Head-to-head water quality
Boston, MA vs Smithtown (T), NY
Side-by-side water quality comparison: Boston (Grade B) vs Smithtown (T) (Grade A-). Lead, PFAS, violations, and source-water contamination
Score breakdown
Each factor is shown as raw points (out of the maximum). Higher = better.
Factor
Boston
Smithtown (T)
Better
Violations subscore / 45
42.8
43.3
Smithtown (T)
Lead/Copper subscore / 20
6.0
20.0
Smithtown (T)
Contaminant subscore / 20
19.0
8.8
Boston
Compliance subscore / 10
5.0
8.0
Smithtown (T)
Source subscore / 5
4.0
5.0
Smithtown (T)
Lead & copper at the tap
Lead and Copper Rule (LCR) 90th-percentile readings — the value that 10% of sampled homes exceed.
Factor
Boston
Smithtown (T)
Better
Lead 90th-percentile (latest) · EPA action level: 15 µg/L
0.0 µg/L
0.0 µg/L
Smithtown (T)
Copper 90th-percentile (latest) · EPA action level: 1.3 mg/L
—
—
—
PFAS — "forever chemicals"
UCMR 5 testing, 2023–2025. Federal MCLs: PFOA + PFOS = 4 ng/L; HFPO-DA = 10 ng/L.
Factor
Boston
Smithtown (T)
Better
PFAS analytes detected
0 of 30
10 of 30
Boston
PFAS exceeds federal MCL
No
Yes
Boston
PFAS hazard index · Sum of (max/MCL) across detected analytes; > 1 indicates exceedance
—
5.97
Smithtown (T)
Violation history
SDWA enforcement actions — fewer is better.
Factor
Boston
Smithtown (T)
Better
Violations (last 5 years)
0
0
Tie
Health-based violations (total)
5
3
Smithtown (T)
Unresolved violations
3
1
Smithtown (T)
Other contaminants tested
UCMR rounds 1–4 + UCMR 5 lithium. Maxima where data exists; "—" means not tested.
Factor
Boston
Smithtown (T)
Better
Chromium-6 (max)
—
5.59 µg/L
Smithtown (T)
HAA5 (avg)
15.35 µg/L
0.80 µg/L
Smithtown (T)
Manganese (max)
10.90 µg/L
176.80 µg/L
Boston
Strontium (max)
39.40 µg/L
169.00 µg/L
Boston
1,4-Dioxane (max)
—
4.34 µg/L
Smithtown (T)
NDMA (max)
3.88 ng/L
13.43 ng/L
Boston
Perchlorate (max)
—
12.10 µg/L
Smithtown (T)
Vanadium (max)
—
6.97 µg/L
Smithtown (T)
Chlorate (max)
220.00 µg/L
386.00 µg/L
Boston
Molybdenum (max)
—
1.18 µg/L
Smithtown (T)
Industrial proximity
Superfund National Priorities List + Toxic Release Inventory facilities within 10 miles of the city centroid.
Factor
Boston
Smithtown (T)
Better
Superfund sites within 10 mi
1
0
Smithtown (T)
TRI lbs to surface water within 10 mi (2023)
55
0
Smithtown (T)
System size & source
Factor
Boston
Smithtown (T)
Population served
3.3M
1.1M
—
Water source
Surface water
Groundwater
—
Number of water systems
2
1
—
See the full reports
Frequently asked
Which has better water — Boston or Smithtown (T)?
Smithtown (T), NY scores higher (85.1 vs 76.8) on WaterVerge's 100-point methodology, earning a Grade A- compared to Boston's Grade B. The score combines violation history, lead and copper levels, contaminant testing, monitoring compliance, and source-water type.
How is the WaterVerge water quality score calculated?
The grade combines five subscores: violation history (45 pts, weighted by recency and health-based severity), lead/copper 90th-percentile vs EPA action levels (20 pts), contaminant testing including PFAS, chromium-6, HAA5, NDMA, perchlorate, and Superfund/TRI proximity (20 pts), monitoring compliance (10 pts), and water-source-type risk (5 pts). Full methodology at /about/methodology.
Where does this water quality data come from?
From the EPA's public records: the SDWIS bulk download (violations + system info), UCMR rounds 1–5 (unregulated contaminant testing including PFAS, chromium-6, HAA5, NDMA, perchlorate, vanadium, lithium), the EPA Toxic Release Inventory (industrial polluters), the Superfund National Priorities List, the USGS Powell Domestic-Well Database (private-well chemistry), and the CDC Community Water Fluoridation system. Data is refreshed quarterly.