What was found in Hummelstown'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 | 4150 µg/L 42% of the EPA limit 10000 µg/L Main supplier: PA AMER WATER CO · 50,200 people · 2019 | 2/2 | SYR4 |
| Fluoride | 1009.9999999999999 µg/L 25% of the EPA limit 4000 µg/L Main supplier: PA AMER WATER CO · 50,200 people · 2019 | 1/2 | SYR4 |
| Copper | 281.0999999999999 µg/L 22% of the EPA limit 1300 µg/L Main supplier: PA AMER WATER CO · 50,200 people · 2019 | 2/2 | SYR4 |
| TTHM | 88.98 µg/L 111% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: PA AMER WATER CO · 50,200 people · 2019
Highest in the city: 120.99999999999999 µg/L — PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29.040000000000003 µg/L 48% of the EPA limit 60 µg/L Main supplier: PA AMER WATER CO · 50,200 people · 2019
Highest in the city: 112 µg/L — PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 2/2 | SYR4 |
| Chloroform | 71.46000000000001 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2019
Highest in the city: 104.5 µg/L — PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 11.425 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2019
Highest in the city: 48.87 µg/L — PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 8.51 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2019
Highest in the city: 32.06999999999999 µg/L — PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 2/2 | SYR4 |
| Barium | 26.95 µg/L 1.3% of the EPA limit 2000 µg/L Highest in the city: PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 14 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2019
Highest in the city: 20.825 µg/L — PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 2/2 | SYR4 |
| Lead | 5.699999999999996 µg/L 38% of the EPA limit 15 µg/L Main supplier: PA AMER WATER CO · 50,200 people · 2019
Highest in the city: 13.604999999999993 µg/L — PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 2/2 | SYR4 |
| Lithium | 11.4 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2024 | 1/2 | UCMR-5 |
| Monochloroacetic Acid | 8.61 µg/L No EPA limit set Highest in the city: PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 3.7400000000000007 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2019
Highest in the city: 7.369999999999996 µg/L — PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 2/2 | SYR4 |
| Selenium | 6.9 µg/L 14% of the EPA limit 50 µg/L Highest in the city: PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 4.29 µg/L No EPA limit set Highest in the city: PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 1/2 | SYR4 |
| Cyanide | 4.1 µg/L 2.1% of the EPA limit 200 µg/L Highest in the city: PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 1/2 | SYR4 |
| Dalapon | 2.4 µg/L 1.2% of the EPA limit 200 µg/L Main supplier: PA AMER WATER CO · 50,200 people · 2019 | 1/2 | SYR4 |
| Bromoform | 1.1009999999999998 µg/L No EPA limit set Highest in the city: PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1 µg/L No EPA limit set Highest in the city: PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 1/2 | SYR4 |
| Hexachlorocyclopentadiene | 0.2200 µg/L 0.4% of the EPA limit 50 µg/L Highest in the city: PA AMERICAN WATER STEELTON · 6,428 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.2000 µg/L 6.7% of the EPA limit 3 µg/L Main supplier: PA AMER WATER CO · 50,200 people · 2019 | 1/2 | SYR4 |
| Pfpea | 0.0069 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2024 | 1/2 | UCMR-5 |
| Pfba | 0.0067 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0057 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2024 | 1/2 | UCMR-5 |
| PFOA | 0.0043 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2024 | 1/2 | UCMR-5 |
| PFBS | 0.0039 µg/L No EPA limit set Main supplier: PA AMER WATER CO · 50,200 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Main supplier: PA AMER WATER CO · 50,200 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 Hummelstown
| Supplier | Population served |
|---|---|
| PA AMER WATER CO | 50,200 |
| PA AMERICAN WATER STEELTON | 6,428 |
Frequently asked questions about Hummelstown tap water
Is Hummelstown tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Hummelstown. 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 Hummelstown?
2 public water suppliers report drinking-water monitoring for Hummelstown, Pennsylvania to the EPA. Each is listed above with its population served.
What contaminants are in Hummelstown's water?
The contaminants EPA monitoring detected in Hummelstown include Nitrate, Fluoride, Copper, TTHM, Total Haloacetic Acids (HAA5). 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.