What was found in Natick'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 | 2834.9999999999936 µg/L 28% of the EPA limit 10000 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Fluoride | 962 µg/L 24% of the EPA limit 4000 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Copper | 304.59999999999997 µg/L 23% of the EPA limit 1300 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2018 | 1/1 | SYR4 |
| TTHM | 54.275 µg/L 68% of the EPA limit 80 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Barium | 44 µg/L 2.2% of the EPA limit 2000 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 19 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 18 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Chloroform | 14 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 12.624999999999996 µg/L 21% of the EPA limit 60 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 6.7 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 4.9799999999999995 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 4.51 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Bromoform | 4.3 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 4.1 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 2.25 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Selenium | 2 µg/L 4% of the EPA limit 50 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| cis-1,2-Dichloroethylene | 1.12 µg/L 1.6% of the EPA limit 70 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2019 | 1/1 | SYR4 |
| PFOS | 0.0373 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2025 | 1/1 | UCMR-5 |
| PFOA | 0.0143 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2025 | 1/1 | UCMR-5 |
| PFHXS | 0.0112 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2025 | 1/1 | UCMR-5 |
| PFBS | 0.0065 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2025 | 1/1 | UCMR-5 |
| Pfba | 0.0050 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0035 µg/L No EPA limit set Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: NATICK WATER AND SEWER DIVISION · 37,006 people · 2025 | 1/1 | 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 Natick
| Supplier | Population served |
|---|---|
| NATICK WATER AND SEWER DIVISION | 37,006 |
Frequently asked questions about Natick tap water
Is Natick tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Natick. 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 Natick?
1 public water supplier report drinking-water monitoring for Natick, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Natick's water?
The contaminants EPA monitoring detected in Natick include Nitrate, Fluoride, Copper, TTHM, Barium. 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.