Pontiac Water Hardness & Quality Report (2026)
Water Hardness
8.5 grains per gallon
Source
river
pH Level
7.9
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
287.2 mg/L
Est. Daily Cost
$0.39
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 Pontiac, your appliances are currently losing 19% efficiency due to mineral buildup.
| Appliance | In Pontiac | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 4.8 yrs | 8.5 yrs | -44% |
| Washing Machine | 8.2 yrs | 12 yrs | -32% |
| Water Heater | 9.8 yrs | 15 yrs | -35% |
Regional Water Comparison
How Pontiac compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Pontiac, Michigan | 146 mg/L | 8.4 ppt | 🟠 Hard | river |
| Auburn Hills, Michigan | 83 mg/L | 5.2 ppt | 🟡 Moderately Hard | river |
| West Bloomfield Township, Michigan | 202.5 mg/L | 11.3 ppt | 🔴 Very Hard | river |
| Birmingham, Michigan | 188.5 mg/L | 10.6 ppt | 🔴 Very Hard | river |
| Waterford, Michigan | 160.5 mg/L | 9.2 ppt | 🟠 Hard | river |
National Benchmark
How Pontiac compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Pontiac | 146 mg/L | 🟠 Moderate |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Pontiac's Water Unique?
Local geology and source profile
Pontiac, Michigan, the Oakland County seat northwest of Detroit — a historic industrial city, one of the birthplaces of the American automobile industry (home of Pontiac Motor Company for decades), now one of Michigan's most challenged urban renewal cities — draws its municipal water supply from Lake Huron via the Great Lakes Water Authority (GLWA) and Oakland County Water Resources Commissioner, receiving Lake Huron water treated at GLWA facilities and distributed through the Oakland County system to Pontiac. Water hardness in Pontiac measures 146 mg/L — classified as moderately hard.
Pontiac's moderate hardness reflects the Oakland County Lake Huron distribution serving the inner Detroit northwest suburban ring. Lake Huron water at the GLWA treatment output carries moderate calcareous content from the Silurian Michigan Basin carbonate formations. The Pontiac distribution zone — the Oakland County seat city — has infrastructure dating from Pontiac's peak industrial period (1920s–1950s) when the Pontiac Motor Division was the major employer. The aged cast-iron and ductile-iron mains serving the dense Pontiac urban grid accumulate mineral content from the moderately hard Lake Huron source, producing the 146 mg/L moderate supply.
At 146 mg/L, Pontiac residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. GLWA and Oakland County Water Resources Commissioner consistently deliver water meeting all Michigan EGLE and EPA Safe Drinking Water Act requirements.
Geology & Source: Lake supply from Lake Huron via the Great Lakes Water Authority (GLWA) and Oakland County Water Resources Commissioner — the Oakland County suburban Lake Huron distribution serving the Detroit northwest suburban corridor; moderately hard supply at 146 mg/L in Oakland County — reflecting the aged Pontiac urban distribution infrastructure in the Oakland County inner ring.