South Portland Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

7.7

neutral = 7.0

Lead

0.009 mg/L

✓ Below action level

TDS

202.5 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 Portland, your appliances are currently losing 4% efficiency due to mineral buildup.

Appliance	In South Portland	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 Portland compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ South Portland, Maine	≈ 0–59 mg/L	5.2 ppt	🟢 Soft	reservoir
Portland, Maine	≈ 0–60 mg/L	0 ppt	🟢 Soft	reservoir
South Portland Gardens, Maine	≈ 0–60 mg/L	5.2 ppt	🟢 Soft	reservoir
Westbrook, Maine	≈ 0–60 mg/L	3 ppt	🟢 Soft	groundwater
West Scarborough, Maine	≈ 0–60 mg/L	3 ppt	🟢 Soft	reservoir

National Benchmark

How South Portland compares to the USA average

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

Local geology and source profile

Source: ReservoirTDS: 202.5 mg/LpH: 7.7

South Portland Water District serves the city of South Portland in Cumberland County, Maine, providing drinking water to approximately 26,000 residents and businesses. The primary source is surface water from Sebago Lake, managed jointly with the Portland Water District via the Stroudwater and Saccarappa treatment facilities. No dedicated groundwater wells are noted for South Portland, though the shared system reflects regional mixed sourcing typical of Greater Portland. The utility maintains a distribution network spanning the urban peninsula and industrial areas, with treatment involving coagulation, sedimentation, filtration, and chloramination at shared plants to effectively remove turbidity and organics from the lake source.

The Sebago Lake watershed covers 244 square miles of forested uplands in southern Maine, protected by strict land use regulations to preserve water quality. Glacial geology dominates, with thin soils over fractured granite and schist of the Sebago Pluton (Carboniferous age), preventing significant mineral leaching. The absence of carbonate rock formations like limestone contributes to the very soft water character, with low natural buffering and minimal dissolved solids from bedrock contact. Seasonal runoff dilutes any localized mineralization, maintaining a consistently soft supply throughout the year.

Very soft water minimizes scale buildup in pipes, heaters, and appliances, reducing maintenance demands for dishwashers, washing machines, and coffee makers. Soap lathers easily without excess use, and no significant staining occurs on fixtures. A water softener is unnecessary and not recommended, as it could overly strip beneficial minerals; focus instead on corrosion prevention via pH adjustment if needed. Water quality meets all EPA standards, with pH typically 8.0–9.0 for corrosion control; lead and copper levels comply fully with no action level exceedances. No specific PFAS data was found in retrieved sources, but Maine's strict monitoring applies.

Geology & Source: Sebago Lake — Presumpscot River watershed; Sebago Pluton Complex Carboniferous granite and schist over glacial till; no limestone or dolomite — very soft; Quaternary glacial aquifers add minor mineralization

Other Maine Water Reports

Portland

≈ 0–60 mg/L

🟢 Soft

South Portland Gardens

≈ 0–60 mg/L

🟢 Soft

Westbrook

≈ 0–60 mg/L

🟢 Soft

West Scarborough

≈ 0–60 mg/L

🟢 Soft

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 Portland's water safe to drink?

Yes. South Portland'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 Portland?

South Portland'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 Portland compare to the USA average?

The USA national average is 151 mg/L. South Portland (≈ 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 Portland 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.