Coldwater Water Hardness & Quality Report (2026)
Water Hardness
13 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
558 mg/L
Est. Daily Cost
$0.59
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 Coldwater, your appliances are currently losing 30% efficiency due to mineral buildup.
| Appliance | In Coldwater | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.3 yrs | 8.5 yrs | -73% |
| Washing Machine | 5.4 yrs | 12 yrs | -55% |
| Water Heater | 6.7 yrs | 15 yrs | -55% |
Regional Water Comparison
How Coldwater compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Coldwater, Michigan | 222.5 mg/L | 12.3 ppt | 🔴 Very Hard | river |
| Battle Creek, Michigan | 121.5 mg/L | 7.2 ppt | 🟠 Hard | river |
| Sturgis, Michigan | 152.5 mg/L | 8.7 ppt | 🟠 Hard | river |
| Auburn, Indiana | 137 mg/L | 4 ppt | 🟠 Hard | river |
| Portage, Michigan | 151.5 mg/L | 8.7 ppt | 🟠 Hard | river |
National Benchmark
How Coldwater compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Coldwater | 222.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Coldwater's Water Unique?
Local geology and source profile
Coldwater, Michigan, in Branch County — the Branch County seat adjacent to Quincy and Bronson on the St. Joseph River in south-central Michigan — receives its water from the City of Coldwater Water Department, drawing from the St. Joseph River through the south-central Michigan distribution.
The very hard 222.5 mg/L hardness and high TDS of 558 mg/L reflect the Branch County St. Joseph River supply's very hard dolomitic character — the Silurian Niagaran Dolomite and Devonian Traverse Limestone are highly calcareous-dolomitic formations in the south-central Michigan Basin, and the St. Joseph River acquires substantial dissolved mineral content from its extensive dolomite drainage (compare Quincy MI: 218/548 in Branch County comparable; Bronson MI: 226/567 in Branch County comparable; Coldwater consistent very hard from the same Branch County St. Joseph River Silurian dolomitic supply). The St. Joseph River at Branch County — Silurian Niagaran Dolomite (highly dolomitic — primary hardness contributor), Devonian Traverse Limestone (highly calcareous — secondary contributor), and Quaternary St. Joseph alluvium (calcareous — TDS contributor).
At 222.5 mg/L with TDS 558, Coldwater's water is very hard — a water softener is strongly recommended to protect plumbing and appliances. The PFAS level of 12.3 ppt is very high — a certified filter with PFAS removal is strongly recommended — the Branch County Michigan industrial and agricultural legacy contributes to Coldwater's very elevated PFAS readings. Review the City of Coldwater's annual water quality report.
Geology & Source: Coldwater in Branch County draws from the Coldwater Water on the St. Joseph River (Branch County, south-central Michigan) — the St. Joseph River at Branch County drains Silurian Niagaran Dolomite (highly dolomitic) and Devonian Traverse Limestone (highly calcareous) — Michigan Branch County St. Joseph River Silurian dolomitic supply produces very hard water at 222.5 mg/L with TDS 558 mg/L.