Mariners Harbor Water Hardness & Quality Report (2026)
Water Hardness
9.3 grains per gallon
Source
reservoir
pH Level
8.1
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
400.6 mg/L
Est. Daily Cost
$0.43
energy & soap waste
Source: USGS Water Quality Portal · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Mariners Harbor, your appliances are currently losing 21% efficiency due to mineral buildup.
| Appliance | In Mariners Harbor | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.3 yrs | 8.5 yrs | -49% |
| Washing Machine | 7.7 yrs | 12 yrs | -36% |
| Water Heater | 9.2 yrs | 15 yrs | -39% |
Regional Water Comparison
How Mariners Harbor compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mariners Harbor, New York | 160 mg/L | 7.7 ppt | 🟠 Hard | reservoir |
| Graniteville, New York | 79 mg/L | 3.9 ppt | 🟡 Moderately Hard | reservoir |
| Port Richmond, New York | 82.5 mg/L | 4.1 ppt | 🟡 Moderately Hard | reservoir |
| New Springville, New York | 158.5 mg/L | 7.6 ppt | 🟠 Hard | reservoir |
| Bayonne, New Jersey | 183.5 mg/L | 13.2 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Mariners Harbor compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mariners Harbor | 160 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Mariners Harbor's Water Unique?
Local geology and source profile
Mariners Harbor, New York, in Richmond County (Staten Island) — a North Shore Staten Island neighborhood on Staten Island at Kill Van Kull — receives its municipal water from NYC DEP, which distributes the Catskill-Delaware Reservoir supply to Staten Island through the Richmond Tunnel and the Staten Island distribution system.
The moderately hard 160 mg/L hardness and TDS of 400.6 mg/L — substantially harder than Catskill-Delaware raw water (typically ~15-30 mg/L) — reflect the NYC DEP corrosion control treatment effect throughout the five boroughs. As noted for Brooklyn Heights and Charlestown, NYC DEP adds lime (calcium hydroxide) and sodium hydroxide to raise alkalinity and pH for lead/copper rule compliance throughout the distribution system, raising finished water hardness to approximately 130-170 mg/L across all boroughs. Mariners Harbor's Staten Island reading (160 mg/L) is consistent with the expected treated NYC DEP supply range.
At 160 mg/L, Mariners Harbor's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 7.7 ppt warrants a certified drinking water filter — the Kill Van Kull / Arthur Kill industrial waterway (one of the most industrialized waterways in the US), Bayonne industrial complex, the Staten Island former Fresh Kills Landfill (one of the world's largest landfills — PFAS leachate), and the NYC-NJ industrial harbor PFAS complex contribute to Mariners Harbor's elevated readings.
Geology & Source: Mariners Harbor in Richmond County (Staten Island) is served by NYC DEP on the Catskill-Delaware Reservoir system — the Catskill-Delaware watersheds drain Devonian-Silurian shale and sandstone terrain — NYC Catskill-Delaware watershed drainage with MWRA-like corrosion control treatment produces moderately hard water at 160 mg/L with TDS 401 mg/L in this Staten Island New York neighborhood.