Drinking water quality
What's in Boston, MA tap water
7 contaminants were measured in the Boston, MA water system's most recent annual report. Each is shown below against its federal limit.
Disinfectants
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Chloramine | 0.04–3.85 mg/LRange | 4 mg/LMCL | Approaching the limit |
Disinfection byproducts
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| HAA5 | 4.4–24.9 ug/LRange | 60 ug/LMCL | Within the limit |
| TTHM | 26.3 ug/LAverage | 80 ug/LMCL | Within the limit |
Inorganic chemicals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Fluoride | 0.33–0.77 mg/LRange | 4 mg/LMCL | Within the limit |
| Nitrate | 0.62 mg/LAverage | 10 mg/LMCL | Within the limit |
Metals
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Barium | 0.008–0.009 mg/LRange | 2 mg/LMCL | Within the limit |
Radionuclides
| Contaminant | Measured | Federal limit | Status |
|---|---|---|---|
| Combined Radium | 0.82 pCi/LAverage | 5 pCi/LMCL | Within the limit |
Every figure here is transcribed verbatim from Boston, MA's annual Consumer Confidence Report, cross-checked by a second model, and approved by a person before publishing. Numbers are the utility's own — a water-quality report covers an entire service area, not a single address.