Oxford Water Hardness & Quality Report (2026)
Water Hardness
~120–179 mg/L
Hardestimated · not lab-verified
Source
reservoir
pH Level
7.8
neutral = 7.0
Lead
0.002 mg/L
✓ Below action level
TDS
182 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 Oxford, your appliances are currently losing 20% efficiency due to mineral buildup.
| Appliance | In Oxford | 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 Oxford compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Oxford, Connecticut | ≈ 120–179 mg/L | 5.2 ppt | 🟠 Hard | reservoir |
| Seymour, Connecticut | ≈ 120–179 mg/L | 5.2 ppt | 🟠 Hard | groundwater |
| Naugatuck, Connecticut | ≈ 120–179 mg/L | 9.9 ppt | 🟠 Hard | groundwater |
| Ansonia, Connecticut | ≈ 120–179 mg/L | 5.5 ppt | 🟠 Hard | reservoir |
| Southbury, Connecticut | ≈ 120–179 mg/L | 6.8 ppt | 🟠 Hard | groundwater |
National Benchmark
How Oxford compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Oxford | ≈ 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 Oxford home
Shop water softeners on Amazon.com →
What Makes Oxford's Water Unique?
Local geology and source profile
Oxford Water supplies approximately 13,000 residents in Oxford, New Haven County, Connecticut, drawing from multiple groundwater wells. These wells tap local aquifers, including the Oxford Wellfield, within stratified drift deposits. All water is treated at the Oxford Water Treatment Plant, undergoing disinfection, filtration, and corrosion control. The system is entirely groundwater-based, with no surface water sources like reservoirs or rivers, and no reliance on water purchased from other utilities such as Aquarion. The watershed comprises local groundwater recharge areas within tributaries of the Housatonic River Basin, specifically draining to the Little River and Naugatuck River sub-basins.
The water originates from groundwater sources beneath the Berkshire Highlands, a region characterized by metamorphic bedrock formations including schist, gneiss, and marble from the Cambro-Ordovician period. These bedrock layers are covered by Quaternary glacial till and outwash sands. This geological makeup causes the water to leach minerals like calcium and magnesium from carbonate-rich rocks and glacial deposits. Consequently, the groundwater in Oxford develops a moderately mineralized character, typical of hard groundwater found in Connecticut's upland areas.
This moderately hard water can lead to scale buildup in appliances such as water heaters and dishwashers, potentially reducing their efficiency and increasing energy consumption. You might notice that soap doesn't lather as readily, requiring more detergent for effective cleaning. Homeowners may find periodic descaling of fixtures and appliances necessary. To extend the lifespan of appliances and improve laundry results, especially if you notice spotting on dishes, installing a water softener is often recommended. Oxford Water reported compliance with all EPA standards for 2024, with testing showing levels below maximum contaminant levels for microbiological contaminants, nitrates, and inorganics, though one unspecified exceedance occurred in May 2024.
Geology & Source: Western Uplands stratified-drift aquifers; fractured Cambrian-Ordovician metamorphic rocks (Rowe Schist, gneiss, quartzite, marble) contribute moderate hardness from carbonate lenses and glacial till.
Other Connecticut 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 Oxford's water safe to drink?
Do I need a water softener in Oxford?
How does Oxford compare to the USA average?
Data Sources & Methodology
Water quality data for Oxford 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.