Acton Water Hardness & Quality Report (2026)
Water Hardness
3.4 grains per gallon
Source
mixed
pH Level
7.4
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
111.7 mg/L
Est. Daily Cost
$0.15
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 Acton, your appliances are currently losing 8% efficiency due to mineral buildup.
| Appliance | In Acton | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.8 yrs | 8.5 yrs | -8% |
| Washing Machine | 11 yrs | 12 yrs | -8% |
| Water Heater | 13.8 yrs | 15 yrs | -8% |
Regional Water Comparison
How Acton compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Acton, Massachusetts | 57.5 mg/L | 314.2 ppt | 🟢 Soft | mixed |
| Maynard, Massachusetts | ≈ 0–60 mg/L | 33.9 ppt | 🟢 Soft | groundwater |
| Concord, Massachusetts | 78 mg/L | 81.1 ppt | 🟡 Moderately Hard | reservoir |
| Westford, Massachusetts | 81.5 mg/L | 77.5 ppt | 🟡 Moderately Hard | mixed |
| Sudbury, Massachusetts | ≈ 180+ mg/L | 144 ppt | 🔴 Very Hard | groundwater |
National Benchmark
How Acton compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Acton | 57.5 mg/L | 🟢 None |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Acton's Water Unique?
Local geology and source profile
The Acton Water District is an independent governmental entity operating the public water supply and distribution system for Acton, Massachusetts, located in Middlesex County. The utility draws water from multiple groundwater wells, classified as groundwater under the influence of surface water. Treatment methods include air stripping, disinfection, filtration, and pre-oxidation with chlorine, with hypochlorite used as the primary disinfectant. The District operates multiple treatment plants and maintains compliance with all Safe Drinking Water Act requirements through regular contaminant testing.
Acton's water supply originates from the New England bedrock aquifer system, which underlies the Massachusetts Piedmont physiographic province. The aquifer consists primarily of metamorphic and igneous rocks — including schist, gneiss, and granite — formed during the Paleozoic Era and shaped by Pleistocene glaciation. This geological setting produces a moderately mineralised groundwater supply, with dissolved calcium and magnesium derived from weathering of feldspar and carbonate minerals within the crystalline bedrock. The slightly hard character of Acton's water is typical for New England groundwater sources in this region.
At the slightly hard level, Acton residents may experience minor scale buildup in kettles, water heaters, and dishwashers over extended periods, though the effect is generally mild. Soap and detergent efficiency is minimally affected, and most appliances operate without significant maintenance issues; periodic descaling of water heaters and coffee makers may extend equipment life. A water softener is not typically necessary. Recent water quality data (2024–2026) indicate PFAS6 levels in raw water ranging from 5 to 40 parts-per-trillion; in response to EPA's 2024 federal PFAS regulations, the District has implemented corrective actions including source disabling, multi-source blending, and long-term plans for granular activated carbon (GAC) filtration by the 2029 compliance deadline.
Geology & Source: New England bedrock aquifer — Massachusetts Piedmont metamorphic and igneous rocks (schist, gneiss, granite), Paleozoic age, shaped by Pleistocene glaciation; mineral weathering yields slightly hard groundwater
Other Massachusetts Water Reports
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Frequently Asked Questions
Is Acton's water safe to drink?
Do I need a water softener in Acton?
How does Acton compare to the USA average?
Data Sources & Methodology
Water quality data for Acton 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.