Rochester Hills Water Hardness & Quality Report (2026)
Water Hardness
13.3 grains per gallon
Source
river
pH Level
8.5
neutral = 7.0
Lead
0.008 mg/L
✓ Below action level
TDS
578.3 mg/L
Est. Daily Cost
$0.61
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 Rochester Hills, your appliances are currently losing 30% efficiency due to mineral buildup.
| Appliance | In Rochester Hills | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.1 yrs | 8.5 yrs | -75% |
| Washing Machine | 5.2 yrs | 12 yrs | -57% |
| Water Heater | 6.5 yrs | 15 yrs | -57% |
Regional Water Comparison
How Rochester Hills compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Rochester Hills, Michigan | 227.5 mg/L | 12.5 ppt | 🔴 Very Hard | river |
| Rochester, Michigan | 227.5 mg/L | 12.5 ppt | 🔴 Very Hard | river |
| Troy, Michigan | 232.5 mg/L | 12.8 ppt | 🔴 Very Hard | river |
| Auburn Hills, Michigan | 83 mg/L | 5.2 ppt | 🟡 Moderately Hard | river |
| Shelby, Michigan | 201.5 mg/L | 11.2 ppt | 🔴 Very Hard | river |
National Benchmark
How Rochester Hills compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Rochester Hills | 227.5 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Rochester Hills's Water Unique?
Local geology and source profile
Rochester Hills, Michigan, in northeast Oakland County (adjacent to Auburn Hills and Rochester, home of Oakland University), draws its municipal water supply through the City of Rochester Hills Department of Public Services Water Division, sourcing from Great Lakes Water Authority (GLWA) Lake Huron wholesale water via the Oakland County northeast distribution network. Rochester Hills is in the same northeast Oakland County GLWA service zone as Auburn Hills and Pontiac. Water hardness in Rochester Hills measures 227.5 mg/L — classified as very hard.
Rochester Hills' very hard supply reflects the northeast Oakland County GLWA distribution zone's systematically high hardness — consistent with neighboring Oakland County communities (Troy: 232.5 mg/L, Shelby Township: 201.5 mg/L). The Oakland County GLWA distribution network in the northeast quadrant incorporates significant local groundwater blending from the Silurian Niagaran Dolomite and Devonian Detroit River Group aquifers beneath the Oakland County glacial plain. Northeast Oakland County's geology — a glacial landscape over shallow calcareous Silurian dolomite — naturally produces very hard groundwater that blends with the Lake Huron GLWA supply through older service infrastructure. The systematic very-high hardness pattern in northeast Oakland County reflects both distribution infrastructure and local aquifer characteristics.
At 227.5 mg/L, Rochester Hills residents face significant hard water challenges. Scale deposits form rapidly on faucet aerators, showerheads, shower glass, and tile — monthly descaling with citric acid solution is essential maintenance. GLWA and Rochester Hills Public Services consistently deliver water meeting all Michigan EGLE and EPA Safe Drinking Water Act requirements.
Geology & Source: Mixed supply from Great Lakes Water Authority (GLWA) Lake Huron wholesale and local Oakland County groundwater via the City of Rochester Hills Department of Public Services Water Division — the northeast Oakland County GLWA distribution zone and the Silurian Niagaran Dolomite aquifer; very hard supply at 227.5 mg/L in Oakland County.