What was found in Westford'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 | 2000 µg/L 20% of the EPA limit 10000 µg/L Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Fluoride | 1000 µg/L 25% of the EPA limit 4000 µg/L Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Copper | 208.45 µg/L 16% of the EPA limit 1300 µg/L Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| TTHM | 82.15 µg/L 103% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 79.013 µg/L 263% of the EPA limit, at the 95th percentile of samples — 30 µg/L Highest in the city: HAYSTACK ESTATES · 60 people · 2019 | 1/2 | SYR4 |
| Lithium | 74 µg/L No EPA limit set Highest in the city: HAYSTACK ESTATES · 60 people · 2025 | 1/2 | UCMR-5 |
| Chloroform | 46.245 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 35.525 µg/L 59% of the EPA limit 60 µg/L Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Barium | 26.3 µg/L 1.3% of the EPA limit 2000 µg/L Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 25.59 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 19.545 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 18.71 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 13.695 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 3.136 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019
Highest in the city: 5.3 µg/L — HAYSTACK ESTATES · 60 people · 2019 | 2/2 | SYR4 |
| Arsenic | 3.85 µg/L 39% of the EPA limit 10 µg/L Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 3.6285 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Bromoform | 3.628 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 2/2 | SYR4 |
| Chromium | 2.1 µg/L 2.1% of the EPA limit 100 µg/L Highest in the city: HAYSTACK ESTATES · 60 people · 2018 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.8805 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2019 | 1/2 | SYR4 |
| PFOA | 0.0086 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2023 | 2/2 | UCMR-5 |
| Pfhxa | 0.0044 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2023 | 2/2 | UCMR-5 |
| PFOS | 0.0044 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2023 | 1/2 | UCMR-5 |
| Pfpea | 0.0043 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2023 | 2/2 | UCMR-5 |
| PFBS | 0.0032 µg/L No EPA limit set Main supplier: WESTFORD WATER DEPARTMENT · 18,848 people · 2023
Highest in the city: 0.0033 µg/L — HAYSTACK ESTATES · 60 people · 2025 | 2/2 | UCMR-5 |
| Lead | 0.0029 mg/L 19% of the EPA limit 0.0150 mg/L Main supplier: WESTFORD WATER DEPARTMENT · 18,848 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 Westford
| Supplier | Population served |
|---|---|
| WESTFORD WATER DEPARTMENT | 18,848 |
| HAYSTACK ESTATES | 60 |
Frequently asked questions about Westford tap water
Is Westford tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Westford. 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 Westford?
2 public water suppliers report drinking-water monitoring for Westford, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Westford's water?
The contaminants EPA monitoring detected in Westford include Nitrate, Fluoride, Copper, TTHM, Combined Uranium. 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.