Coos Bay Water Hardness & Quality Report (2026)
Water Hardness
1.9 grains per gallon
Source
reservoir
pH Level
7.2
neutral = 7.0
Lead
0.003 mg/L
✓ Below action level
TDS
57.7 mg/L
Est. Daily Cost
$0.09
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 Coos Bay, your appliances are currently losing 4% efficiency due to mineral buildup.
| Appliance | In Coos Bay | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 8.5 yrs | 8.5 yrs | — |
| Washing Machine | 12.4 yrs | 12 yrs | — |
| Water Heater | 14.3 yrs | 15 yrs | -5% |
Regional Water Comparison
How Coos Bay compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Coos Bay, Oregon | 32.5 mg/L | 1.5 ppt | 🟢 Soft | reservoir |
| Roseburg, Oregon | 51 mg/L | 1.8 ppt | 🟢 Soft | reservoir |
| Grants Pass, Oregon | 65 mg/L | 2.1 ppt | 🟡 Moderately Hard | reservoir |
| Agate Beach, Oregon | 51 mg/L | 1.8 ppt | 🟢 Soft | reservoir |
| Eugene, Oregon | 40.5 mg/L | 1.6 ppt | 🟢 Soft | reservoir |
National Benchmark
How Coos Bay compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coos Bay | 32.5 mg/L | 🟢 None |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Coos Bay's Water Unique?
Local geology and source profile
Coos Bay, Oregon, in Coos County — a Coos County city adjacent to North Bend and Eastside on Coos Bay and the Pacific Coast in southwest Oregon — receives its municipal water from the Coos Bay Water Division, drawing from local reservoir sources (Coos County) in the Oregon Coast Range watershed through the Coos Bay treatment system.
The very soft 32.5 mg/L hardness and very low TDS of 57.7 mg/L reflect the Oregon Coast Range's nearly insoluble siliceous and volcanic geology — among the softest water supplies on the Pacific Coast. The Coos watershed drains the Oregon Coast Range — Eocene Tyee Formation (thick-bedded turbidite sandstone — highly insoluble siliceous), Eocene Umpqua Formation (volcanic and volcaniclastic — insoluble), and Quaternary coastal sand (insoluble siliceous). The entirely insoluble Coast Range sandstone and volcanic geology produces the very soft southwest Oregon supply.
At 32.5 mg/L, Coos Bay's water is very soft — essentially no scale forms, soap lathers abundantly, and appliances maintain excellent efficiency. Annual descaling is sufficient. The PFAS level of 1.5 ppt is very low — the Coos County southwest Oregon coast has very limited industrial PFAS sources, and the Coast Range headwaters are essentially pristine — making Coos Bay one of the cleanest PFAS readings in this dataset.
Geology & Source: Coos Bay in Coos County draws from the Coos Bay Water Division on local reservoirs (Coos County, southwest Oregon coast) — the Coos watershed drains the Oregon Coast Range (Eocene Tyee Formation sandstone, Eocene Umpqua volcanics — insoluble siliceous and volcanic) — Oregon Coos County Coast Range siliceous-volcanic watershed produces very soft water at 32.5 mg/L with TDS 57.7 mg/L in this Coos County Oregon city.