What was found in Williamsport'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 | 5910 µg/L 59% of the EPA limit 10000 µg/L Highest in the city: CEDAR RIDGE CHILDREN'S HOME & SCHOOL · 45 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 5910 µg/L 59% of the EPA limit 10000 µg/L Highest in the city: CEDAR RIDGE CHILDREN'S HOME & SCHOOL · 45 people · 2019 | 3/4 | SYR4 |
| Fluoride | 1295 µg/L 32% of the EPA limit 4000 µg/L Highest in the city: TOWN OF SHARPSBURG · 1,360 people · 2019 | 3/4 | SYR4 |
| TTHM | 66.028 µg/L 83% of the EPA limit 80 µg/L Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2019
Highest in the city: 142.55 µg/L — TOWN OF SHARPSBURG · 1,360 people · 2019 | 4/4 | SYR4 |
| Chloroform | 38.791 µg/L No EPA limit set Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2015
Highest in the city: 92.363 µg/L — TOWN OF SHARPSBURG · 1,360 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 32.12 µg/L 54% of the EPA limit 60 µg/L Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2019
Highest in the city: 50.634 µg/L — TOWN OF SHARPSBURG · 1,360 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 25.54 µg/L No EPA limit set Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2015
Highest in the city: 37.9 µg/L — TOWN OF SHARPSBURG · 1,360 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 20.245 µg/L No EPA limit set Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2015
Highest in the city: 29.53 µg/L — TOWN OF SHARPSBURG · 1,360 people · 2015 | 4/4 | SYR4 |
| Trichloroacetic Acid | 10.424 µg/L No EPA limit set Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2015
Highest in the city: 28.68 µg/L — TOWN OF SHARPSBURG · 1,360 people · 2015 | 4/4 | SYR4 |
| Dibromochloromethane | 16.72 µg/L No EPA limit set Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2015
Highest in the city: 23.267 µg/L — TOWN OF SHARPSBURG · 1,360 people · 2019 | 4/4 | SYR4 |
| Dalapon | 18.43 µg/L 9.2% of the EPA limit 200 µg/L Highest in the city: CEDAR RIDGE CHILDREN'S HOME & SCHOOL · 45 people · 2015 | 2/4 | SYR4 |
| Monochloroacetic Acid | 7.996 µg/L No EPA limit set Highest in the city: CEDAR RIDGE CHILDREN'S HOME & SCHOOL · 45 people · 2014 | 2/4 | SYR4 |
| Monobromoacetic Acid | 5.4 µg/L No EPA limit set Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2015 | 2/4 | SYR4 |
| Dibromoacetic Acid | 4.985 µg/L No EPA limit set Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2015 | 3/4 | SYR4 |
| Bromoform | 3.175 µg/L No EPA limit set Main supplier: TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM · 2,400 people · 2015
Highest in the city: 3.82 µg/L — TOWN OF SHARPSBURG · 1,360 people · 2018 | 4/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2 pCi/L 13% of the EPA limit 15 pCi/L Highest in the city: CEDAR RIDGE CHILDREN'S HOME & SCHOOL · 45 people · 2017 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.6 pCi/L 32% of the EPA limit 5 pCi/L Highest in the city: CEDAR RIDGE CHILDREN'S HOME & SCHOOL · 45 people · 2017 | 1/4 | SYR4 |
| 1,2,4-Trichlorobenzene | 0.6100 µg/L 0.9% of the EPA limit 70 µg/L Highest in the city: TOWN OF SHARPSBURG · 1,360 people · 2019 | 1/4 | SYR4 |
| Mercury | 0.5000 µg/L 25% of the EPA limit 2 µg/L Highest in the city: TOWN OF SHARPSBURG · 1,360 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0018 mg/L 12% of the EPA limit 0.0150 mg/L Highest in the city: CEDAR RIDGE CHILDREN'S HOME & SCHOOL · 45 people · 2024 | 3/4 | 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 Williamsport
| Supplier | Population served |
|---|---|
| TOWN OF WILLIAMSPORT DISTRIBUTION SYSTEM | 2,400 |
| TOWN OF SHARPSBURG | 1,360 |
| TOWN OF CLEAR SPRING | 455 |
| CEDAR RIDGE CHILDREN'S HOME & SCHOOL | 45 |
Frequently asked questions about Williamsport tap water
Is Williamsport tap water safe to drink?
EPA testing detected 20 contaminants in the water serving Williamsport. 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 Williamsport?
4 public water suppliers report drinking-water monitoring for Williamsport, Maryland to the EPA. Each is listed above with its population served.
What contaminants are in Williamsport's water?
The contaminants EPA monitoring detected in Williamsport include Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Chloroform. 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.