What was found in ZIP 01748
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 2400 µg/L 24% of the EPA limit 10000 µg/L Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019
Highest in the ZIP: 4300 µg/L — THE PRESERVE AT HOPKINTON CONDO · 80 people · 2019 | 5/6 | SYR4 |
| Fluoride | 200 µg/L 5% of the EPA limit 4000 µg/L Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2018
Highest in the ZIP: 2355 µg/L — MAILLET WOODS CONDOMINIUMS · 55 people · 2018 | 4/6 | SYR4 |
| Copper | 262.66 µg/L 20% of the EPA limit 1300 µg/L Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2018 | 4/6 | SYR4 |
| Toluene | 103 µg/L 10% of the EPA limit 1000 µg/L Highest in the ZIP: ESTATES AT HIGHLAND RIDGE · 100 people · 2019 | 2/6 | SYR4 |
| TTHM | 72.3 µg/L 90% of the EPA limit 80 µg/L Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Chloroform | 38.8 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Combined Uranium | 24.365 µg/L 81% of the EPA limit 30 µg/L Highest in the ZIP: ESTATES AT HIGHLAND RIDGE · 100 people · 2019 | 3/6 | SYR4 |
| Barium | 17.6 µg/L 0.9% of the EPA limit 2000 µg/L Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2018 | 4/6 | SYR4 |
| Bromodichloromethane | 17.4 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 13.4 µg/L 22% of the EPA limit 60 µg/L Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Trichloroacetic Acid | 9 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 6.32 µg/L 105% of the EPA limit, at the 95th percentile of samples — 6 µg/L Highest in the ZIP: MAILLET WOODS CONDOMINIUMS · 55 people · 2018 | 1/6 | SYR4 |
| Dibromochloromethane | 5.62 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Dibromoacetic Acid | 2.4275 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Monochloroacetic Acid | 1.979 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Dichloroacetic Acid | 1.95 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Bromoform | 1.85 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Trichloroethylene | 1.325 µg/L 27% of the EPA limit 5 µg/L Highest in the ZIP: ESTATES AT HIGHLAND RIDGE · 100 people · 2019 | 1/6 | SYR4 |
| Asbestos | 0.7800 MFL 11% of the EPA limit 7 MFL Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2012 | 1/6 | SYR4 |
| Monobromoacetic Acid | 0.7600 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| 2,4-D | 0.1580 µg/L 0.2% of the EPA limit 70 µg/L Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2019 | 1/6 | SYR4 |
| Lead | 0.0074 mg/L 49% of the EPA limit 0.0150 mg/L Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2025
Highest in the ZIP: 0.0130 mg/L — DEERFIELD ESTATES · 100 people · 2025 | 6/6 | LCR |
| PFOA | 0.0072 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2025 | 1/6 | UCMR-5 |
| Pfba | 0.0062 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2025 | 1/6 | UCMR-5 |
| Pfpea | 0.0058 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2025 | 1/6 | UCMR-5 |
| PFBS | 0.0055 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2025 | 1/6 | UCMR-5 |
| Pfhxa | 0.0046 µg/L No EPA limit set Main supplier: HOPKINTON WATER DEPARTMENT · 12,680 people · 2025 | 1/6 | 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.
Water suppliers serving ZIP 01748
| Supplier | State | Population served |
|---|---|---|
| HOPKINTON WATER DEPARTMENT | MA | 12,680 |
| DEERFIELD ESTATES | MA | 100 |
| ESTATES AT HIGHLAND RIDGE | MA | 100 |
| THE PRESERVE AT HOPKINTON CONDO | MA | 80 |
| MAILLET WOODS CONDOMINIUMS | MA | 55 |
| VILLAGE AT HIGHLAND PARK | MA | 50 |
Frequently asked questions about ZIP 01748 tap water
Is the tap water in ZIP 01748 safe to drink?
EPA testing detected 27 contaminants across the water suppliers serving ZIP 01748. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 01748?
6 public water suppliers report EPA drinking-water monitoring for ZIP 01748. Each is listed above with its population served.
What contaminants are in ZIP 01748's water?
EPA monitoring detected Nitrate, Fluoride, Copper, Toluene, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.