Portland Water Hardness & Quality Report (2026)
Water Hardness
3.1 grains per gallon
Source
reservoir
pH Level
7.5
neutral = 7.0
Lead
0.006 mg/L
✓ Below action level
TDS
117.9 mg/L
Est. Daily Cost
$0.14
energy & soap waste
Source: USGS Water Quality Portal · 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 Portland, your appliances are currently losing 7% efficiency due to mineral buildup.
| Appliance | In Portland | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 7.9 yrs | 8.5 yrs | -7% |
| Washing Machine | 11.7 yrs | 12 yrs | -3% |
| Water Heater | 13.5 yrs | 15 yrs | -10% |
Regional Water Comparison
How Portland compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Portland, Maine | 52.5 mg/L | 4.1 ppt | 🟢 Soft | reservoir |
| South Portland, Maine | 76.5 mg/L | 5.2 ppt | 🟡 Moderately Hard | reservoir |
| South Portland Gardens, Maine | 77 mg/L | 5.2 ppt | 🟡 Moderately Hard | reservoir |
| Westbrook, Maine | 30.5 mg/L | 3 ppt | 🟢 Soft | reservoir |
| West Scarborough, Maine | 29.5 mg/L | 3 ppt | 🟢 Soft | reservoir |
National Benchmark
How Portland compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Portland | 52.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
Bring Badger-quality water to your Portland home
Shop water softeners on Amazon.com →
What Makes Portland's Water Unique?
Local geology and source profile
Portland, Maine, the Cumberland County seat and Maine's largest city on Casco Bay — draws its municipal water supply from Sebago Lake via the Portland Water District, a multi-community water district that has supplied Sebago Lake water to Portland and surrounding communities since 1869. Sebago Lake is the second-largest freshwater lake in Maine and one of the cleanest lakes in the northeastern United States. Water hardness in Portland measures 52.5 mg/L — classified as very soft.
Portland's very soft supply reflects Sebago Lake's exceptional bedrock geology. The Sebago Lake watershed drains the Sebago Batholith — a massive Devonian–Carboniferous granitic intrusion (the Sebago Granite and related Paleozoic granitic complex of the Western Maine Highlands). Granite dissolves extremely slowly — quartz and orthoclase feldspar are highly resistant to chemical weathering — contributing very minimal dissolved calcium or magnesium to surface drainage. The Western Maine metamorphic terrain (Ordovician–Silurian Saddleback Series metasediments, schist and quartzite) surrounding the Sebago Batholith is similarly calcium-poor. The Portland Water District is famous for the exceptional purity and softness of Sebago Lake water — one of only a few large US municipal systems not requiring filtration (the PWD uses UV disinfection only for the Sebago supply).
With hardness at 52.5 mg/L, Portland residents enjoy very soft water with essentially no scale challenges. Portland Water District consistently delivers water meeting all Maine CDC and EPA Safe Drinking Water Act requirements.
Geology & Source: Reservoir supply from Sebago Lake via the Portland Water District — the Maine Lakes and Mountains Proterozoic–Paleozoic Sebago Batholith (Sebago Granite) and the Western Maine Highland metamorphic terrain; very soft supply at 52.5 mg/L — Sebago Lake is among the purest and softest public water supplies in the United States, sourced from the Sebago Granite batholith watershed.