How does South Windsor's water compare to the national average?

The USA national average is 151 mg/L. South Windsor (≈ 0–59 mg/L) is 121 mg/L softer than average.

South Windsor Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

groundwater

pH Level

7.1

neutral = 7.0

Lead

0.003 mg/L

✓ Below action level

TDS

157 mg/L

Est. Daily Cost

$0.08

energy & soap waste

Source: See methodology section below · Updated 2026

soft~0–59 mg/LSoft · est.

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 South Windsor, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In South Windsor	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 South Windsor compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ South Windsor, Connecticut	≈ 0–59 mg/L	6.8 ppt	🟢 Soft	groundwater
Windsor, Connecticut	≈ 120–179 mg/L	6.8 ppt	🟠 Hard	groundwater
East Hartford, Connecticut	≈ 0–60 mg/L	7.9 ppt	🟢 Soft	groundwater
Hartford, Connecticut	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir
Windsor Locks, Connecticut	≈ 120–179 mg/L	6.8 ppt	🟠 Hard	reservoir

National Benchmark

How South Windsor compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ South Windsor	≈ 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 South Windsor's Water Unique?

Local geology and source profile

Source: GroundwaterTDS: 157 mg/LpH: 7.1

South Windsor, Connecticut is served by the Metropolitan District Commission (MDC), a regional utility providing drinking water to multiple communities in the Hartford area. The MDC's supply derives entirely from surface water: the East Branch of the Farmington River and the Nepaug River, stored in the 30-billion-gallon Barkhamsted Reservoir (impounded by the Saville Dam, near New Hartford) and the 9-billion-gallon Nepaug Reservoir (created by the Phelps Brook and Nepaug Dams, near Collinsville). The MDC's watershed spans approximately 89.7 square miles across Hartford County.

The Farmington River watershed is underlain by granitic and metamorphic bedrock characteristic of central Connecticut's New England upland geology. This crystalline bedrock, combined with the surface-water nature of the supply, results in naturally soft water with minimal dissolved minerals. The geological setting does not contribute significant hardness-forming calcium and magnesium to the water, and the watershed's well-protected reservoirs show no known sources of PFAS contamination.

South Windsor residents experience soft water that requires minimal treatment for hardness-related scale. Water heaters, dishwashers, and washing machines typically accumulate minimal mineral deposits, and water softening systems are generally unnecessary. The MDC completed four rounds of EPA-required PFAS testing in 2023, detecting none of the 29 PFAS compounds; fluoride is present in the water but does not exceed the 4 ppm drinking water standard.

Geology & Source: Farmington River watershed; granitic and metamorphic bedrock of central Connecticut's New England upland — crystalline bedrock contributes minimal dissolved minerals; naturally soft surface water

Other Connecticut Water Reports

Windsor

≈ 120–179 mg/L

🟠 Hard

East Hartford

≈ 0–60 mg/L

🟢 Soft

Hartford

≈ 0–60 mg/L

🟢 Soft

Windsor Locks

≈ 120–179 mg/L

🟠 Hard

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 South Windsor's water safe to drink?

Yes. South Windsor's water meets all federal safety standards. The hardness is ≈ 0–59 mg/L (Soft), which is safe to drink. High hardness affects appliances and taste, but poses no health risk.

Do I need a water softener in South Windsor?

South Windsor's water is soft at ≈ 0–59 mg/L. A water softener is generally not necessary, though a carbon filter can improve taste and remove any remaining chlorine.

How does South Windsor compare to the USA average?

The USA national average is 151 mg/L. South Windsor (≈ 0–59 mg/L) is 121 mg/L below the national average. The softest major city is Scarsdale at just 0.02 mg/L.

Data Sources & Methodology

Water quality data for South Windsor is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.

Estimated

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.

Estimated

Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.

Estimated

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.

Measured

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.

Modelled

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.

Calculated

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.