Mariners Harbor Water Hardness & Quality Report (2026)
Water Hardness
1.8 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
$0.08
energy & soap waste
Source: See methodology section below · 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 4% efficiency due to mineral buildup.
| Appliance | In Mariners Harbor | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.6 yrs | 8.5 yrs | — |
| Washing Machine | 12.5 yrs | 12 yrs | — |
| Water Heater | 14.4 yrs | 15 yrs | -4% |
Regional Water Comparison
How Mariners Harbor compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Mariners Harbor, New York | 31 mg/L | 7.7 ppt | 🟢 Soft | reservoir |
| Graniteville, New York | ≈ 120–179 mg/L | 3.9 ppt | 🟠 Hard | reservoir |
| Port Richmond, New York | ≈ 120–179 mg/L | 4.1 ppt | 🟠 Hard | reservoir |
| New Springville, New York | ≈ 120–179 mg/L | 7.6 ppt | 🟠 Hard | reservoir |
| Bayonne, New Jersey | ≈ 120–179 mg/L | 13.2 ppt | 🟠 Hard | reservoir |
National Benchmark
How Mariners Harbor compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Mariners Harbor | 31 mg/L | 🟢 None |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
Bring Scarsdale-quality water to your Mariners Harbor home
Shop water softeners on Amazon.com →
What Makes Mariners Harbor's Water Unique?
Local geology and source profile
Mariners Harbor is served by the New York City Department of Environmental Protection (DEP). Water is supplied from two primary sources: the Catskill/Delaware watershed, encompassing upstate reservoirs including the Delaware and Ashokan systems, and the Croton watershed, fed by reservoirs north of the city. Both systems feed treatment plants that serve all five boroughs, including Staten Island. The utility does not publish neighborhood-level hardness data, and citywide averages are applied to the supply reaching Mariners Harbor residents.
The Catskill/Delaware watershed drains Paleozoic sedimentary formations of the Appalachian plateau, including sandstones and shales with low mineral content, producing soft water. The Croton system flows through Precambrian metamorphic bedrock and Paleozoic limestone and shale, yielding moderately mineralized water. Mariners Harbor may receive either source or a blend depending on seasonal demand and system operations; the blended supply is characterized as soft to moderately hard, with low overall dissolved mineral content.
At this softness level, residents experience minimal scale buildup in appliances, with excellent soap and detergent performance and low maintenance demands on water heaters and dishwashers. A water softener is generally not necessary. Plumbing corrosion is the primary concern with soft water; NYC adds orthophosphate to inhibit lead and copper leaching from pipes. The supply is fluoridated at approximately 0.7 mg/L, pH is neutral to slightly alkaline, and no PFAS contamination has been reported in NYC's primary water supplies. Treatment includes filtration, UV disinfection, and chlorination.
Geology & Source: Catskill/Delaware watershed — Paleozoic sandstones and shales of the Appalachian plateau; Croton watershed — Precambrian metamorphic bedrock and Paleozoic formations; blended supply yields soft, low-mineral water
Other New York Water Reports
Report an Issue
Notice an error or missing data? Help us keep this page accurate. If you spot incorrect water hardness, outdated utility info, or missing details, please let us know.
All reports are reviewed by our team. Thank you for supporting data quality!
Frequently Asked Questions
Is Mariners Harbor's water safe to drink?
Do I need a water softener in Mariners Harbor?
How does Mariners Harbor compare to the USA average?
Data Sources & Methodology
Water quality data for Mariners Harbor is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.