 | 2/2 | SYR4 |
| Copper | 234.7 µg/L 18% of the EPA limit 1300 µg/L Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2018
Highest in the city: 545 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Nitrate | 400 µg/L 4% of the EPA limit 10000 µg/L Highest in the city: LAKE BARRINGTON · 500 people · 2019 | 1/2 | SYR4 |
| Barium | 36.9 µg/L 1.8% of the EPA limit 2000 µg/L Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2018
Highest in the city: 168.85 µg/L — LAKE BARRINGTON · 500 people · 2017 | 2/2 | SYR4 |
| Lead | 21.05 µg/L 140% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2018
Highest in the city: 42.75 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| TTHM | 15.853 µg/L 20% of the EPA limit 80 µg/L Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019
Highest in the city: 27.981 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 8.4355 µg/L 14% of the EPA limit 60 µg/L Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019
Highest in the city: 10.7635 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 3.694 µg/L No EPA limit set Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019
Highest in the city: 10.425 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 5.273 µg/L No EPA limit set Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019
Highest in the city: 9.352 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Chloroform | 6.914 µg/L No EPA limit set Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 6.85 µg/L No EPA limit set Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019 | 2/2 | SYR4 |
| Bromoform | 0.7130 µg/L No EPA limit set Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019
Highest in the city: 4.9485 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 1.89 µg/L No EPA limit set Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019
Highest in the city: 4.6445 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 2.11 µg/L No EPA limit set Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019
Highest in the city: 4.5245 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 1.81 µg/L No EPA limit set Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2019
Highest in the city: 2.2365 µg/L — LAKE BARRINGTON · 500 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 2.135 pCi/L 43% of the EPA limit 5 pCi/L Highest in the city: LAKE BARRINGTON · 500 people · 2018 | 1/2 | SYR4 |
| Monochloroacetic Acid | 1.34 µg/L No EPA limit set Highest in the city: LAKE BARRINGTON · 500 people · 2019 | 1/2 | SYR4 |
| Lead | 0.0067 mg/L 45% of the EPA limit 0.0150 mg/L Main supplier: LAKE BARRINGTON SHORES SUBDIVSION · 2,300 people · 2024
Highest in the city: 0.0150 mg/L — LAKE BARRINGTON · 500 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 Lake Barrington
| Supplier | Population served |
|---|---|
| LAKE BARRINGTON SHORES SUBDIVSION | 2,300 |
| LAKE BARRINGTON | 500 |
Frequently asked questions about Lake Barrington tap water
Is Lake Barrington tap water safe to drink?
EPA testing detected 18 contaminants in the water serving Lake Barrington. 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 Lake Barrington?
2 public water suppliers report drinking-water monitoring for Lake Barrington, Illinois to the EPA. Each is listed above with its population served.
What contaminants are in Lake Barrington's water?
The contaminants EPA monitoring detected in Lake Barrington include Fluoride, Copper, Nitrate, Barium, Lead. 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.