Goodlettsville Water Hardness & Quality Report (2026)
Water Hardness
11.9 grains per gallon
Source
reservoir
pH Level
8.3
neutral = 7.0
Lead
0.007 mg/L
✓ Below action level
TDS
496.2 mg/L
Est. Daily Cost
$0.54
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 Goodlettsville, your appliances are currently losing 27% efficiency due to mineral buildup.
| Appliance | In Goodlettsville | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 2.9 yrs | 8.5 yrs | -66% |
| Washing Machine | 6.1 yrs | 12 yrs | -49% |
| Water Heater | 7.4 yrs | 15 yrs | -51% |
Regional Water Comparison
How Goodlettsville compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Goodlettsville, Tennessee | 204 mg/L | 6.9 ppt | 🔴 Very Hard | reservoir |
| Hendersonville, Tennessee | 104.5 mg/L | 3.5 ppt | 🟡 Moderately Hard | reservoir |
| Hermitage, Tennessee | 116 mg/L | 3.9 ppt | 🟡 Moderately Hard | reservoir |
| Nashville, Tennessee | 125.5 mg/L | 4.2 ppt | 🟠 Hard | reservoir |
| Mount Juliet, Tennessee | 203.5 mg/L | 6.8 ppt | 🔴 Very Hard | reservoir |
National Benchmark
How Goodlettsville compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Goodlettsville | 204 mg/L | 🔴 High |
| USA National Avg | 150 mg/L | 🟠 Moderate |
| Badger Top Rated | 8.5 mg/L | 🟢 None |
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What Makes Goodlettsville's Water Unique?
Local geology and source profile
Goodlettsville, Tennessee, in Davidson County — a Davidson County city adjacent to Madison and Hendersonville in the north Nashville metropolitan corridor — receives its municipal water from Metro Nashville Water Services, drawing from the Cumberland River via Percy Priest Lake (Davidson County) through the Metro Nashville treatment system.
The very hard 204 mg/L hardness and elevated TDS of 496.2 mg/L reflect the Nashville area Cumberland River supply's Ordovician-Mississippian carbonate character. The Cumberland River at Nashville drains the Tennessee Plateau — Ordovician Knox Group dolomite (the dominant Tennessee Valley carbonate platform), Mississippian Warsaw Limestone and St. Louis Limestone (high-purity calcite), and the Silurian Wayne Group dolomite. The Nashville Basin's Ordovician carbonate core produces the very hard metro supply.
At 204 mg/L, Goodlettsville's water is very hard — scale builds rapidly in kettles and appliances, a water softener is strongly recommended, and water heaters require annual descaling. The PFAS level of 6.9 ppt warrants a certified drinking water filter — the Davidson County Nashville industrial corridor, the Cumberland River industrial PFAS legacy (Nashville manufacturing), and the middle Tennessee PFAS background contribute to Goodlettsville's readings.
Geology & Source: Goodlettsville in Davidson County draws from Metro Nashville Water on the Cumberland River via Percy Priest Lake (Davidson County, Tennessee) — the Cumberland drains the Tennessee Plateau (Ordovician Knox dolomite, Mississippian Warsaw Limestone) — Tennessee Davidson County Cumberland River Ordovician-Mississippian carbonate watershed produces very hard water at 204 mg/L with TDS 496.2 mg/L in this Davidson County Tennessee city.