How does Portland's water compare to the national average?

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

Portland Water Hardness & Quality Report (2026)

Water Hardness

soft

~0–59 mg/L

Soft

estimated · not lab-verified

Source

reservoir

pH Level

6.6

neutral = 7.0

Lead

0.006 mg/L

✓ Below action level

TDS

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

Appliance	In 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 Portland compares to its nearest neighbours

City	Hardness	PFAS (ppt)	Risk	Source
▶ Portland, Maine	≈ 0–59 mg/L	0 ppt	🟢 Soft	reservoir
South Portland, Maine	≈ 0–60 mg/L	5.2 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 Portland compares to the USA average

Benchmark	Hardness	Appliance Risk
▶ 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 Portland's Water Unique?

Local geology and source profile

Source: ReservoirTDS: 117.9 mg/LpH: 6.6

The Portland Water District (PWD) serves approximately 100,000 customers across Portland, South Portland, Cape Elizabeth, and parts of Westbrook and Falmouth in Cumberland County, Maine. The primary supply is surface water from the Bull Run Reservoir in the Presumpscot River watershed, supplemented by minor groundwater. Water is treated at the Frederick E. Warren Water Treatment Plant, employing filtration, disinfection with chloramine, pH adjustment, and corrosion control.

The Bull Run watershed spans 4,500 acres of protected forest in the Sebago Lake drainage basin, with headwaters in granitic highlands. Underlying Devonian granite and schist formations from the Maine Highlands geological province dominate the watershed, forming a low-yield aquifer system. The Sebago Pluton granites are ancient, hard igneous rocks resistant to chemical weathering, contributing minimal dissolved calcium and magnesium to the water. Minimal ion exchange occurs as precipitation infiltrates thin soils over bedrock, preserving characteristically very soft water.

This soft water profile minimizes scale buildup in pipes and fixtures, reducing maintenance demands for boilers, water heaters, and dishwashers. Low hardness can slightly increase corrosion risk on metals; regular pipe inspections suffice and no water softener is recommended, as the supply poses negligible scaling issues. pH is maintained at 8.0–9.0 for corrosion control, achieving full compliance with EPA lead and copper rules. No PFAS exceedances have been reported; treatment includes coagulation, sedimentation, dual-media filtration, UV disinfection, and chloramination, with all 90+ monitored parameters meeting Safe Drinking Water Act standards per the 2024 CCR.

Geology & Source: Bull Run watershed, Sebago Lake drainage basin; Devonian granite and metamorphic schist — Sebago Pluton granites resist chemical weathering, releasing minimal calcium and magnesium; characteristically soft water with low mineral content

Other Maine Water Reports

South 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 Portland's water safe to drink?

Yes. 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 Portland?

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 Portland compare to the USA average?

The USA national average is 151 mg/L. 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 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.