Chelmsford Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
groundwater
pH Level
7.5
neutral = 7.0
Lead
0.009 mg/L
✓ Below action level
TDS
243 mg/L
Est. Daily Cost
$0.40
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 Chelmsford, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Chelmsford | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 6.8 yrs | 8.5 yrs | -20% |
| Washing Machine | 9.6 yrs | 12 yrs | -20% |
| Water Heater | 12 yrs | 15 yrs | -20% |
Regional Water Comparison
How Chelmsford compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Chelmsford, Massachusetts | ≈ 120–179 mg/L | 124.6 ppt | 🟠 Hard | groundwater |
| Lowell, Massachusetts | ≈ 0–60 mg/L | 12.5 ppt | 🟢 Soft | reservoir |
| Westford, Massachusetts | 81.5 mg/L | 77.5 ppt | 🟡 Moderately Hard | mixed |
| Tyngsboro, Massachusetts | ≈ 0–60 mg/L | 14.3 ppt | 🟢 Soft | reservoir |
| Dracut, Massachusetts | ≈ 0–60 mg/L | 39.4 ppt | 🟢 Soft | reservoir |
National Benchmark
How Chelmsford compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Chelmsford | ≈ 120–179 mg/L | 🟠 Moderate |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
Bring Scarsdale-quality water to your Chelmsford home
Shop water softeners on Amazon.com →
What Makes Chelmsford's Water Unique?
Local geology and source profile
The Chelmsford Water District serves approximately 35,000 residents across 23 square miles in Middlesex County, Massachusetts. Water is sourced from 20 groundwater wells, including the Bomil Well Field with four gravel-packed wells and two bedrock wells in the Merrimack River Basin, recharged by Cold Spring Brook and Stony Brook. Treatment at the main plant on Watershed Lane involves air stripping, filtration, and disinfection with hypochlorite before distribution.
The supply originates within the Merrimack River watershed, where glacial deposits of sand, gravel, and till overlie fractured bedrock of the Merrimack Belt, including Devonian schists, quartzites, and igneous intrusions. Natural leaching of alkaline earth minerals from glacial limestone erratics and bedrock weathering imparts a hard character to the groundwater. This mineralized, post-glacial aquifer system yields water typical of New England valley fills, with subsurface rock-water interactions dominating the water chemistry.
Hard water leads to scale buildup in pipes, water heaters, dishwashers, washing machines, and coffee makers, where mineral deposits insulate heating elements and clog valves. Maintenance tips include installing sediment pre-filters, flushing water heaters annually, and using vinegar soaks for faucets. A water softener is recommended for households experiencing soap scum, dry skin, or appliance issues. The district reports 6 contaminants above EPA health-based guidelines, with treatment via air stripping, filtration, and hypochlorite disinfection ensuring compliance; annual Consumer Confidence Reports detail full monitoring results.
Geology & Source: Merrimack River Basin — glacial till and stratified drift aquifer over Devonian Merrimack Belt schists, quartzites, and granites; calcium and magnesium leaching from glacial limestone erratics and fractured bedrock produces hard water
Other Massachusetts 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 Chelmsford's water safe to drink?
Do I need a water softener in Chelmsford?
How does Chelmsford compare to the USA average?
Data Sources & Methodology
Water quality data for Chelmsford 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.