Short answer: No measured result is above a legal limit. Boston Water and Sewer Commission (MWRA) serves 675,647 residents.
This report uses BOSTON WATER AND SEWER COMMISSION (MWRA). Your water bill or annual water quality report names your actual supplier.
Source: EPA SDWIS 2026Q2.
BOSTON WATER AND SEWER COMMISSION (MWRA) (EPA PWSID MA3035000) delivers surface water to 675,647 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. The utility's 2025 CCR reports chloramine disinfection.
1health-based violation in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
Every filing is listed; the Track record score counts at most one per contaminant per year.
Open
to Open
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
lead 5.8 µg/L, below the 15 µg/L action level (detected below the limit); 2,184 lead service lines; 265 galvanized lines to replace (context, not a tap measurement)
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Each card names which Boston findings its current certification covers, and which it doesn't.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Boston, no regulated PFAS were detected in EPA's 2024 testing; the lead 90th-percentile result was 5.8 µg/L against the 15 µg/L action level. BOSTON WATER AND SEWER COMMISSION (MWRA) (PWSID MA3035000) has a Purity Score of 74/100 (confidence: high), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
BOSTON WATER AND SEWER COMMISSION (MWRA) (PWS ID MA3035000) is the public water system on record for Boston, Massachusetts, serving about 675,647 people. Confirm the utility on your water bill before acting on a specific finding.
Surface water (primary source of record in EPA SDWIS).
None of the 29 PFAS in EPA's UCMR 5 testing (2024-01-10 to 2024-10-22) was detected. "Not detected" means below the lab's reporting limit, not proven zero.
BOSTON WATER AND SEWER COMMISSION (MWRA)'s most recent lead 90th-percentile result (2026) was 5.8 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
PurityMap's current record for Boston holds 36 findings: 6 detected within the reference and 30 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
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| Contaminant | Result | Benchmark | Sampled | Source |
|---|---|---|---|---|
| Lead (90th percentile) | 5.8 µg/L | 15 µg/L federal action level | 2026–2026 monitoring period (still open) | Lead & Copper Rule 90th-percentile: BOSTON WATER AND SEWER COMMISSION (MWRA) (MA3035000) |
| Haloacetic acids (HAA5) | 15.8 ppb | 60 ppb federal MCL | 2025 | Boston Water & Sewer Commission (MWRA) 2025 Consumer Confidence Report (CCR) |
| Total trihalomethanes (TTHM) | 16.1 ppb | 80 ppb federal MCL | 2025 | Boston Water & Sewer Commission (MWRA) 2025 Consumer Confidence Report (CCR) |
| Fluoride | 0.71 mg/L | 4.0 mg/L | 2025 | Boston Water & Sewer Commission (MWRA) 2025 Consumer Confidence Report (CCR) |
| Copper | 0.097 mg/L | 1.3 mg/L (action level) | 2025 | Boston Water & Sewer Commission (MWRA) 2025 Consumer Confidence Report (CCR) |
| Nitrate | 0.64 mg/L | 10 mg/L | 2025 | Boston Water & Sewer Commission (MWRA) 2025 Consumer Confidence Report (CCR) |
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorobutanesulfonic acid (PFBS)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorohexanoic acid (PFHxA)
Perfluorooctanesulfonic acid (PFOS)
Perfluoropentanesulfonic acid (PFPeS)
Perfluoropentanoic acid (PFPeA)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: BOSTON WATER AND SEWER COMMISSION (MWRA) (MA3035000)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: BOSTON WATER AND SEWER COMMISSION (MWRA) (MA3035000)
US EPA SDWIS
Consumer Confidence Report (CCR)
Boston Water & Sewer Commission (MWRA) 2025 Consumer Confidence Report (CCR)
Boston Water & Sewer Commission (MWRA)
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Start with the hot-or-cold tap check. Where Boston Water and Sewer Commission (MWRA) reported something related, it's shown below.
Boston disinfects with chloramine (utility water-quality report).
Lead at Boston Water and Sewer Commission (MWRA): 5.8 µg/L (90th percentile, 2026 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.
Copper: 0.097 mg/L (utility water-quality report, 2025). The federal action level is 1.3 mg/L.