Yarmouth Water Hardness & Quality Report (2026)
Water Hardness
~0–59 mg/L
Softestimated · not lab-verified
Source
groundwater
pH Level
7.2
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
41.4 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 Yarmouth, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Yarmouth | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.2 yrs | 8.5 yrs | -4% |
| Washing Machine | 11.5 yrs | 12 yrs | -4% |
| Water Heater | 14.4 yrs | 15 yrs | -4% |
Regional Water Comparison
How Yarmouth compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Yarmouth, Massachusetts | ≈ 0–59 mg/L | 219.1 ppt | 🟢 Soft | groundwater |
| South Yarmouth, Massachusetts | ≈ 0–60 mg/L | 6.1 ppt | 🟢 Soft | groundwater |
| Barnstable, Massachusetts | ≈ 0–60 mg/L | 69.6 ppt | 🟢 Soft | groundwater |
| Hyannis, Massachusetts | ≈ 0–60 mg/L | 107.8 ppt | 🟢 Soft | groundwater |
| Harwich, Massachusetts | ≈ 0–60 mg/L | 0 ppt | 🟢 Soft | groundwater |
National Benchmark
How Yarmouth compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Yarmouth | ≈ 0–59 mg/L | 🟢 None |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Yarmouth's Water Unique?
Local geology and source profile
The Yarmouth Water Department serves the Town of Yarmouth, Massachusetts, located in Barnstable County on Cape Cod. The utility draws drinking water from 24 groundwater wells tapping local aquifers, with no surface water reservoirs or rivers used. Treatment is minimal given the high natural quality of the sources, with no disinfectant added. The service area covers West Yarmouth and surrounding communities, with the main office at 99 Buck Island Rd, West Yarmouth, MA 02673. Water & Wastewater Superintendent Laurie Ruszala can be reached at 508-771-7921 or lruszala@yarmouth.ma.us.
The watershed consists of recharge areas across Cape Cod's sandy outwash plains, feeding the Sagamore and Monomoy aquifers. These are unconfined to semi-confined sandy gravel formations formed during the Pleistocene epoch, overlying weathered Cretaceous-age sandstones and shales. Rainwater percolates quickly through inert quartz sands with little dissolution of hardness-causing minerals, resulting in naturally very soft water with low dissolved mineral content. The area's minimal karst development and low weathering of mafic minerals further contribute to the soft character of the groundwater throughout the region.
With naturally very soft water, scale buildup is negligible, protecting water heaters, dishwashers, and washing machines from mineral deposits. Soap lathers easily, reducing product usage, and fixtures rarely show spots or films. No special maintenance is needed beyond standard cleaning, and a water softener is not recommended as it could over-soften the supply and potentially lead to corrosion issues in pipes. Water quality meets all EPA and Massachusetts standards per the 2024 Drinking Water Quality Report; PFAS6 levels are below the state MCL of 20 ppt across all active sources, with quarterly monitoring in place.
Geology & Source: Cape Cod Pleistocene glacial outwash — Sagamore and Monomoy aquifers; unconsolidated quartz sands and gravels overlying Cretaceous-age bedrock; minimal carbonate contact yields naturally very soft, low-mineral groundwater
Other Massachusetts Water Reports
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Frequently Asked Questions
Is Yarmouth's water safe to drink?
Do I need a water softener in Yarmouth?
How does Yarmouth compare to the USA average?
Data Sources & Methodology
Water quality data for Yarmouth 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.